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Title: A study of the energy dependence of the underlying event in proton-antiproton collisions

Abstract

We study charged particle production (pT > 0.5 GeV/c, |η| < 0.8) in proton-antiproton collisions at total center-of-mass energies s=300 GeV, 900 GeV, and 1.96 TeV. We use the direction of the charged particle with the largest transverse momentum in each event to define three regions of η-φ space: "toward", "away", and "transverse." The average number and the average scalar pT sum of charged particles in the transverse region are sensitive to the modeling of the "underlying event." The transverse region is divided into a MAX and MIN transverse region, which helps separate the "hard component" (initial and final-state radiation) from the "beam-beam remnant" and multiple parton interaction components of the scattering. The center-of-mass energy dependence of the various components of the event is studied in detail. The data presented here can be used to constrain and improve QCD Monte Carlo models, resulting in more precise predictions at the LHC energies of 13 and 14 TeV.

Authors:
 [1]
  1. Univ. of Helsinki, Helsinki (Finland). et al.
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Org.:
CDF Collaboration
OSTI Identifier:
1221350
Alternate Identifier(s):
OSTI ID: 1227043; OSTI ID: 1454442
Report Number(s):
FERMILAB-PUB-15-361-E
Journal ID: ISSN 1550-7998; PRVDAQ; arXiv eprint number arXiv:1508.05340; TRN: US1600882
Grant/Contract Number:  
AC02-07CH11359; AC02-06CH11357; AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review. D, Particles, Fields, Gravitation and Cosmology
Additional Journal Information:
Journal Volume: 92; Journal Issue: 09; Journal ID: ISSN 1550-7998
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Aaltonen, T. A study of the energy dependence of the underlying event in proton-antiproton collisions. United States: N. p., 2015. Web. https://doi.org/10.1103/PhysRevD.92.092009.
Aaltonen, T. A study of the energy dependence of the underlying event in proton-antiproton collisions. United States. https://doi.org/10.1103/PhysRevD.92.092009
Aaltonen, T. Mon . "A study of the energy dependence of the underlying event in proton-antiproton collisions". United States. https://doi.org/10.1103/PhysRevD.92.092009. https://www.osti.gov/servlets/purl/1221350.
@article{osti_1221350,
title = {A study of the energy dependence of the underlying event in proton-antiproton collisions},
author = {Aaltonen, T.},
abstractNote = {We study charged particle production (pT > 0.5 GeV/c, |η| < 0.8) in proton-antiproton collisions at total center-of-mass energies s=300 GeV, 900 GeV, and 1.96 TeV. We use the direction of the charged particle with the largest transverse momentum in each event to define three regions of η-φ space: "toward", "away", and "transverse." The average number and the average scalar pT sum of charged particles in the transverse region are sensitive to the modeling of the "underlying event." The transverse region is divided into a MAX and MIN transverse region, which helps separate the "hard component" (initial and final-state radiation) from the "beam-beam remnant" and multiple parton interaction components of the scattering. The center-of-mass energy dependence of the various components of the event is studied in detail. The data presented here can be used to constrain and improve QCD Monte Carlo models, resulting in more precise predictions at the LHC energies of 13 and 14 TeV.},
doi = {10.1103/PhysRevD.92.092009},
journal = {Physical Review. D, Particles, Fields, Gravitation and Cosmology},
number = 09,
volume = 92,
place = {United States},
year = {2015},
month = {11}
}

Journal Article:

Figures / Tables:

Figure 1 Figure 1: Illustration of the regions of $η$-$\phi$ space that are defined relative to the direction of a “leading object” in the event. The “leading object” can be the highest $p$T charged particle (left), the highest $p$T charged-particle or calorimeter jet (middle), or the lepton-pair in $Z$-boson production (right). Themore » relative azimuthal angle $Δ\phi$ = $\phi$ – $\phi_{L}$, where $\phi_{L}$ is the azimuthal angle of the leading object and $\phi$ is the azimuthal angle of a charged particle. The “toward” region is defined by |$Δ\phi$ | < 60° and |$η$| < $η$cut, while the “away” region is |$Δ\phi$ | > 120° and |$η$| < $η$cut. The two “transverse” regions -120° < $Δ\phi$ < -60°, |$η$| < $η$cut and 60° < $Δ\phi$ < 120°, |$η$| < $η$cut are referred to as “transverse 1” and “transverse 2”.« less

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font-size:0.75rem;"><br/> <span class="type">text</span>, <span class="date" data-date="2016-01-01">January 2016</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A.</span> </li> <li> Springer Verlag</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.5445/ir/1000053991" class="text-muted" target="_blank" rel="noopener noreferrer">10.5445/ir/1000053991<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.1140/epjc/s10052-016-3988-x" target="_blank" rel="noopener noreferrer" class="name">Event generator tunes obtained from underlying event and multiparton scattering measurements<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">journal</span>, <span class="date" data-date="2016-03-01">March 2016</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A.</span> </li> <li> The European Physical Journal C, Vol. 76, Issue 3</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1140/epjc/s10052-016-3988-x" class="text-muted" target="_blank" rel="noopener noreferrer">10.1140/epjc/s10052-016-3988-x<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> </ul> <hr/> </div> </div> <div class="pagination-container small"> <a class="pure-button prev page" href="#" rel="prev"><span class="fa fa-angle-left"></span></a><ul class="pagination d-inline-block" style="padding-left:.2em;"></ul><a class="pure-button next page" href="#" rel="next"><span class="fa fa-angle-right"></span></a> </div> </div> </div> <div class="col-sm-3 order-sm-3"> <ul class="nav nav-stacked"> <li class="active"><a href="" class="reference-type-filter tab-nav" data-filter="type" data-pattern="*"><span class="fa fa-angle-right"></span> All Cited By</a></li> <li class="small" style="margin-left:.75em; text-transform:capitalize;"><a href="" class="reference-type-filter tab-nav" data-filter="type" data-pattern="journal"><span class="fa fa-angle-right"></span> journal<small class="text-muted"> (2)</small></a></li> <li class="small" style="margin-left:.75em; text-transform:capitalize;"><a href="" class="reference-type-filter tab-nav" data-filter="type" data-pattern="text"><span class="fa fa-angle-right"></span> text<small class="text-muted"> (1)</small></a></li> </ul> <div style="margin-top:2em;"> <form class="pure-form small text-muted citation-search"> <label for="citation-search-text" class="sr-only">Search</label> <input class="search form-control pure-input-1" id="citation-search-text" placeholder="Search" style="margin-bottom:10px;" /> <fieldset> <div style="margin-left:1em; font-weight:normal; line-height: 1.6em;"><input type="radio" class="sort" name="references-sort" data-sort="name" style="position:relative;top:2px;" id="citation-search-sort-name"><label for="citation-search-sort-name" style="margin-left: .3em;">Sort by title</label></div> <div style="margin-left:1em; font-weight:normal; line-height: 1.6em;"><input type="radio" class="sort" name="references-sort" data-sort="date" data-order="desc" style="position:relative;top:2px;" id="citation-search-sort-date"><label for="citation-search-sort-date" style="margin-left: .3em;">Sort by date</label></div> </fieldset> <div class="text-left" style="margin-left:1em;"> <a href="" class="filter-clear clearfix" title="Clear filter / sort" style="font-weight:normal; float:none;">[ × clear filter / sort ]</a> </div> </form> </div> </div> </div> </section> <section id="biblio-images" class="tab-content tab-content-sec osti-curated" data-tab="biblio"> <div class="row"> <div class="col-sm-9 order-sm-9"> <div class="padding"> <p class="lead text-muted" style="font-size: 18px; margin-top:0px;"><span id="image-type-label">Figures / Tables</span> found in this record:</p> <div class="list clearfix"> <div class="col-sm-3 float-left biblio-image-tile" data-apporder="p. 5" data-order="1" data-imgid="1221350-img78695" data-imgsrc="/biblio/1221350/image/001/083/0010830/4/0078695.png" data-title="Figure 1" data-desc="Illustration of the regions of $η$-$\phi$ space that are defined relative to the direction of a “leading object” in the event. The “leading object” can be the highest $p$T charged particle (left), the highest $p$T charged-particle or calorimeter jet (middle), or the lepton-pair in $Z$-boson production (right). The relative azimuthal angle $Δ\phi$ = $\phi$ – $\phi_{L}$, where $\phi_{L}$ is the azimuthal angle of the leading object and $\phi$ is the azimuthal angle of a charged particle. The “toward” region is defined by |$Δ\phi$ | < 60° and |$η$| < $η$cut, while the “away” region is |$Δ\phi$ | > 120° and |$η$| < $η$cut. The two “transverse” regions -120° < $Δ\phi$ < -60°, |$η$| < $η$cut and 60° < $Δ\phi$ < 120°, |$η$| < $η$cut are referred to as “transverse 1” and “transverse 2”." data-ostiid="1221350" style="padding-bottom: 2em; border-bottom: 1px solid #ddd;"> <a href="#img" class="biblio-image-tile-a ga-click-event" data-imgid="1221350-img78695" data-lityx data-category="Extracted Images" data-label="biblio: image thumbnail" data-value="1221350-img78695"> <div style=" padding: .5em; border: 1px solid #eee; background-color: #fff; "> <small class="name">Figure 1 <small class="pull-right" style="margin-right: .5em;color:#999;top: 3px;position: relative;">(p. 5)</small><span class="d-none type">figure</span></small> <div style=" background-image:url('/biblio/1221350/image/001/083/0010830/4/t0078695.png'); background-repeat:no-repeat; background-size:contain; background-position-x: center; width: 100%; height: 175px; margin-top:.5em; "> </div> </div> </a> </div> <div class="col-sm-3 float-left biblio-image-tile" data-apporder="p. 6" data-order="2" data-imgid="1221350-img78677" data-imgsrc="/biblio/1221350/image/001/083/0010830/4/0078677.png" data-title="Figure 2" data-desc="(A) Illustration of the regions of $η$-$\phi$ space that are defined relative to the direction of the highest $p$T charged particle (i.e., leading charged particle). The relative angle $Δ\phi$ = $\phi$ – $\phi_{MAX}$, where $\phi_{MAX}$is the azimuthal angle of the leading charged particle and $\phi$ is the azimuthal angle of a charged particle. On an event by event basis, we define “transMAX” (“transMIN”) to be the maximum (minimum) number or scalar $p$T sum of charged particles in the two transverse regions “transverse 1” and “transverse 2” shown in Fig. 1. (B) Illustration of the topology of a hadron-hadron collision in which a hard parton-parton collision has occurred. For events with large initial or finalstate radiation the transMAX region contains the third jet, while both the transMAX and transMIN regions receive contributions from the multiple parton interactions (MPI) and the beam-beam remnants (BBR)." data-ostiid="1221350" style="padding-bottom: 2em; border-bottom: 1px solid #ddd;"> <a href="#img" class="biblio-image-tile-a ga-click-event" data-imgid="1221350-img78677" data-lityx data-category="Extracted Images" data-label="biblio: image thumbnail" data-value="1221350-img78677"> <div style=" padding: .5em; border: 1px solid #eee; background-color: #fff; "> <small class="name">Figure 2 <small class="pull-right" style="margin-right: .5em;color:#999;top: 3px;position: relative;">(p. 6)</small><span class="d-none type">figure</span></small> <div style=" background-image:url('/biblio/1221350/image/001/083/0010830/4/t0078677.png'); background-repeat:no-repeat; background-size:contain; background-position-x: center; width: 100%; height: 175px; margin-top:.5em; "> </div> </div> </a> </div> <div class="col-sm-3 float-left biblio-image-tile" data-apporder="p. 7" data-order="3" data-imgid="1221350-img78683" data-imgsrc="/biblio/1221350/image/001/083/0010830/4/0078683.png" data-title="Table 1" data-desc="Description of the observables studied in this analysis." data-ostiid="1221350" style="padding-bottom: 2em; border-bottom: 1px solid #ddd;"> <a href="#img" class="biblio-image-tile-a ga-click-event" data-imgid="1221350-img78683" data-lityx data-category="Extracted Images" data-label="biblio: image thumbnail" data-value="1221350-img78683"> <div style=" padding: .5em; border: 1px solid #eee; background-color: #fff; "> <small class="name">Table 1 <small class="pull-right" style="margin-right: .5em;color:#999;top: 3px;position: relative;">(p. 7)</small><span class="d-none type">table</span></small> <div style=" background-image:url('/biblio/1221350/image/001/083/0010830/4/t0078683.png'); background-repeat:no-repeat; background-size:contain; background-position-x: center; width: 100%; height: 175px; margin-top:.5em; "> </div> </div> </a> </div> <div class="col-sm-3 float-left biblio-image-tile" data-apporder="p. 11" data-order="4" data-imgid="1221350-img78679" data-imgsrc="/biblio/1221350/image/001/083/0010830/4/0078679.png" data-title="Figure 3" data-desc="(A) Data at 1.96 TeV, 900 GeV, and 300 GeV on the pseudorapidity distribution, dN/d$η$, for charged particles with |η| < 0.8 and $p$T > 0.5 GeV/$c$ and (C) $p$T > 1.0 GeV/$c$ for events with at least one charged particle with |$η$| < 0.8 and $p$T > 0.5 GeV/$c$ and $p$T > 1.0 GeV/$c$, respectively. (B) Data on the pseudorapidity distribution, dN/d$η$, at $η$ = 0 for charged particles with |$η$| < 0.8 and $p$T > 0.5 GeV/$c$ and (D) $p$T > 1.0 GeV/$c$ for events with at least one charged particle with |$η$| < 0.8 and $p$T > 0.5 GeV/$c$ and $p$T > 1.0 GeV/$c$, respectively, plotted versus the center-of mass energy. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty and are compared with PYTHIA 6.4 Tune Z1." data-ostiid="1221350" style="padding-bottom: 2em; border-bottom: 1px solid #ddd;"> <a href="#img" class="biblio-image-tile-a ga-click-event" data-imgid="1221350-img78679" data-lityx data-category="Extracted Images" data-label="biblio: image thumbnail" data-value="1221350-img78679"> <div style=" padding: .5em; border: 1px solid #eee; background-color: #fff; "> <small class="name">Figure 3 <small class="pull-right" style="margin-right: .5em;color:#999;top: 3px;position: relative;">(p. 11)</small><span class="d-none type">figure</span></small> <div style=" background-image:url('/biblio/1221350/image/001/083/0010830/4/t0078679.png'); background-repeat:no-repeat; background-size:contain; background-position-x: center; width: 100%; height: 175px; margin-top:.5em; "> </div> </div> </a> </div> <div class="col-sm-3 float-left biblio-image-tile" data-apporder="p. 11" data-order="5" data-imgid="1221350-img478881" data-imgsrc="/biblio/1221350/image/001/083/0010830/4/0478881.png" data-title="Table 2" data-desc="Data at 1.96 TeV, 900 GeV, and 300 GeV on the average overall number of charged particles and the average overall density of charged particle with |$η$| < 0.8 and $p$T > 0.5 GeV/$c$ for events with at least one charged particle with |$η$| < 0.8 and $p$T > 0.5 GeV/$c$. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty." data-ostiid="1221350" style="padding-bottom: 2em; border-bottom: 1px solid #ddd;"> <a href="#img" class="biblio-image-tile-a ga-click-event" data-imgid="1221350-img478881" data-lityx data-category="Extracted Images" data-label="biblio: image thumbnail" data-value="1221350-img478881"> <div style=" padding: .5em; border: 1px solid #eee; background-color: #fff; "> <small class="name">Table 2 <small class="pull-right" style="margin-right: .5em;color:#999;top: 3px;position: relative;">(p. 11)</small><span class="d-none type">table</span></small> <div style=" background-image:url('/biblio/1221350/image/001/083/0010830/4/t0478881.png'); background-repeat:no-repeat; background-size:contain; background-position-x: center; width: 100%; height: 175px; margin-top:.5em; "> </div> </div> </a> </div> <div class="col-sm-3 float-left biblio-image-tile" data-apporder="p. 12" data-order="6" data-imgid="1221350-img78692" data-imgsrc="/biblio/1221350/image/001/083/0010830/4/0078692.png" data-title="Figure 4" data-desc="Data at 1.96 TeV (A,B), 900 GeV (C,D), and 300 GeV (E,F) on the average overall number of charged particles with |$η$| < 0.8 and $p$T > 0.5 GeV/$c$ (including the leading charged particle) for events with at least one charged particle with |$η$| < 0.8 and $p$T > 0.5 GeV/$c$ plotted versus the transverse momentum of the leading charged particle, PTmax. The horizontal dashed lines correspond to the average overall number of charged particles with |$η$| < 0.8 and $p$T > 0.5 GeV/$c$ for events with at least one charged particle with |$η$| < 0.8 and $p$T > 0.5 GeV/$c$ if one includes all PTmax values (see Table 2). The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty, and are compared with PYTHIA Tune Z1 and Z2* (A,C,E) and PYTHIA Tune Z2* and 4C* (B,D,F)." data-ostiid="1221350" style="padding-bottom: 2em; border-bottom: 1px solid #ddd;"> <a href="#img" class="biblio-image-tile-a ga-click-event" data-imgid="1221350-img78692" data-lityx data-category="Extracted Images" data-label="biblio: image thumbnail" data-value="1221350-img78692"> <div style=" padding: .5em; border: 1px solid #eee; background-color: #fff; "> <small class="name">Figure 4 <small class="pull-right" style="margin-right: .5em;color:#999;top: 3px;position: relative;">(p. 12)</small><span class="d-none type">figure</span></small> <div style=" background-image:url('/biblio/1221350/image/001/083/0010830/4/t0078692.png'); background-repeat:no-repeat; background-size:contain; background-position-x: center; width: 100%; height: 175px; margin-top:.5em; "> </div> </div> </a> </div> <div class="col-sm-3 float-left biblio-image-tile" data-apporder="p. 13" data-order="7" data-imgid="1221350-img78687" data-imgsrc="/biblio/1221350/image/001/083/0010830/4/0078687.png" data-title="Figure 5" data-desc="Data at 1.96 TeV (A,B), 900 GeV (C,D), and 300 GeV (E,F) on the overall associated charged particle and charged PTsum density ($p$T > 0.5 GeV/$c$, |$η$| < 0.8) as defined by the leading charged particle, as a function of the $p$T of the leading charged particle, PTmax (where the vertical axis scale applies to both densities with appropriate units). The leading charged particle is not included in the overall associated density. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty, and are compared with PYTHIA Tune Z1 and Z2* (A,C,E) and PYTHIA Tune Z2* and 4C* (B,D,F)." data-ostiid="1221350" style="padding-bottom: 2em; border-bottom: 1px solid #ddd;"> <a href="#img" class="biblio-image-tile-a ga-click-event" data-imgid="1221350-img78687" data-lityx data-category="Extracted Images" data-label="biblio: image thumbnail" data-value="1221350-img78687"> <div style=" padding: .5em; border: 1px solid #eee; background-color: #fff; "> <small class="name">Figure 5 <small class="pull-right" style="margin-right: .5em;color:#999;top: 3px;position: relative;">(p. 13)</small><span class="d-none type">figure</span></small> <div style=" background-image:url('/biblio/1221350/image/001/083/0010830/4/t0078687.png'); background-repeat:no-repeat; background-size:contain; background-position-x: center; width: 100%; height: 175px; margin-top:.5em; "> </div> </div> </a> </div> <div class="col-sm-3 float-left biblio-image-tile" data-apporder="p. 14" data-order="8" data-imgid="1221350-img78686" data-imgsrc="/biblio/1221350/image/001/083/0010830/4/0078686.png" data-title="Figure 6" data-desc="Data at 1.96 TeV (A,B), 900 GeV (C,D), and 300 GeV (E,F) on the charged particle density ($p$T > 0.5 GeV/$c$, |$η$| < 0.8) in the toward, away, and transverse regions as defined by the leading charged particle, as a function of the $p$T of the leading charged particle, PTmax. The leading charged particle is not included in the toward density. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty, and are compared with PYTHIA Tune Z1 and Z2* (A,C,E) and PYTHIA Tune Z2* and 4C* (B,D,F)." data-ostiid="1221350" style="padding-bottom: 2em; border-bottom: 1px solid #ddd;"> <a href="#img" class="biblio-image-tile-a ga-click-event" data-imgid="1221350-img78686" data-lityx data-category="Extracted Images" data-label="biblio: image thumbnail" data-value="1221350-img78686"> <div style=" padding: .5em; border: 1px solid #eee; background-color: #fff; "> <small class="name">Figure 6 <small class="pull-right" style="margin-right: .5em;color:#999;top: 3px;position: relative;">(p. 14)</small><span class="d-none type">figure</span></small> <div style=" background-image:url('/biblio/1221350/image/001/083/0010830/4/t0078686.png'); background-repeat:no-repeat; background-size:contain; background-position-x: center; width: 100%; height: 175px; margin-top:.5em; "> </div> </div> </a> </div> <div class="col-sm-3 float-left biblio-image-tile" data-apporder="p. 15" data-order="9" data-imgid="1221350-img78680" data-imgsrc="/biblio/1221350/image/001/083/0010830/4/0078680.png" data-title="Figure 7" data-desc="Data at 1.96 TeV (A,B), 900 GeV (C,D), and 300 GeV (E,F) for the charged PTsum density ($p$T > 0.5 GeV/$c$, |$η$| < 0.8) in the toward, away, and transverse regions as defined by the leading charged particle, as a function of the $p$T of the leading charged particle, PTmax. The leading charged particle is not included in the toward density. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty, and are compared with PYTHIA Tune Z1 and Z2* (A,C,E) and PYTHIA Tune Z2* and 4C* (B,D,F)." data-ostiid="1221350" style="padding-bottom: 2em; border-bottom: 1px solid #ddd;"> <a href="#img" class="biblio-image-tile-a ga-click-event" data-imgid="1221350-img78680" data-lityx data-category="Extracted Images" data-label="biblio: image thumbnail" data-value="1221350-img78680"> <div style=" padding: .5em; border: 1px solid #eee; background-color: #fff; "> <small class="name">Figure 7 <small class="pull-right" style="margin-right: .5em;color:#999;top: 3px;position: relative;">(p. 15)</small><span class="d-none type">figure</span></small> <div style=" background-image:url('/biblio/1221350/image/001/083/0010830/4/t0078680.png'); background-repeat:no-repeat; background-size:contain; background-position-x: center; width: 100%; height: 175px; margin-top:.5em; "> </div> </div> </a> </div> <div class="col-sm-3 float-left biblio-image-tile" data-apporder="p. 16" data-order="10" data-imgid="1221350-img78696" data-imgsrc="/biblio/1221350/image/001/083/0010830/4/0078696.png" data-title="Figure 8" data-desc="Data at 1.96 TeV, 900 GeV, and 300 GeV on the charged particle density ($p$T > 0.5 GeV/$c$, |$η$| < 0.8) in the toward (A,B) and away (C,D) regions as defined by the leading charged particle, as a function of the $p$T of the leading charged particle, PTmax. The leading charged particle is not included in the toward density. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty, and are compared with PYTHIA Tune Z1 and Z2* (A,C) and PYTHIA Tune Z2* and 4C* (B,D)." data-ostiid="1221350" style="padding-bottom: 2em; border-bottom: 1px solid #ddd;"> <a href="#img" class="biblio-image-tile-a ga-click-event" data-imgid="1221350-img78696" data-lityx data-category="Extracted Images" data-label="biblio: image thumbnail" data-value="1221350-img78696"> <div style=" padding: .5em; border: 1px solid #eee; background-color: #fff; "> <small class="name">Figure 8 <small class="pull-right" style="margin-right: .5em;color:#999;top: 3px;position: relative;">(p. 16)</small><span class="d-none type">figure</span></small> <div style=" background-image:url('/biblio/1221350/image/001/083/0010830/4/t0078696.png'); background-repeat:no-repeat; background-size:contain; background-position-x: center; width: 100%; height: 175px; margin-top:.5em; "> </div> </div> </a> </div> <div class="col-sm-3 float-left biblio-image-tile" data-apporder="p. 16" data-order="11" data-imgid="1221350-img78697" data-imgsrc="/biblio/1221350/image/001/083/0010830/4/0078697.png" data-title="Figure 9" data-desc="Data at 1.96 TeV, 900 GeV, and 300 GeV on the charged PTsum density ($p$T > 0.5 GeV/$c$, |$η$| < 0.8) in the toward (A,B) and away (C,D) regions as defined by the leading charged particle, as a function of the $p$T of the leading charged particle, PTmax. The leading charged particle is not included in the toward density. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty, and are compared with PYTHIA Tune Z1 and Z2* (A,C) and PYTHIA Tune Z2* and 4C* (B,D)." data-ostiid="1221350" style="padding-bottom: 2em; border-bottom: 1px solid #ddd;"> <a href="#img" class="biblio-image-tile-a ga-click-event" data-imgid="1221350-img78697" data-lityx data-category="Extracted Images" data-label="biblio: image thumbnail" data-value="1221350-img78697"> <div style=" padding: .5em; border: 1px solid #eee; background-color: #fff; "> <small class="name">Figure 9 <small class="pull-right" style="margin-right: .5em;color:#999;top: 3px;position: relative;">(p. 16)</small><span class="d-none type">figure</span></small> <div style=" background-image:url('/biblio/1221350/image/001/083/0010830/4/t0078697.png'); background-repeat:no-repeat; background-size:contain; background-position-x: center; width: 100%; height: 175px; margin-top:.5em; "> </div> </div> </a> </div> <div class="col-sm-3 float-left biblio-image-tile" data-apporder="p. 17" data-order="12" data-imgid="1221350-img78691" data-imgsrc="/biblio/1221350/image/001/083/0010830/4/0078691.png" data-title="Figure 10" data-desc="Data at 1.96 TeV, 900 GeV, and 300 GeV on the charged particle density ($p$T > 0.5 GeV/$c$, |$η$| < 0.8) in the transMAX (A,B) and transMIN (C,D) regions as defined by the leading charged particle, as a function of the $p$T of the leading charged particle, PTmax. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty, and are compared with PYTHIA Tune Z1 and Z2* (A,C) and PYTHIA Tune Z2* and 4C* (B,D)." data-ostiid="1221350" style="padding-bottom: 2em; border-bottom: 1px solid #ddd;"> <a href="#img" class="biblio-image-tile-a ga-click-event" data-imgid="1221350-img78691" data-lityx data-category="Extracted Images" data-label="biblio: image thumbnail" data-value="1221350-img78691"> <div style=" padding: .5em; border: 1px solid #eee; background-color: #fff; "> <small class="name">Figure 10 <small class="pull-right" style="margin-right: .5em;color:#999;top: 3px;position: relative;">(p. 17)</small><span class="d-none type">figure</span></small> <div style=" background-image:url('/biblio/1221350/image/001/083/0010830/4/t0078691.png'); background-repeat:no-repeat; background-size:contain; background-position-x: center; width: 100%; height: 175px; margin-top:.5em; "> </div> </div> </a> </div> <div class="col-sm-3 float-left biblio-image-tile" data-apporder="p. 17" data-order="13" data-imgid="1221350-img78690" data-imgsrc="/biblio/1221350/image/001/083/0010830/4/0078690.png" data-title="Figure 11" data-desc="Data at 1.96 TeV, 900 GeV, and 300 GeV on the charged PTsum density ($p$T > 0.5 GeV/$c$, |$η$| < 0.8) in the transMAX (A,B) and transMIN (C,D) regions as defined by the leading charged particle, as a function of the $p$T of the leading charged particle, PTmax. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty, and are compared with PYTHIA Tune Z1 and Z2* (A,C) and PYTHIA Tune Z2* and 4C* (B,D)." data-ostiid="1221350" style="padding-bottom: 2em; border-bottom: 1px solid #ddd;"> <a href="#img" class="biblio-image-tile-a ga-click-event" data-imgid="1221350-img78690" data-lityx data-category="Extracted Images" data-label="biblio: image thumbnail" data-value="1221350-img78690"> <div style=" padding: .5em; border: 1px solid #eee; background-color: #fff; "> <small class="name">Figure 11 <small class="pull-right" style="margin-right: .5em;color:#999;top: 3px;position: relative;">(p. 17)</small><span class="d-none type">figure</span></small> <div style=" background-image:url('/biblio/1221350/image/001/083/0010830/4/t0078690.png'); background-repeat:no-repeat; background-size:contain; background-position-x: center; width: 100%; height: 175px; margin-top:.5em; "> </div> </div> </a> </div> <div class="col-sm-3 float-left biblio-image-tile" data-apporder="p. 19" data-order="14" data-imgid="1221350-img78688" data-imgsrc="/biblio/1221350/image/001/083/0010830/4/0078688.png" data-title="Figure 12" data-desc="Data at 1.96 TeV, 900 GeV, and 300 GeV on the charged particle density ($p$T > 0.5 GeV/$c$, |$η$| < 0.8) for transAVE = (transMAX+transMIN)/2 (A,B) and transDIF = transMAX-transMIN (C,D) as defined by the leading charged particle, as a function of the $p$T of the leading charged particle, PTmax. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty, and are compared with PYTHIA Tune Z1 and Z2* (A,C) and PYTHIA Tune Z2* and 4C* (B,D)." data-ostiid="1221350" style="padding-bottom: 2em; border-bottom: 1px solid #ddd;"> <a href="#img" class="biblio-image-tile-a ga-click-event" data-imgid="1221350-img78688" data-lityx data-category="Extracted Images" data-label="biblio: image thumbnail" data-value="1221350-img78688"> <div style=" padding: .5em; border: 1px solid #eee; background-color: #fff; "> <small class="name">Figure 12 <small class="pull-right" style="margin-right: .5em;color:#999;top: 3px;position: relative;">(p. 19)</small><span class="d-none type">figure</span></small> <div style=" background-image:url('/biblio/1221350/image/001/083/0010830/4/t0078688.png'); background-repeat:no-repeat; background-size:contain; background-position-x: center; width: 100%; height: 175px; margin-top:.5em; "> </div> </div> </a> </div> <div class="col-sm-3 float-left biblio-image-tile" data-apporder="p. 19" data-order="15" data-imgid="1221350-img78689" data-imgsrc="/biblio/1221350/image/001/083/0010830/4/0078689.png" data-title="Figure 13" data-desc="Data at 1.96 TeV, 900 GeV, and 300 GeV on the charged PTsum density ($p$T > 0.5 GeV/$c$, |$η$| < 0.8) for transAVE = (transMAX+transMIN)/2 (A,B) and transDIF = transMAX-transMIN (C,D) as defined by the leading charged particle, as a function of the $p$T of the leading charged particle, PTmax. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty, and are compared with PYTHIA Tune Z1 and Z2* (A,C) and PYTHIA Tune Z2* and 4C* (B,D)." data-ostiid="1221350" style="padding-bottom: 2em; border-bottom: 1px solid #ddd;"> <a href="#img" class="biblio-image-tile-a ga-click-event" data-imgid="1221350-img78689" data-lityx data-category="Extracted Images" data-label="biblio: image thumbnail" data-value="1221350-img78689"> <div style=" padding: .5em; border: 1px solid #eee; background-color: #fff; "> <small class="name">Figure 13 <small class="pull-right" style="margin-right: .5em;color:#999;top: 3px;position: relative;">(p. 19)</small><span class="d-none type">figure</span></small> <div style=" background-image:url('/biblio/1221350/image/001/083/0010830/4/t0078689.png'); background-repeat:no-repeat; background-size:contain; background-position-x: center; width: 100%; height: 175px; margin-top:.5em; "> </div> </div> </a> </div> <div class="col-sm-3 float-left biblio-image-tile" data-apporder="p. 20" data-order="16" data-imgid="1221350-img78693" data-imgsrc="/biblio/1221350/image/001/083/0010830/4/0078693.png" data-title="Figure 14" data-desc="(A,B) Data on the transMAX and transMIN charged particle density as defined by the leading charged particle, for 5.0 < PTmax < 6.0 GeV/$c$ plotted versus the center-of-mass energy for charged particles with $p$T > 0.5 GeV/$c$ and |$η$| < 0.8. (C,D) Ratio of the data at 1.96 TeV, 900 GeV, and 300 GeV to the corresponding value at 300 GeV for the transMAX and transMIN charged particle density plotted versus the center-of-mass energy. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty, and are compared with PYTHIA Tune Z1 and Z2* (A,C) and PYTHIA Tune Z2* and 4C* (B,D). The theory curves include the predictions of the PYTHIA tunes at 7 TeV." data-ostiid="1221350" style="padding-bottom: 2em; border-bottom: 1px solid #ddd;"> <a href="#img" class="biblio-image-tile-a ga-click-event" data-imgid="1221350-img78693" data-lityx data-category="Extracted Images" data-label="biblio: image thumbnail" data-value="1221350-img78693"> <div style=" padding: .5em; border: 1px solid #eee; background-color: #fff; "> <small class="name">Figure 14 <small class="pull-right" style="margin-right: .5em;color:#999;top: 3px;position: relative;">(p. 20)</small><span class="d-none type">figure</span></small> <div style=" background-image:url('/biblio/1221350/image/001/083/0010830/4/t0078693.png'); background-repeat:no-repeat; background-size:contain; background-position-x: center; width: 100%; height: 175px; margin-top:.5em; "> </div> </div> </a> </div> <div class="col-sm-3 float-left biblio-image-tile" data-apporder="p. 20" data-order="17" data-imgid="1221350-img78694" data-imgsrc="/biblio/1221350/image/001/083/0010830/4/0078694.png" data-title="Figure 15" data-desc="(A,B) Data on the transMAX and transMIN charged PTsum density as defined by the leading charged particle, for 5.0 < PTmax < 6.0 GeV/$c$ plotted versus the center-of-mass energy for charged particles with $p$T > 0.5 GeV/$c$ and |$η$| < 0.8. (C,D) Ratio of the data at 1.96 TeV, 900 GeV, and 300 GeV to the corresponding value at 300 GeV plotted versus the center-of-mass energy. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty, and are compared with PYTHIA Tune Z1 and Z2* (A,C) and PYTHIA Tune Z2* and 4C* (B,D). The theory curves include the predictions of the PYTHIA tunes at 7 TeV." data-ostiid="1221350" style="padding-bottom: 2em; border-bottom: 1px solid #ddd;"> <a href="#img" class="biblio-image-tile-a ga-click-event" data-imgid="1221350-img78694" data-lityx data-category="Extracted Images" data-label="biblio: image thumbnail" data-value="1221350-img78694"> <div style=" padding: .5em; border: 1px solid #eee; background-color: #fff; "> <small class="name">Figure 15 <small class="pull-right" style="margin-right: .5em;color:#999;top: 3px;position: relative;">(p. 20)</small><span class="d-none type">figure</span></small> <div style=" background-image:url('/biblio/1221350/image/001/083/0010830/4/t0078694.png'); background-repeat:no-repeat; background-size:contain; background-position-x: center; width: 100%; height: 175px; margin-top:.5em; "> </div> </div> </a> </div> <div class="col-sm-3 float-left biblio-image-tile" data-apporder="p. 21" data-order="18" data-imgid="1221350-img78681" data-imgsrc="/biblio/1221350/image/001/083/0010830/4/0078681.png" data-title="Figure 16" data-desc="(A,B) Data on the transAVE and transDIF charged particle density as defined by the leading charged particle, for 5.0 < PTmax < 6.0 GeV/$c$ plotted versus the center-of-mass energy for charged particles with $p$T > 0.5 GeV/$c$ and |$η$| < 0.8. (C,D) Ratio of the data at 1.96 TeV, 900 GeV, and 300 GeV to the corresponding value at 300 GeV plotted versus the center-of-mass energy. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty, and are compared with PYTHIA Tune Z1 and Z2* (A,C) and PYTHIA Tune Z2* and 4C* (B,D). The theory curves include the predictions of the PYTHIA tunes at 7 TeV." data-ostiid="1221350" style="padding-bottom: 2em; border-bottom: 1px solid #ddd;"> <a href="#img" class="biblio-image-tile-a ga-click-event" data-imgid="1221350-img78681" data-lityx data-category="Extracted Images" data-label="biblio: image thumbnail" data-value="1221350-img78681"> <div style=" padding: .5em; border: 1px solid #eee; background-color: #fff; "> <small class="name">Figure 16 <small class="pull-right" style="margin-right: .5em;color:#999;top: 3px;position: relative;">(p. 21)</small><span class="d-none type">figure</span></small> <div style=" background-image:url('/biblio/1221350/image/001/083/0010830/4/t0078681.png'); background-repeat:no-repeat; background-size:contain; background-position-x: center; width: 100%; height: 175px; margin-top:.5em; "> </div> </div> </a> </div> <div class="col-sm-3 float-left biblio-image-tile" data-apporder="p. 21" data-order="19" data-imgid="1221350-img78682" data-imgsrc="/biblio/1221350/image/001/083/0010830/4/0078682.png" data-title="Figure 17" data-desc="(A,B) Data on the transAVE and transDIF charged PTsum density as defined by the leading charged particle, for 5.0 < PTmax < 6.0 GeV/$c$ plotted versus the center-of-mass energy for charged particles with $p$T > 0.5 GeV/$c$ and |$η$| < 0.8. (C,D) Ratio of the data at 1.96 TeV, 900 GeV, and 300 GeV to the corresponding value at 300 GeV plotted versus the center-of-mass energy. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty, and are compared with PYTHIA Tune Z1 and Z2* (A,C) and PYTHIA Tune Z2* and 4C* (B,D). The theory curves include the predictions of the PYTHIA tunes at 7 TeV." data-ostiid="1221350" style="padding-bottom: 2em; border-bottom: 1px solid #ddd;"> <a href="#img" class="biblio-image-tile-a ga-click-event" data-imgid="1221350-img78682" data-lityx data-category="Extracted Images" data-label="biblio: image thumbnail" data-value="1221350-img78682"> <div style=" padding: .5em; border: 1px solid #eee; background-color: #fff; "> <small class="name">Figure 17 <small class="pull-right" style="margin-right: .5em;color:#999;top: 3px;position: relative;">(p. 21)</small><span class="d-none type">figure</span></small> <div style=" background-image:url('/biblio/1221350/image/001/083/0010830/4/t0078682.png'); background-repeat:no-repeat; background-size:contain; background-position-x: center; width: 100%; height: 175px; margin-top:.5em; "> </div> </div> </a> </div> <div class="col-sm-3 float-left biblio-image-tile" data-apporder="p. 22" data-order="20" data-imgid="1221350-img78685" data-imgsrc="/biblio/1221350/image/001/083/0010830/4/0078685.png" data-title="Figure 18" data-desc="Ratio of the data at 1.96 TeV, 900 GeV, and 300 GeV to the corresponding value at 300 GeV for the transMIN and transDIF charged particle density (A,B) and charged PTsum density (C,D) as defined by the leading charged particle, for 5.0 < PTmax < 6.0 GeV/$c$ plotted versus the center-of-mass energy. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty, and are compared with PYTHIA Tune Z1 and Z2* (A,C) and PYTHIA Tune Z2* and 4C* (B,D). The theory curves include the predictions of the PYTHIA tunes at 7 TeV." data-ostiid="1221350" style="padding-bottom: 2em; border-bottom: 1px solid #ddd;"> <a href="#img" class="biblio-image-tile-a ga-click-event" data-imgid="1221350-img78685" data-lityx data-category="Extracted Images" data-label="biblio: image thumbnail" data-value="1221350-img78685"> <div style=" padding: .5em; border: 1px solid #eee; background-color: #fff; "> <small class="name">Figure 18 <small class="pull-right" style="margin-right: .5em;color:#999;top: 3px;position: relative;">(p. 22)</small><span class="d-none type">figure</span></small> <div style=" background-image:url('/biblio/1221350/image/001/083/0010830/4/t0078685.png'); background-repeat:no-repeat; background-size:contain; background-position-x: center; width: 100%; height: 175px; margin-top:.5em; "> </div> </div> </a> </div> <div class="col-sm-3 float-left biblio-image-tile" data-apporder="p. 22" data-order="21" data-imgid="1221350-img78684" data-imgsrc="/biblio/1221350/image/001/083/0010830/4/0078684.png" data-title="Figure 19" data-desc="(A,B) Data at 1.96 TeV, 900 GeV, and 300 GeV on the charged particle average $p$T ($p$T > 0.5 GeV/$c$, |$η$| < 0.8) in the transverse region as defined by the leading charged particle, as a function of the $p$T of the leading charged particle, PTmax. (C,D) Data on the transverse charged particle average $p$T as defined by the leading charged particle, for 5.0 < PTmax < 6.0 GeV/$c$ plotted versus the center-of-mass energy for charged particles with $p$T > 0.5 GeV/$c$ and |$η$| < 0.8. The data are corrected to the particle level with errors that include both the statistical error and the systematic uncertainty, and are compared with PYTHIA Tune Z1 and Z2* (A,C) and PYTHIA Tune Z2* and 4C* (B,D)." data-ostiid="1221350" style="padding-bottom: 2em; border-bottom: 1px solid #ddd;"> <a href="#img" class="biblio-image-tile-a ga-click-event" data-imgid="1221350-img78684" data-lityx data-category="Extracted Images" data-label="biblio: image thumbnail" data-value="1221350-img78684"> <div style=" padding: .5em; border: 1px solid #eee; background-color: #fff; "> <small class="name">Figure 19 <small class="pull-right" style="margin-right: .5em;color:#999;top: 3px;position: relative;">(p. 22)</small><span class="d-none type">figure</span></small> <div style=" background-image:url('/biblio/1221350/image/001/083/0010830/4/t0078684.png'); background-repeat:no-repeat; background-size:contain; background-position-x: center; width: 100%; height: 175px; margin-top:.5em; "> </div> </div> </a> </div> </div> <div class="pagination-container small"> <a class="pure-button prev page" href="#" rel="prev"><span class="fa fa-angle-left"></span></a><ul class="pagination d-inline-block" style="padding-left:.2em;"></ul><a class="pure-button next page" href="#" rel="next"><span class="fa fa-angle-right"></span></a> </div> </div> </div> <div class="col-sm-3 order-sm-3"> <ul class="nav nav-stacked"> <li class="active"><a href="" class="reference-type-filter tab-nav" data-tab="biblio-images" data-filter="type" data-pattern="*"><span class="fa fa-angle-right"></span> All Images</a></li> <li class="small" style="margin-left:.75em; 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padding:1em;"> <em>Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.</em> </div> </div> </div> </section> <section id="biblio-related" class="tab-content tab-content-sec osti-curated" data-tab="biblio"> <div class="row"> <div class="col-sm-9 order-sm-9"> <section id="biblio-similar" class="tab-content tab-content-sec active" data-tab="related"> <div class="padding"> <p class="lead text-muted" style="font-size: 18px; margin-top:0px;">Similar Records in DOE PAGES and OSTI.GOV collections:</p> <aside> <ul class="item-list" itemscope itemtype="http://schema.org/ItemList" style="padding-left:0; list-style-type: none;"> <li> <div class="article item document" itemprop="itemListElement" itemscope itemtype="http://schema.org/WebPage"><meta itemprop="position" content="1" /><div class="item-info"> <h2 class="title" itemprop="name headline"><a href="/biblio/1247128-study-energy-dependence-underlying-event-proton-antiproton-collisions" itemprop="url">Study of the energy dependence of the underlying event in proton-antiproton collisions</a></h2> <div class="metadata"> <small class="text-muted" style="text-transform:uppercase;display:block;line-height:2.5em;">Journal Article</small><span class="authors"> <span class="author">Aaltonen, T.</span> ; <span class="author">Albrow, M.</span> ; <span class="author">Amerio, S.</span> ; <span class="author">...</span> <span class="text-muted pubdata"> - Physical Review. D, Particles, Fields, Gravitation and Cosmology</span> </span> </div> <div class="abstract">We study charged particle production (p(T) > 0.5 GeV/c, vertical bar eta vertical bar < 0.8) in proton-antiproton collisions at total center-of-mass energies root s = 300 GeV, 900 GeV, and 1.96 TeV. We use the direction of the charged particle with the largest transverse momentum in each event to define three regions of eta - phi space: "toward", "away", and "transverse." The average number and the average scalar pT sum of charged particles in the transverse region are sensitive to the modeling of the "underlying event." The transverse region is divided into a MAX and MIN transverse region, which<a href='#' onclick='$(this).hide().next().show().next().show();return false;' style='margin-left:10px;'>more »</a><span style='display:none;'> helps separate the "hard component" (initial and final-state radiation) from the "beam-beam remnant" and multiple parton interaction components of the scattering. The center-of-mass energy dependence of the various components of the event is studied in detail. The data presented here can be used to constrain and improve QCD Monte Carlo models, resulting in more precise predictions at the LHC energies of 13 and 14 TeV.</span><a href='#' onclick='$(this).hide().prev().hide().prev().show();return false;' style='margin-left:10px;display:none;'>« less</a></div><div class="metadata-links small clearfix text-muted" style="margin-top:15px;"> <div class="pure-menu pure-menu-horizontal pull-right" style="width:unset;"> <ul class="pure-menu-list"> <li class="pure-menu-item"><span class="item-info-ftlink"><a class="misc doi-link " href="https://doi.org/10.1103/PhysRevD.92.092009" target="_blank" rel="noopener" title="Link to document DOI" data-ostiid="1247128" data-product-type="Journal Article" data-product-subtype="AC" >https://doi.org/10.1103/PhysRevD.92.092009</a></span></li> </ul> </div> </div> </div> <div class="clearfix"></div> </div> </li> <li> <div class="article item document" itemprop="itemListElement" itemscope itemtype="http://schema.org/WebPage"><meta itemprop="position" content="2" /><div class="item-info"> <h2 class="title" itemprop="name headline"><a href="/biblio/981488-studying-underlying-event-drell-yan-high-transverse-momentum-jet-production-tevatron" itemprop="url">Studying the Underlying Event in Drell-Yan and High Transverse Momentum Jet Production at the Tevatron</a></h2> <div class="metadata"> <small class="text-muted" style="text-transform:uppercase;display:block;line-height:2.5em;">Journal Article</small><span class="authors"> <span class="author">,</span> ; <span class="author">Aaltonen, T</span> ; <span class="author">Adelman, J</span> ; <span class="author">...</span> <span class="text-muted pubdata"> - Submitted to Phys.Rev.D.</span> </span> </div> <div class="abstract">We study the underlying event in proton-antiproton collisions by examining the behavior of charged particles (transverse momentum p{sub T} > 0.5 GeV/c, pseudorapidity |{eta}| < 1) produced in association with large transverse momentum jets ({approx}2.2 fb{sup -1}) or with Drell-Yan lepton-pairs ({approx}2.7 fb{sup -1}) in the Z-boson mass region (70 < M(pair) < 110 GeV/c{sup 2}) as measured by CDF at 1.96 TeV center-of-mass energy. We use the direction of the lepton-pair (in Drell-Yan production) or the leading jet (in high-p{sub T} jet production) in each event to define three regions of {eta}-{phi} space; toward, away, and transverse, where {phi}<a href='#' onclick='$(this).hide().next().show().next().show();return false;' style='margin-left:10px;'>more »</a><span style='display:none;'> is the azimuthal scattering angle. For Drell-Yan production (excluding the leptons) both the toward and transverse regions are very sensitive to the underlying event. In high-p{sub T} jet production the transverse region is very sensitive to the underlying event and is separated into a MAX and MIN transverse region, which helps separate the hard component (initial and final-state radiation) from the beam-beam remnant and multiple parton interaction components of the scattering. The data are corrected to the particle level to remove detector effects and are then compared with several QCD Monte-Carlo models. The goal of this analysis is to provide data that can be used to test and improve the QCD Monte-Carlo models of the underlying event that are used to simulate hadron-hadron collisions.</span><a href='#' onclick='$(this).hide().prev().hide().prev().show();return false;' style='margin-left:10px;display:none;'>« less</a></div><div class="metadata-links small clearfix text-muted" style="margin-top:15px;"> <div class="pure-menu pure-menu-horizontal pull-right" style="width:unset;"> <ul class="pure-menu-list"> <li class="pure-menu-item"><span class="item-info-ftlink"><a class="misc fulltext-link " href="/servlets/purl/981488" title="Link to document media" target="_blank" rel="noopener" data-ostiid="981488" data-product-type="Journal Article" data-product-subtype="FT" >Full Text Available</a></span></li> </ul> </div> </div> </div> <div class="clearfix"></div> </div> </li> <li> <div class="article item document" itemprop="itemListElement" itemscope itemtype="http://schema.org/WebPage"><meta itemprop="position" content="3" /><div class="item-info"> <h2 class="title" itemprop="name headline"><a href="/pages/biblio/1407246-measurement-underlying-event-jet-events-from-tev-protonproton-collisions-atlas-detector" itemprop="url">Measurement of the underlying event in jet events from 7 TeV proton–proton collisions with the ATLAS detector</a></h2> <div class="metadata"> <small class="text-muted" style="text-transform:uppercase;display:block;line-height:2.5em;">Journal Article</small><span class="authors"> <span class="author">Aad, G.</span> ; <span class="author">Abajyan, T.</span> ; <span class="author">Abbott, B.</span> ; <span class="author">...</span> <span class="text-muted pubdata"> - European Physical Journal. C, Particles and Fields</span> </span> </div> <div class="abstract">Distributions sensitive to the underlying event in QCD jet events have been measured with the ATLAS detector at the LHC, based on 37 pb<sup>-1</sup> of proton–proton collision data collected at a centre-of-mass energy of 7 TeV. Charged-particle mean p<sub>T</sub> and densities of all-particle E<sub>T</sub> and charged-particle multiplicity and p<sub>T</sub> have been measured in regions azimuthally transverse to the hardest jet in each event. These are presented both as one-dimensional distributions and with their mean values as functions of the leading-jet transverse momentum from 20 to 800 GeV. The correlation of charged-particle mean p<sub>T</sub> with charged-particle multiplicity is also studied, and<a href='#' onclick='$(this).hide().next().show().next().show();return false;' style='margin-left:10px;'>more »</a><span style='display:none;'> the E<sub>T</sub> densities include the forward rapidity region; these features provide extra data constraints for Monte Carlo modelling of colour reconnection and beam-remnant effects respectively. For the first time, underlying event observables have been computed separately for inclusive jet and exclusive dijet event selections, allowing more detailed study of the interplay of multiple partonic scattering and QCD radiation contributions to the underlying event. Comparisons to the predictions of different Monte Carlo models show a need for further model tuning, but the standard approach is found to generally reproduce the features of the underlying event in both types of event selection.</span><a href='#' onclick='$(this).hide().prev().hide().prev().show();return false;' style='margin-left:10px;display:none;'>« less</a></div><div class="metadata-links small clearfix text-muted" style="margin-top:15px;"> <span class="fa fa-book text-muted" aria-hidden="true"></span> Cited by 18<div class="pure-menu pure-menu-horizontal pull-right" style="width:unset;"> <ul class="pure-menu-list"> <li class="pure-menu-item"><span class="item-info-ftlink"><a class="misc doi-link " href="https://doi.org/10.1140/epjc/s10052-014-2965-5" target="_blank" rel="noopener" title="Link to document DOI" data-ostiid="1407246" data-product-type="Journal Article" data-product-subtype="AM" >https://doi.org/10.1140/epjc/s10052-014-2965-5</a></span></li> <li class="pure-menu-item"><span class="item-info-ftlink"><a class="misc fulltext-link " href="/pages/servlets/purl/1407246" title="Link to document media" target="_blank" rel="noopener" data-ostiid="1407246" data-product-type="Journal Article" data-product-subtype="AM" >Full Text Available</a></span></li> </ul> </div> </div> </div> <div class="clearfix"></div> </div> </li> <li> <div class="article item document" itemprop="itemListElement" itemscope itemtype="http://schema.org/WebPage"><meta itemprop="position" content="4" /><div class="item-info"> <h2 class="title" itemprop="name headline"><a href="/pages/biblio/1221321-measurement-underlying-event-activity-using-charged-particle-jets-proton-proton-collisions-sqrt-tev" itemprop="url">Measurement of the underlying event activity using charged-particle jets in proton-proton collisions at $$\sqrt{s}$$ = 2.76 TeV</a></h2> <div class="metadata"> <small class="text-muted" style="text-transform:uppercase;display:block;line-height:2.5em;">Journal Article</small><span class="authors"> <span class="author">Khachatryan, V.</span> <span class="text-muted pubdata"> - Journal of High Energy Physics (Online)</span> </span> </div> <div class="abstract">A measurement of the underlying event (UE) activity in proton-proton collisions is performed using events with charged-particle jets produced in the central pseudorapidity region (|η<sup> jet</sup>| < 2) and with transverse momentum 1 ≤ p<sub>T</sub> <sup>jet</sup> < 100 GeV. The analysis uses a data sample collected at a centre-of-mass energy of 2.76 TeV with the CMS experiment at the LHC. The UE activity is measured as a function of p<sub>T</sub><sup> jet</sup> in terms of the average multiplicity and scalar sum of transverse momenta (p<sub>T</sub>) of charged particles, with |η| < 2 and p<sub>T</sub> > 0.5 GeV, in the azimuthal region<a href='#' onclick='$(this).hide().next().show().next().show();return false;' style='margin-left:10px;'>more »</a><span style='display:none;'> transverse to the highest p<sub>T</sub> jet direction. By further dividing the transverse region into two regions of smaller and larger activity, various components of the UE activity are separated. As a result, the measurements are compared to previous results at 0.9 and 7 TeV, and to predictions of several Monte Carlo event generators, providing constraints on the modelling of the UE dynamics</span><a href='#' onclick='$(this).hide().prev().hide().prev().show();return false;' style='margin-left:10px;display:none;'>« less</a></div><div class="metadata-links small clearfix text-muted" style="margin-top:15px;"> <span class="fa fa-book text-muted" aria-hidden="true"></span> Cited by 4<div class="pure-menu pure-menu-horizontal pull-right" style="width:unset;"> <ul class="pure-menu-list"> <li class="pure-menu-item"><span class="item-info-ftlink"><a class="misc doi-link " href="https://doi.org/10.1007/JHEP09(2015)137" target="_blank" rel="noopener" title="Link to document DOI" data-ostiid="1221321" data-product-type="Journal Article" data-product-subtype="AM" >https://doi.org/10.1007/JHEP09(2015)137</a></span></li> <li class="pure-menu-item"><span class="item-info-ftlink"><a class="misc fulltext-link " href="/pages/servlets/purl/1221321" title="Link to document media" target="_blank" rel="noopener" data-ostiid="1221321" data-product-type="Journal Article" data-product-subtype="AM" >Full Text Available</a></span></li> </ul> </div> </div> </div> <div class="clearfix"></div> </div> </li> <li> <div class="article item document" itemprop="itemListElement" itemscope itemtype="http://schema.org/WebPage"><meta itemprop="position" content="5" /><div class="item-info"> <h2 class="title" itemprop="name headline"><a href="/biblio/21432842-studying-underlying-event-drell-yan-high-transverse-momentum-jet-production-tevatron" itemprop="url">Studying the underlying event in Drell-Yan and high transverse momentum jet production at the Tevatron</a></h2> <div class="metadata"> <small class="text-muted" style="text-transform:uppercase;display:block;line-height:2.5em;">Journal Article</small><span class="authors"> <span class="author">Aaltonen, T</span> ; <span class="author">Mehtala, P</span> ; <span class="author">Orava, R</span> ; <span class="author">...</span> <span class="text-muted pubdata"> - Physical Review. D, Particles Fields</span> </span> </div> <div class="abstract">We study the underlying event in proton-antiproton collisions by examining the behavior of charged particles produced in association with a large transverse momentum jet ({approx}2.2 fb{sup -1}) or with a Drell-Yan lepton pair ({approx}2.7 fb{sup -1}) in the Z-boson mass region [70<M(pair)<110 GeV/c{sup 2}] as measured by CDF at 1.96 TeV center-of-mass energy. We use the direction of the lepton pair or the leading jet in each event to define regions of {eta}-{phi} space that are sensitive to the modeling of the underlying event. The data are corrected to the particle level to remove detector effects and are then compared<a href='#' onclick='$(this).hide().next().show().next().show();return false;' style='margin-left:10px;'>more »</a><span style='display:none;'> with several QCD Monte Carlo models.</span><a href='#' onclick='$(this).hide().prev().hide().prev().show();return false;' style='margin-left:10px;display:none;'>« less</a></div><div class="metadata-links small clearfix text-muted" style="margin-top:15px;"> <div class="pure-menu pure-menu-horizontal pull-right" style="width:unset;"> <ul class="pure-menu-list"> <li class="pure-menu-item"><span class="item-info-ftlink"><a class="misc doi-link " href="https://doi.org/10.1103/PHYSREVD.82.034001" target="_blank" rel="noopener" title="Link to document DOI" data-ostiid="21432842" data-product-type="Journal Article" data-product-subtype="" >https://doi.org/10.1103/PHYSREVD.82.034001</a></span></li> </ul> </div> </div> </div> <div class="clearfix"></div> </div> </li> </ul> </aside> </div> </section> <section id="biblio-related-works" class="tab-content tab-content-sec" data-tab="related"> <div class="padding"> <p class="lead text-muted" style="font-size: 18px; margin-top:0px;"><span style="text-transform:capitalize;">Other research</span> related to this record:</p> <aside> <div class="list"> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.17182/hepdata.70787.v1" target="_blank" rel="noopener noreferrer" class="name">Study of the energy dependence of the underlying event in proton-antiproton collisions<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">dataset</span>, <span class="date" data-date="2016-02-01">February 2016</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Aaltonen, Timo Antero; Amerio, Silvia; Amidei, Dante E.</span> </li> <li> HEPData, vp</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.17182/hepdata.70787.v1" class="text-muted" target="_blank" rel="noopener noreferrer">10.17182/hepdata.70787.v1<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> <li class="text-right"> <em class="text-muted"> This dataset is a supplement to the current record</em> </li> </ul> <hr/> </div> <div> <h2 class="title" style="margin-bottom:0;" data-apporder=""> <a href="https://doi.org/10.17182/hepdata.70787" target="_blank" rel="noopener noreferrer" class="name">Study of the energy dependence of the underlying event in proton-antiproton collisions<span class="fa fa-external-link" aria-hidden="true"></span></a> <small class="text-muted" style="text-transform:uppercase; font-size:0.75rem;"><br/> <span class="type">dataset</span>, <span class="date" data-date="2016-02-01">February 2016</span></small> </h2> <ul class="small references-list" style="list-style-type:none; margin-top: 0.5em; padding-left: 0; line-height:1.8em;"> <li> <span style="color:#5C7B2D;"> Aaltonen, Timo-Antero; Amerio, Silvia; Amidei, Dante E.</span> </li> <li> HEPData, vp</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.17182/hepdata.70787" class="text-muted" target="_blank" rel="noopener noreferrer">10.17182/hepdata.70787<span class="fa fa-external-link" aria-hidden="true"></span></a></span> </li> <li class="text-right"> <em class="text-muted"> This dataset is a supplement to the current record</em> </li> </ul> <hr/> </div> </div> <div class="pagination-container small"> <a class="pure-button prev page" href="#" rel="prev"><span class="fa fa-angle-left"></span></a><ul class="pagination d-inline-block" style="padding-left:.2em;"></ul><a class="pure-button next page" href="#" rel="next"><span class="fa fa-angle-right"></span></a> </div> </aside> </div> </section> </div> <div class="col-sm-3 order-sm-3"> <ul class="nav nav-stacked"> <li class="active"><a href="#biblio-similar" class="tab-nav" data-tab="related" onclick="$('form.related-search').hide();"><span class="fa fa-angle-right"></span> Similar Records</a></li> <li class=""><a href="#biblio-related-works" class="reference-type-filter tab-nav" data-tab="related" data-filter="type" data-pattern="*" onclick="$('form.related-search').show();" style="margin-top: 2em;"><span class="fa fa-angle-right"></span> Related Works</a></li> <!-- <li><a class="tab-nav disabled" data-tab="related" style="color: #636c72 !important; 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