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Title: Study of final-state radiation in decays of Z bosons produced in $pp$ collisions at 7 TeV

Abstract

The differential cross sections for the production of photons in Z→μ +μ -γ decays are presented as a function of the transverse energy of the photon and its separation from the nearest muon. The data for these measurements are collected with the CMS detector and correspond to an integrated luminosity of 4.7 fb -1 of pp collisions at √s=7 TeV delivered by the CERN LHC. The cross sections are compared to simulations with powheg and pythia, where pythia is used to simulate parton showers and final-state photons. These simulations match the data to better than 5%.

Authors:
 [1]
  1. Yerevan Physics Inst. (YerPhI) (Armenia); et al.
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Org.:
CMS Collaboration
OSTI Identifier:
1193900
Alternate Identifier(s):
OSTI ID: 1221272
Report Number(s):
FERMILAB-PUB-15-060-CMS; CERN-PH-EP-2015-031; CMS-EWK-11-016
Journal ID: ISSN 1550-7998; arXiv eprint number arXiv:1502.07940; TRN: US1600877
Grant/Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article: Published Article
Journal Name:
Physical Review. D, Particles, Fields, Gravitation and Cosmology
Additional Journal Information:
Journal Volume: 91; Journal Issue: 9; 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

Khachatryan, Vardan. Study of final-state radiation in decays of Z bosons produced in $pp$ collisions at 7 TeV. United States: N. p., 2015. Web. doi:10.1103/PhysRevD.91.092012.
Khachatryan, Vardan. Study of final-state radiation in decays of Z bosons produced in $pp$ collisions at 7 TeV. United States. doi:10.1103/PhysRevD.91.092012.
Khachatryan, Vardan. Fri . "Study of final-state radiation in decays of Z bosons produced in $pp$ collisions at 7 TeV". United States. doi:10.1103/PhysRevD.91.092012.
@article{osti_1193900,
title = {Study of final-state radiation in decays of Z bosons produced in $pp$ collisions at 7 TeV},
author = {Khachatryan, Vardan},
abstractNote = {The differential cross sections for the production of photons in Z→μ+μ-γ decays are presented as a function of the transverse energy of the photon and its separation from the nearest muon. The data for these measurements are collected with the CMS detector and correspond to an integrated luminosity of 4.7 fb-1 of pp collisions at √s=7 TeV delivered by the CERN LHC. The cross sections are compared to simulations with powheg and pythia, where pythia is used to simulate parton showers and final-state photons. These simulations match the data to better than 5%.},
doi = {10.1103/PhysRevD.91.092012},
journal = {Physical Review. D, Particles, Fields, Gravitation and Cosmology},
issn = {1550-7998},
number = 9,
volume = 91,
place = {United States},
year = {2015},
month = {5}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevD.91.092012

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Cited by: 2 works
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Figures / Tables:

TABLE I TABLE I: Summary of kinematic and fiducial event requirements.

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Works referenced in this record:

SVD approach to data unfolding
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M.</span> </li> <li> Physics Letters B, Vol. 722, Issue 1-3</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.1016/j.physletb.2013.03.024" class="text-muted" target="_blank" rel="noopener noreferrer">10.1016/j.physletb.2013.03.024<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-tab="biblio-references" data-filter="type" data-pattern="*"><span class="fa fa-angle-right"></span> All References</a></li> <li class="small" style="margin-left:.75em; text-transform:capitalize;"><a href="" class="reference-type-filter tab-nav" data-tab="biblio-references" data-filter="type" data-pattern="journal"><span class="fa fa-angle-right"></span> journal<small class="text-muted"> (19)</small></a></li> </ul> <div style="margin-top:2em;"> <form class="pure-form small text-muted reference-search"> <label for="reference-search-text" class="sr-only">Search</label> <input class="search form-control pure-input-1" id="reference-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="reference-search-sort-name"><label for="reference-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="reference-search-sort-date"><label for="reference-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. 2" data-order="1" data-imgid="1193900-img106774" data-imgsrc="/biblio/1193900/image/001/082/0010823/2/0106774.png" data-title="TABLE I" data-desc="Summary of kinematic and fiducial event requirements." data-ostiid="1193900" style="padding-bottom: 2em; border-bottom: 1px solid #ddd;"> <a href="#img" class="biblio-image-tile-a ga-click-event" data-imgid="1193900-img106774" data-lityx data-category="Extracted Images" data-label="biblio: image thumbnail" data-value="1193900-img106774"> <div style=" padding: .5em; border: 1px solid #eee; background-color: #fff; "> <small class="name">TABLE I <small class="pull-right" style="margin-right: .5em;color:#999;top: 3px;position: relative;">(p. 2)</small><span class="d-none type">table</span></small> <div style=" background-image:url('/biblio/1193900/image/001/082/0010823/2/t0106774.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. 4" data-order="2" data-imgid="1193900-img78637" data-imgsrc="/biblio/1193900/image/001/082/0010823/2/0078637.png" data-title="FIG. 1" data-desc="(color online). Distributions of the photon isolation variable Iγ for the control region (top) and for the signal region (bottom) after all corrections have been applied. The bottom panels display the ratio of data to the MC expectation. The requirement for FSR photons is Iγ < 6 GeV." data-ostiid="1193900" style="padding-bottom: 2em; border-bottom: 1px solid #ddd;"> <a href="#img" class="biblio-image-tile-a ga-click-event" data-imgid="1193900-img78637" data-lityx data-category="Extracted Images" data-label="biblio: image thumbnail" data-value="1193900-img78637"> <div style=" padding: .5em; border: 1px solid #eee; background-color: #fff; "> <small class="name">FIG. 1 <small class="pull-right" style="margin-right: .5em;color:#999;top: 3px;position: relative;">(p. 4)</small><span class="d-none type">figure</span></small> <div style=" background-image:url('/biblio/1193900/image/001/082/0010823/2/t0078637.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. 4" data-order="3" data-imgid="1193900-img78636" data-imgsrc="/biblio/1193900/image/001/082/0010823/2/0078636.png" data-title="TABLE II" data-desc="Composition of the signal sample. The simulation has been tuned to reproduce the data in the control region." data-ostiid="1193900" style="padding-bottom: 2em; border-bottom: 1px solid #ddd;"> <a href="#img" class="biblio-image-tile-a ga-click-event" data-imgid="1193900-img78636" data-lityx data-category="Extracted Images" data-label="biblio: image thumbnail" data-value="1193900-img78636"> <div style=" padding: .5em; border: 1px solid #eee; background-color: #fff; "> <small class="name">TABLE II <small class="pull-right" style="margin-right: .5em;color:#999;top: 3px;position: relative;">(p. 4)</small><span class="d-none type">table</span></small> <div style=" background-image:url('/biblio/1193900/image/001/082/0010823/2/t0078636.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. 5" data-order="4" data-imgid="1193900-img106775" data-imgsrc="/biblio/1193900/image/001/082/0010823/2/0106775.png" data-title="TABLE III" data-desc="Relative systematic uncertainties for dσ/dET (in percent)." data-ostiid="1193900" style="padding-bottom: 2em; border-bottom: 1px solid #ddd;"> <a href="#img" class="biblio-image-tile-a ga-click-event" data-imgid="1193900-img106775" data-lityx data-category="Extracted Images" data-label="biblio: image thumbnail" data-value="1193900-img106775"> <div style=" padding: .5em; border: 1px solid #eee; background-color: #fff; "> <small class="name">TABLE III <small class="pull-right" style="margin-right: .5em;color:#999;top: 3px;position: relative;">(p. 5)</small><span class="d-none type">table</span></small> <div style=" background-image:url('/biblio/1193900/image/001/082/0010823/2/t0106775.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="5" data-imgid="1193900-img106777" data-imgsrc="/biblio/1193900/image/001/082/0010823/2/0106777.png" data-title="TABLE IV" data-desc="Relative systematic uncertainties for dσ/dΔRμγ (in percent)." data-ostiid="1193900" style="padding-bottom: 2em; border-bottom: 1px solid #ddd;"> <a href="#img" class="biblio-image-tile-a ga-click-event" data-imgid="1193900-img106777" data-lityx data-category="Extracted Images" data-label="biblio: image thumbnail" data-value="1193900-img106777"> <div style=" padding: .5em; border: 1px solid #eee; background-color: #fff; "> <small class="name">TABLE IV <small class="pull-right" style="margin-right: .5em;color:#999;top: 3px;position: relative;">(p. 6)</small><span class="d-none type">table</span></small> <div style=" background-image:url('/biblio/1193900/image/001/082/0010823/2/t0106777.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="6" data-imgid="1193900-img78633" data-imgsrc="/biblio/1193900/image/001/082/0010823/2/0078633.png" data-title="FIG. 2" data-desc="(color online). Two examples of an s distribution s = 1 − (M$2\atop{μμγ}$ – M$2\atop{μμ}$)=(M$2\atop{Z}$ – $2\atop{μμ}$) fit with a skewed Gaussian as described in the text. The top and bottom plots pertain to photons in the ECAL barrel with 5 < ET < 10 GeV and in the ECAL end caps with 20 < ET < 40 GeV, respectively. The circle points and solid curve represent the data and the triangle points and dotted curve represent the simulation." data-ostiid="1193900" style="padding-bottom: 2em; border-bottom: 1px solid #ddd;"> <a href="#img" class="biblio-image-tile-a ga-click-event" data-imgid="1193900-img78633" data-lityx data-category="Extracted Images" data-label="biblio: image thumbnail" data-value="1193900-img78633"> <div style=" padding: .5em; border: 1px solid #eee; background-color: #fff; "> <small class="name">FIG. 2 <small class="pull-right" style="margin-right: .5em;color:#999;top: 3px;position: relative;">(p. 7)</small><span class="d-none type">figure</span></small> <div style=" background-image:url('/biblio/1193900/image/001/082/0010823/2/t0078633.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="7" data-imgid="1193900-img78632" data-imgsrc="/biblio/1193900/image/001/082/0010823/2/0078632.png" data-title="FIG. 3" data-desc="(color online). Measured differential cross sections dσ/dET (top) and dσ/dΔRμγ (bottom). In the upper panels, the dots with error bars represent the data, and the shaded bands represent the POWHEG + PYTHIA calculation including theoretical uncertainties. The central panels display the ratio of data to the MC expectation. The lower panels show the standard deviations of the measurements with respect to the calculation. A bin-centering procedure has been applied." data-ostiid="1193900" style="padding-bottom: 2em; border-bottom: 1px solid #ddd;"> <a href="#img" class="biblio-image-tile-a ga-click-event" data-imgid="1193900-img78632" data-lityx data-category="Extracted Images" data-label="biblio: image thumbnail" data-value="1193900-img78632"> <div style=" padding: .5em; border: 1px solid #eee; background-color: #fff; "> <small class="name">FIG. 3 <small class="pull-right" style="margin-right: .5em;color:#999;top: 3px;position: relative;">(p. 7)</small><span class="d-none type">figure</span></small> <div style=" background-image:url('/biblio/1193900/image/001/082/0010823/2/t0078632.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. 8" data-order="8" data-imgid="1193900-img106781" data-imgsrc="/biblio/1193900/image/001/082/0010823/2/0106781.png" data-title="TABLE V" data-desc="Measured differential cross section dσ/dET in pb=GeV. For the data values, the first uncertainty is statistical and the second is systematic. For the theory values, the uncertainty combines statistical, PDF, and renormalization/factorization scale components." data-ostiid="1193900" style="padding-bottom: 2em; border-bottom: 1px solid #ddd;"> <a href="#img" class="biblio-image-tile-a ga-click-event" data-imgid="1193900-img106781" data-lityx data-category="Extracted Images" data-label="biblio: image thumbnail" data-value="1193900-img106781"> <div style=" padding: .5em; border: 1px solid #eee; background-color: #fff; "> <small class="name">TABLE V <small class="pull-right" style="margin-right: .5em;color:#999;top: 3px;position: relative;">(p. 8)</small><span class="d-none type">table</span></small> <div style=" background-image:url('/biblio/1193900/image/001/082/0010823/2/t0106781.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. 9" data-order="9" data-imgid="1193900-img106782" data-imgsrc="/biblio/1193900/image/001/082/0010823/2/0106782.png" data-title="TABLE VI" data-desc="Measured differential cross section dσ/dΔRμγ in pb. For the data values, the first uncertainty is statistical and the second is systematic. For the theory values, the uncertainty combines statistical, PDF, and renormalization/factorization scale components." data-ostiid="1193900" style="padding-bottom: 2em; border-bottom: 1px solid #ddd;"> <a href="#img" class="biblio-image-tile-a ga-click-event" data-imgid="1193900-img106782" data-lityx data-category="Extracted Images" data-label="biblio: image thumbnail" data-value="1193900-img106782"> <div style=" padding: .5em; border: 1px solid #eee; background-color: #fff; "> <small class="name">TABLE VI <small class="pull-right" style="margin-right: .5em;color:#999;top: 3px;position: relative;">(p. 9)</small><span class="d-none type">table</span></small> <div style=" background-image:url('/biblio/1193900/image/001/082/0010823/2/t0106782.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. 10" data-order="10" data-imgid="1193900-img78634" data-imgsrc="/biblio/1193900/image/001/082/0010823/2/0078634.png" data-title="FIG. 4" data-desc="(color online). Measured differential cross sections dσ/dET for photons close to the muon (0.05 < ΔRμγ ≤ 0.5, left) and far from the muon (0.5 < ΔRμγ ≤ 3, right). The dots with error bars represent the data, and the shaded bands represent the POWHEGþ PYTHIA calculation including theoretical uncertainties. The central panels display the ratio of data to the MC expectation. The lower panels show the standard deviations of the measurements with respect to the calculation. A bin-centering procedure has been applied." data-ostiid="1193900" style="padding-bottom: 2em; border-bottom: 1px solid #ddd;"> <a href="#img" class="biblio-image-tile-a ga-click-event" data-imgid="1193900-img78634" data-lityx data-category="Extracted Images" data-label="biblio: image thumbnail" data-value="1193900-img78634"> <div style=" padding: .5em; border: 1px solid #eee; background-color: #fff; "> <small class="name">FIG. 4 <small class="pull-right" style="margin-right: .5em;color:#999;top: 3px;position: relative;">(p. 10)</small><span class="d-none type">figure</span></small> <div style=" background-image:url('/biblio/1193900/image/001/082/0010823/2/t0078634.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="11" data-imgid="1193900-img78630" data-imgsrc="/biblio/1193900/image/001/082/0010823/2/0078630.png" data-title="FIG. 5" data-desc="(color online). Measured differential cross sections dσ/dET and dσ/dΔRμγ for qT < 10 GeV (top row) and qT > 50 GeV (bottom row). The dots with error bars represent the data, and the shaded bands represent the POWHEG + PYTHIA calculation including theoretical uncertainties. The central panels display the ratio of data to the MC expectation. The lower panels show the standard deviations of the measurements with respect to the calculation. A bin-centering procedure has been applied." data-ostiid="1193900" style="padding-bottom: 2em; border-bottom: 1px solid #ddd;"> <a href="#img" class="biblio-image-tile-a ga-click-event" data-imgid="1193900-img78630" data-lityx data-category="Extracted Images" data-label="biblio: image thumbnail" data-value="1193900-img78630"> <div style=" padding: .5em; border: 1px solid #eee; background-color: #fff; "> <small class="name">FIG. 5 <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/1193900/image/001/082/0010823/2/t0078630.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="12" data-imgid="1193900-img78638" data-imgsrc="/biblio/1193900/image/001/082/0010823/2/0078638.png" data-title="FIG. 6" data-desc="FIG. 6 (color online). Distributions of the dimuon mass Mμμ (top) and the three-body mass Mμμγ (bottom). The dots with error bars represent the data, and the shaded bands represent the POWHEG + PYTHIA prediction. The central panels display the ratio of data to the MC expectation. The lower panels show the standard deviations of the measurements with respect to the calculation. A bin-centering procedure has been applied." data-ostiid="1193900" style="padding-bottom: 2em; border-bottom: 1px solid #ddd;"> <a href="#img" class="biblio-image-tile-a ga-click-event" data-imgid="1193900-img78638" data-lityx data-category="Extracted Images" data-label="biblio: image thumbnail" data-value="1193900-img78638"> <div style=" padding: .5em; border: 1px solid #eee; background-color: #fff; "> <small class="name">FIG. 6 <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/1193900/image/001/082/0010823/2/t0078638.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; text-transform:capitalize;"><a href="" class="reference-type-filter tab-nav ga-click-event" data-tab="biblio-images" data-filter="type" data-pattern="figure" data-category="Extracted Images" data-label="biblio: image filter - figure"><span class="fa fa-angle-right"></span> figures<small class="text-muted"> (6)</small></a></li> <li class="small" style="margin-left:.75em; text-transform:capitalize;"><a href="" class="reference-type-filter tab-nav ga-click-event" data-tab="biblio-images" data-filter="type" data-pattern="table" data-category="Extracted Images" data-label="biblio: image filter - table"><span class="fa fa-angle-right"></span> tables<small class="text-muted"> (6)</small></a></li> </ul> <div style="margin-top:2em;"> <form class="pure-form small text-muted image-search"> <label for="image-search-text" class="sr-only">Search</label> <input class="search form-control pure-input-1" id="image-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 ga-click-event" name="images-sort" data-sort="name" style="position:relative;top:2px;" id="image-search-sort-name" data-category="Extracted Images" data-label="biblio: image sort - name"><label for="image-search-sort-name" style="margin-left: .3em;">Sort by figure / table title</label></div> <div style="margin-left:1em; font-weight:normal; line-height: 1.6em;"><input type="radio" class="sort ga-click-event" name="images-sort" data-sort="order" style="position:relative;top:2px;" id="image-search-sort-date" data-category="Extracted Images" data-label="biblio: image sort - order"><label for="image-search-sort-date" style="margin-left: .3em;">Sort by page order</label></div> </fieldset> <div class="text-left" style="margin-top:1.5em;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 class="text-muted small" style="margin-top:2em; 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 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="0" /><div class="item-info"> <h2 class="title" itemprop="name headline"><a href="/biblio/1221272-study-final-state-radiation-decays-bosons-produced-pp-collisions" itemprop="url">Study of final-state radiation in decays of Z bosons produced in $pp$ collisions at 7 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, Vardan</span> <span class="text-muted pubdata"> - Physical Review. D, Particles, Fields, Gravitation and Cosmology</span> </span> </div> <div class="abstract">The differential cross sections for the production of photons in Z→μ <sup>+</sup>μ <sup>-</sup>γ decays are presented as a function of the transverse energy of the photon and its separation from the nearest muon. The data for these measurements are collected with the CMS detector and correspond to an integrated luminosity of 4.7 fb <sup>-1</sup> of pp collisions at √s=7 TeV delivered by the CERN LHC. The cross sections are compared to simulations with powheg and pythia, where pythia is used to simulate parton showers and final-state photons. These simulations match the data to better than 5%.</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 2<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">DOI: <a class="misc doi-link " href="https://doi.org/10.1103/PhysRevD.91.092012" target="_blank" rel="noopener" title="Link to document DOI" data-ostiid="1221272" data-product-type="Journal Article" data-product-subtype="AM" >10.1103/PhysRevD.91.092012</a></span></li> <li class="pure-menu-item"><span class="item-info-ftlink"><a class="misc fulltext-link " href="/servlets/purl/1221272" title="Link to document media" target="_blank" rel="noopener" data-ostiid="1221272" 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="1" /><div class="item-info"> <h2 class="title" itemprop="name headline"><a href="/biblio/968356-studying-+jet-production-proton-antiproton-collisions-tev" itemprop="url">Studying Z/γ*+Jet Production in proton-antiproton collisions at √s = 1.96 TeV</a></h2> <div class="metadata"> <small class="text-muted" style="text-transform:uppercase;display:block;line-height:2.5em;">Thesis/Dissertation</small><span class="authors"> <span class="author">Nilsen, Henrik Wold</span> <span class="text-muted pubdata"></span> </span> </div> <div class="abstract">The production of jets in association with a Z/γ* boson is an example of an important class of processes at hadron colliders, namely vector boson + jet (V + jet) production. Comparisons of measurements of this class of processes with theory predictions constitute an important, fundamental test of the Standard Model of particle physics, and of the theory of QCD in particular. While having a smaller cross section than other V +jet processes, Z/γ*(→ e <sup>+</sup>e <sup>-</sup>) + jets production, with Z/γ* {yields} e <sup>+</sup>e <sup>-</sup>/μ <sup>+</sup>μ <sup>-</sup>, has a distinct experimental signature allowing for measurements characterized by low backgrounds and a direct, precise measurement of the properties of the decay products of the Z/γ* boson. In this thesis, several new measurements of the properties of jets produced in association with a Z/γ* boson in p<a href='#' onclick='$(this).hide().next().show().next().show();return false;' style='margin-left:10px;'>more »</a><span style='display:none;'> $$\bar{p}$$ collisions at √s = 1.96 TeV are presented. The cross section for Z/γ*(→ e <sup>+</sup>e <sup>-</sup>) + N jet production (N ≤ 3) is measured, differential in the transverse momentum of the Nth jet in the event, normalized to the inclusive Z/γ* cross section. Also, the cross section for Z/γ*(→e <sup>+</sup>e <sup>-</sup>) + N jets (N ≥ 1) is measured, differential in the difference in azimuthal angle between the di-electron system and any jet in the event, normalized to unity. The data used in the measurements were collected by the D0 experiment located at the Tevatron Collider of the Fermi National Accelerator Laboratory and correspond to an integrated luminosity of 1.04 fb <sup>-1</sup>. The measured jet transverse momentum spectra are compared with the predictions of perturbative calculations at the next-to-leading order in the strong coupling constant. Given the low sensitivity of the calculations to model parameters, these comparisons represent a stringent test of perturbative QCD. One of the main goals currently being pursued in particle physics is the discovery of the only particle predicted by the Standard Model which has so far no been detected experimentally, namely the Higgs boson. It is assumed that the ATLAS and CMS experiments located at the Large Hadron Collider (LHC), a proton-proton collider at √s = 14 TeV, will be able to detect the Higgs boson, or rule out its existence, within the next few years. The collisions delivered by the LHC will also be used to perform a long range of searches for other new particles, for instance particles predicted by models based on the principle of supersymmetry. The associated production of vector bosons with jets has relatively large production rates at the LHC and can produce a long list of different final states which can include charged leptons, missing transverse energy, as well as light- and heavy-flavour jets. This makes V + jet production a major source of background events to many searches for new particles. Most techniques used for estimating the expected number of background events to searches rely on passing the stable final-state particles of simulated hadron collisions generated using a so-called event generator code, through a simulation of the experimental detector system. The development of event generators which are capable of reliably predicting the properties of jets produced in association with a core process, e.g. the production of a vector boson, has been the subject of a large amount of research activity during the last ten years. These efforts have led to the appearance of the CKKW and MLM algorithms which are implemented in several event generators, among them SHERPA and ALPGEN + PYTHIA. The large data sample collected by the D0 experiment during Run II offers an excellent opportunity for validating these new event generators against experimental measurements of V + jet production. As argued above, the Z/γ*(→ e <sup>+</sup>e <sup>-</sup>) + jets process offers the combination of a clean experimental signature and large production rates, making it the process of choice for these studies.</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">DOI: <a class="misc doi-link " href="https://doi.org/10.2172/968356" target="_blank" rel="noopener" title="Link to document DOI" data-ostiid="968356" data-product-type="Thesis/Dissertation" data-product-subtype="" >10.2172/968356</a></span></li> <li class="pure-menu-item"><span class="item-info-ftlink"><a class="misc fulltext-link " href="/servlets/purl/968356" title="Link to document media" target="_blank" rel="noopener" data-ostiid="968356" data-product-type="Thesis/Dissertation" data-product-subtype="" >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="2" /><div class="item-info"> <h2 class="title" itemprop="name headline"><a href="/biblio/1255356-measurements-production-pp-collisions-tev-atlas-detector" itemprop="url">Measurements of <math> <mi> Z </mi> <mi> γ </mi> </math> and <math> <mi> Z </mi> <mi> γ </mi> <mi> γ </mi> </math> production in <math> <mi> p </mi> <mi> p </mi> </math> collisions at <math> <msqrt> <mi> s </mi> </msqrt> <mo> = </mo> <mn> 8 </mn> <mtext> </mtext> <mtext> </mtext> <mi> TeV </mi> </math> 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">Abbott, B.</span> ; <span class="author">Abdallah, J.</span> ; <span class="author">...</span> <span class="text-muted pubdata"> - Physical Review D</span> </span> </div> <div class="abstract">The production of Z bosons with one or two isolated high-energy photons is studied using pp collisions at √s=8 TeV. The analyses use a data sample with an integrated luminosity of 20.3 fb <sup>-1</sup> collected by the ATLAS detector during the 2012 LHC data taking. The Zγ and Zγγ production cross sections are measured with leptonic (e <sup>+</sup>e <sup>-</sup>, μ <sup>+</sup>μ <sup>-</sup>, νν¯) decays of the Z boson, in extended fiducial regions defined in terms of the lepton and photon acceptance. They are then compared to cross-section predictions from the Standard Model, where the sources of the photons are radiation<a href='#' onclick='$(this).hide().next().show().next().show();return false;' style='margin-left:10px;'>more »</a><span style='display:none;'> off initial-state quarks and radiative Z-boson decay to charged leptons, and from fragmentation of final-state quarks and gluons into photons. The yields of events with photon transverse energy E <sub>T</sub> > 250 GeV from ℓ <sup>+</sup>ℓ <sup>-</sup>γ events and with E <sub>T</sub> > 400 GeV from νν¯γ events are used to search for anomalous triple gauge-boson couplings ZZγ and Zγγ. The yields of events with diphoton invariant mass m <sub>γγ</sub> > 200 GeV from ℓ <sup>+</sup>ℓ <sup>-</sup>γγ events and with m <sub>γγ</sub> > 300 GeV from νν¯γγ events are used to search for anomalous quartic gauge-boson couplings ZZγγ and Zγγγ. As a result, no deviations from Standard Model predictions are observed and limits are placed on parameters used to describe anomalous triple and quartic gauge-boson couplings.</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 7<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">DOI: <a class="misc doi-link " href="https://doi.org/10.1103/PhysRevD.93.112002" target="_blank" rel="noopener" title="Link to document DOI" data-ostiid="1255356" data-product-type="Journal Article" data-product-subtype="PA" >10.1103/PhysRevD.93.112002</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="/biblio/1256069-measurements-production-pp-collisions-tev-atlas-detector" itemprop="url">Measurements of <math> <mi> Z </mi> <mi> γ </mi> </math> and <math> <mi> Z </mi> <mi> γ </mi> <mi> γ </mi> </math> production in <math> <mi> p </mi> <mi> p </mi> </math> collisions at <math> <msqrt> <mi> s </mi> </msqrt> <mo> = </mo> <mn> 8 </mn> <mtext> </mtext> <mtext> </mtext> <mi> TeV </mi> </math> 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">Abbott, B.</span> ; <span class="author">Abdallah, J.</span> ; <span class="author">...</span> <span class="text-muted pubdata"> - Physical Review D</span> </span> </div> <div class="abstract">The production of Z bosons with one or two isolated high-energy photons is studied using pp collisions at √s=8 TeV. The analyses use a data sample with an integrated luminosity of 20.3 fb <sup>-1</sup> collected by the ATLAS detector during the 2012 LHC data taking. The Zγ and Zγγ production cross sections are measured with leptonic (e <sup>+</sup>e <sup>-</sup>, μ <sup>+</sup>μ <sup>-</sup>, νν¯) decays of the Z boson, in extended fiducial regions defined in terms of the lepton and photon acceptance. They are then compared to cross-section predictions from the Standard Model, where the sources of the photons are radiation<a href='#' onclick='$(this).hide().next().show().next().show();return false;' style='margin-left:10px;'>more »</a><span style='display:none;'> off initial-state quarks and radiative Z-boson decay to charged leptons, and from fragmentation of final-state quarks and gluons into photons. The yields of events with photon transverse energy E <sub>T</sub> > 250 GeV from ℓ <sup>+</sup>ℓ <sup>-</sup>γ events and with E <sub>T</sub> > 400 GeV from νν¯γ events are used to search for anomalous triple gauge-boson couplings ZZγ and Zγγ. The yields of events with diphoton invariant mass m <sub>γγ</sub> > 200 GeV from ℓ <sup>+</sup>ℓ <sup>-</sup>γγ events and with m <sub>γγ</sub> > 300 GeV from νν¯γγ events are used to search for anomalous quartic gauge-boson couplings ZZγγ and Zγγγ. As a result, no deviations from Standard Model predictions are observed and limits are placed on parameters used to describe anomalous triple and quartic gauge-boson couplings.</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 7<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">DOI: <a class="misc doi-link " href="https://doi.org/10.1103/PhysRevD.93.112002" target="_blank" rel="noopener" title="Link to document DOI" data-ostiid="1256069" data-product-type="Journal Article" data-product-subtype="AM" >10.1103/PhysRevD.93.112002</a></span></li> <li class="pure-menu-item"><span class="item-info-ftlink"><a class="misc fulltext-link " href="/servlets/purl/1256069" title="Link to document media" target="_blank" rel="noopener" data-ostiid="1256069" 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="/biblio/1376067-search-massive-resonances-decaying-ww-wz-zz-qw-qz-dijet-final-states-tev" itemprop="url">Search for massive resonances decaying into <math> <mi> W </mi> <mi> W </mi> </math> , <math> <mi> W </mi> <mi> Z </mi> </math> , <math> <mi> Z </mi> <mi> Z </mi> </math> , <math> <mi> q </mi> <mi> W </mi> </math> , and <math> <mi> q </mi> <mi> Z </mi> </math> with dijet final states at <math> <mrow> <msqrt> <mrow> <mi> s </mi> </mrow> </msqrt> <mo> = </mo> <mn> 13 </mn> <mtext> </mtext> <mtext> </mtext> <mi> TeV </mi> </mrow> </math></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">Sirunyan, A. M.</span> ; <span class="author">Tumasyan, A.</span> ; <span class="author">Adam, W.</span> ; <span class="author">...</span> <span class="text-muted pubdata"> - Physical Review D</span> </span> </div> <div class="abstract">Results are presented from a search in the dijet final state for new massive narrow resonances decaying to pairs of W and Z bosons or to a W/Z boson and a quark. Results are based on data recorded in proton-proton collisions at √s = 13 TeV with the CMS detector at the CERN LHC. The data correspond to an integrated luminosity of 35.9 fb <sup>-1</sup>. The mass range investigated extends upwards from 1.2 TeV. No excess is observed above the estimated standard model background and limits are set at 95% confidence level on cross sections, which are interpreted in terms<a href='#' onclick='$(this).hide().next().show().next().show();return false;' style='margin-left:10px;'>more »</a><span style='display:none;'> of various models that predict gravitons, heavy spin-1 bosons, and excited quarks. In a heavy vector triplet model, W' and Z' resonances, with masses below 3.2 and 2.7 TeV, respectively, and spin-1 resonances with degenerate masses below 3.8 TeV are excluded at 95% confidence level. In the case of a singlet W' resonance masses between 3.3 and 3.6 TeV can be excluded additionally. Similarly, excited quark resonances, q*, decaying to qW and qZ with masses less than 5.0 and 4.7 TeV, respectively, are excluded. In a narrow-width bulk graviton model, upper limits are set on cross sections ranging from 0.6 fb for high resonance masses above 3.6 TeV, to 36.0 fb for low resonance masses of 1.3 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;"> <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">DOI: <a class="misc doi-link " href="https://doi.org/10.1103/PhysRevD.97.072006" target="_blank" rel="noopener" title="Link to document DOI" data-ostiid="1376067" data-product-type="Journal Article" data-product-subtype="AM" >10.1103/PhysRevD.97.072006</a></span></li> <li class="pure-menu-item"><span class="item-info-ftlink"><a class="misc fulltext-link " href="/servlets/purl/1376067" title="Link to document media" target="_blank" rel="noopener" data-ostiid="1376067" 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> </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.67634" target="_blank" rel="noopener noreferrer" class="name">Study of Final-State Radiation in Decays of Z Bosons Produced in $pp$ Collisions at 7 TeV [Supplemental Data]<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="2015-05-29">May 2015</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:#7cb342;"> Khachatryan, Vardan; Sirunyan, Albert M.; Tumasyan, Armen</span> </li> <li> HEPData-Supplementary information for journal article at DOI: 10.1103/PhysRevD.91.092012, 8 data tables</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.17182/hepdata.67634" class="text-muted" target="_blank" rel="noopener noreferrer">10.17182/hepdata.67634<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.67634.v1" target="_blank" rel="noopener noreferrer" class="name">Study of Final-State Radiation in Decays of Z Bosons Produced in pp Collisions at 7 TeV [Supplemental Data]<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="2015-05-29">May 2015</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:#7cb342;"> , </span> </li> <li> HEPData-Supplementary information for journal article at DOI: 10.1103/PhysRevD.91.092012, 8 data tables</li> <li> <span class="text-muted related-url">DOI: <a href="https://doi.org/10.17182/hepdata.67634.v1" class="text-muted" target="_blank" rel="noopener noreferrer">10.17182/hepdata.67634.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> <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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