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Title: Searching in CMS open data for dimuon resonances with substantial transverse momentum

Abstract

We study dimuon events in 2.11 fb - 1 of 7 TeV p p collisions, using CMS Open Data, and search for a narrow dimuon resonance with moderate mass (14–66 GeV) and substantial transverse momentum ( p T ). Applying dimuon p T cuts of 25 and 60 GeV, we explore two overlapping samples: one with isolated muons, and one with prompt muons without an isolation requirement. Using the latter sample requires information about detector effects and QCD backgrounds, which we obtain directly from the CMS Open Data. We present model-independent limits on the product of cross section, branching fraction, acceptance, and efficiencies. These limits are stronger, relative to a corresponding inclusive search without a p T cut, by factors of as much as 9. Our “ p T -enhanced” dimuon search strategy provides improved sensitivity to models in which a new particle is produced mainly in the decay of something heavier, as could occur, for example, in decays of the Higgs boson or of a TeV-scale top partner. An implementation of this method with the current 13 TeV data should improve the sensitivity to such signals further by roughly an order of magnitude.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP); Simons Foundation; European Research Council (ERC)
OSTI Identifier:
1542687
Alternate Identifier(s):
OSTI ID: 1630640
Grant/Contract Number:  
SC0011090; SC0013607; SC0012567; SC0013999
Resource Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Name: Physical Review D Journal Volume: 100 Journal Issue: 1; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Cesarotti, Cari, Soreq, Yotam, Strassler, Matthew J., Thaler, Jesse, and Xue, Wei. Searching in CMS open data for dimuon resonances with substantial transverse momentum. United States: N. p., 2019. Web. doi:10.1103/PhysRevD.100.015021.
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Cesarotti, Cari, Soreq, Yotam, Strassler, Matthew J., Thaler, Jesse, & Xue, Wei. Searching in CMS open data for dimuon resonances with substantial transverse momentum. United States. https://doi.org/10.1103/PhysRevD.100.015021
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Cesarotti, Cari, Soreq, Yotam, Strassler, Matthew J., Thaler, Jesse, and Xue, Wei. Tue . "Searching in CMS open data for dimuon resonances with substantial transverse momentum". United States. https://doi.org/10.1103/PhysRevD.100.015021.
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@article{osti_1542687,
title = {Searching in CMS open data for dimuon resonances with substantial transverse momentum},
author = {Cesarotti, Cari and Soreq, Yotam and Strassler, Matthew J. and Thaler, Jesse and Xue, Wei},
abstractNote = {We study dimuon events in 2.11fb-1 of 7 TeV pp collisions, using CMS Open Data, and search for a narrow dimuon resonance with moderate mass (14–66 GeV) and substantial transverse momentum (pT). Applying dimuon pT cuts of 25 and 60 GeV, we explore two overlapping samples: one with isolated muons, and one with prompt muons without an isolation requirement. Using the latter sample requires information about detector effects and QCD backgrounds, which we obtain directly from the CMS Open Data. We present model-independent limits on the product of cross section, branching fraction, acceptance, and efficiencies. These limits are stronger, relative to a corresponding inclusive search without a pT cut, by factors of as much as 9. Our “pT-enhanced” dimuon search strategy provides improved sensitivity to models in which a new particle is produced mainly in the decay of something heavier, as could occur, for example, in decays of the Higgs boson or of a TeV-scale top partner. An implementation of this method with the current 13 TeV data should improve the sensitivity to such signals further by roughly an order of magnitude.},
doi = {10.1103/PhysRevD.100.015021},
journal = {Physical Review D},
number = 1,
volume = 100,
place = {United States},
year = {2019},
month = {7}
}
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<span class="author">Bar-Shalom, Shaouly</span> ; <span class="author">Soni, Amarjit</span> ; <span class="author">...</span> <span class="text-muted pubdata"> - Physical Review D</span> </span> </div> <div class="abstract">T<a href='#' onclick='$(this).hide().next().show().next().show();return false;' style='margin-left:10px;'>more »</a><span style='display:none;'> he associated production of a single-top with opposite-sign same-flavor (OSSF) dileptons, <math> <mi> p </mi><mi> p </mi><mo> → </mo><mi> t </mi><msup> <mo> ℓ </mo> <mo> + </mo> </msup><msup> <mo> ℓ </mo> <mo> - </mo> </msup> </math> and <math> <mi> p </mi><mi> p </mi><mo> → </mo><mi> t </mi><msup> <mo> ℓ </mo> <mo> + </mo> </msup><msup> <mo> ℓ </mo> <mo> - </mo> </msup><mo> + </mo><mi> j </mi> </math> ( <math> <mrow> <mi> j </mi> <mo> = </mo> <mi> light </mi> <mtext> </mtext> <mi> jet </mi> </mrow> </math>), can lead to striking trilepton <math> <mi> p </mi><mi> p </mi><mo> → </mo><msup> <mo> ℓ </mo> <mo> ' </mo> </msup><msup> <mo> ℓ </mo> <mo> + </mo> </msup><msup> <mo> ℓ </mo> <mo> - </mo> </msup><mo> + </mo><mi> X </mi> </math> and dilepton <math> <mi> p </mi><mi> p </mi><mo> → </mo><msup> <mo> ℓ </mo> <mo> + </mo> </msup><msup> <mo> ℓ </mo> <mo> - </mo> </msup><mo> + </mo><msub> <mi> j </mi> <mi> b </mi> </msub><mo> + </mo><mi> X </mi> </math> ( <math> <mrow> <msub> <mrow> <mi> j </mi> </mrow> <mrow> <mi> b </mi> </mrow> </msub> <mo> = </mo> <mi> b </mi> <mtext> - </mtext> <mi> jet </mi> </mrow> </math>) events at the LHC, after the top decays. Although these rather generic multilepton signals are flavor-blind, they can be generated by new 4-Fermi flavor changing (FC) <math> <msub> <mi> u </mi> <mi> i </mi> </msub><mi> t </mi><mo> ℓ </mo><mo> ℓ </mo> </math> scalar, vector and tensor interactions ( <math> <msub> <mi> u </mi> <mi> i </mi> </msub><mo> ε </mo><mi> u </mi> </math>, <math> <mrow> <mi> c </mi> </mrow> </math>), which we study in this paper; we match the FC <math> <mrow> <msub> <mrow> <mi> u </mi> </mrow> <mrow> <mi> i </mi> </mrow> </msub> <mi> t </mi> <mo> ℓ </mo> <mo> ℓ </mo> </mrow> </math> 4-Fermi terms to the SMEF operators and also to different types of FC underlying heavy physics. he main backgrounds to these di- and trilepton signals arise from <math> <mi> t </mi><mover> <mi> t </mi> <mo> ¯ </mo> </mover> </math>, <math> <mi> Z </mi><mo> + </mo><mrow> <mtext> jets </mtext> </mrow> </math> and <math> <mi> V </mi><mi> V </mi> </math> ( <math> <mrow> <mi> V </mi> <mo> = </mo> <mi> W </mi> </mrow> </math>, <math> <mrow> <mi> Z </mi> </mrow> </math>) production, but they can be essentially eliminated with a sufficiently high invariant mass selection on the OSSF dileptons, <math> <mrow> <msubsup> <mrow> <mi> m </mi> </mrow> <mrow> <msup> <mrow> <mo> ℓ </mo> </mrow> <mrow> <mo> + </mo> </mrow> </msup> <msup> <mrow> <mo> ℓ </mo> </mrow> <mrow> <mo> - </mo> </mrow> </msup> </mrow> <mrow> <mi mathvariant="sans-serif"> min </mi> </mrow> </msubsup> <mo> ( </mo> <mi> OSSF </mi> <mo> ) </mo> <mo> ≳ </mo> <mn> 1 </mn> <mtext> </mtext> <mi> eV </mi> </mrow> </math>; the use of <math> <mi> b </mi> </math>-tagging as an additional selection in the dilepton final state case also proves very useful. We find, for example, that the expected 95% CL bounds on the scale of a tensor(vector) <math> <mi> u </mi><mi> t </mi><mi> μ </mi><mi> μ </mi> </math> interaction, with the current <math> <mo> ~ </mo><mn> 140 </mn><mtext> </mtext><mtext> </mtext><msup> <mrow> <mi> fb </mi> </mrow> <mrow> <mo> - </mo> <mn> 1 </mn> </mrow> </msup> </math> of LHC data, are <math> <mrow> <mi mathvariant="normal"> Λ </mi> <mo> ≲ </mo> <mn> 5 </mn> <mo> ( </mo> <mn> 3.2 </mn> <mo> ) </mo> <mtext> </mtext> <mtext> </mtext> <mi> eV </mi> </mrow> </math> or <math> <mrow> <mi mathvariant="normal"> Λ </mi> <mo> ≲ </mo> <mn> 4.1 </mn> <mo> ( </mo> <mn> 2.7 </mn> <mo> ) </mo> <mtext> </mtext> <mtext> </mtext> <mi> eV </mi> </mrow> </math>, if analyzed via the dimuon <math> <msup> <mi> μ </mi> <mo> + </mo> </msup><msup> <mi> μ </mi> <mo> - </mo> </msup><mo> + </mo><msub> <mi> j </mi> <mi> b </mi> </msub> </math> signal or the <math> <mi> e </mi><msup> <mi> μ </mi> <mo> + </mo> </msup><msup> <mi> μ </mi> <mo> - </mo> </msup> </math> trilepton one, respectively. he expected reach at the HL-LHC with <math> <mrow> <mn> 3000 </mn> <mtext> </mtext> <mtext> </mtext> <msup> <mrow> <mi> fb </mi> </mrow> <mrow> <mo> - </mo> <mn> 1 </mn> </mrow> </msup> </mrow> </math> of data is <math> <mrow> <mi mathvariant="normal"> Λ </mi> <mo> ≲ </mo> <mn> 7.1 </mn> <mo> ( </mo> <mn> 4.7 </mn> <mo> ) </mo> <mtext> </mtext> <mtext> </mtext> <mi> eV </mi> </mrow> </math> and <math> <mrow> <mi mathvariant="normal"> Λ </mi> <mo> ≲ </mo> <mn> 2.4 </mn> <mo> ( </mo> <mn> 1.5 </mn> <mo> ) </mo> <mtext> </mtext> <mtext> </mtext> <mi> eV </mi> </mrow> </math> for the corresponding <math> <mi> u </mi><mi> t </mi><mi> μ </mi><mi> μ </mi> </math> and <math> <mi> c </mi><mi> t </mi><mi> μ </mi><mi> μ </mi> </math> operators. his should be compared to the current bounds of <math> <mrow> <mi mathvariant="normal"> Λ </mi> <mo> ≲ </mo> <mi mathvariant="script"> O </mi> <mo> ( </mo> <mn> 1 </mn> <mo> ) </mo> <mtext> </mtext> <mtext> </mtext> <mi> eV </mi> </mrow> </math> on both the <math> <mi> u </mi><mi> t </mi><mo> ℓ </mo><mo> ℓ </mo> </math> and <math> <mi> c </mi><mi> t </mi><mo> ℓ </mo><mo> ℓ </mo> </math> operators from LEP2 and from <math> <mi> p </mi><mi> p </mi><mo> → </mo><mi> t </mi><mover> <mi> t </mi> <mo> ¯ </mo> </mover> </math> followed by <math> <mi> t </mi><mo> → </mo><msup> <mo> ℓ </mo> <mo> + </mo> </msup><msup> <mo> ℓ </mo> <mo> - </mo> </msup><mi> j </mi> </math>. We also study the potential sensitivity at future 27 eV and 100 eV high-energy LHC successors, which, for the <math> <mi> u </mi><mi> t </mi><mo> ℓ </mo><mo> ℓ </mo> </math> operators, can reach <math> <mi mathvariant="normal"> Λ </mi><mo> ~ </mo><mn> 10 </mn><mi> – </mi><mn> 40 </mn><mtext> </mtext><mtext> </mtext><mi> eV </mi> </math>. We furthermore discuss the possible implications of this class of FC 4-Fermi effective interactions on lepton nonuniversality tests at the LHC.</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.103.075031" target="_blank" rel="noopener" title="Link to document DOI" data-ostiid="1781143" data-product-type="Journal Article" data-product-subtype="PA" >https://doi.org/10.1103/PhysRevD.103.075031</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/1708976-production-forward-rapidity-collisions-gev" itemprop="url">Production of <math><mi> b </mi> <mover> <mi> b </mi> <mo> ¯ </mo> </mover> </math> at forward rapidity in <math><mi> p </mi> <mo> + </mo> <mi> p </mi> </math> collisions at <math><msqrt> <mi> s </mi> </msqrt> <mo> = </mo> <mn> 510 </mn> <mtext>   </mtext> <mtext>   </mtext> <mi> GeV </mi> </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">Acharya, U.</span> ; <span class="author">Adare, A.</span> ; <span class="author">Aidala, C.</span> ; <span class="author">...</span> <span class="text-muted pubdata"> - Physical Review D</span> </span> </div> <div class="abstract">T<a href='#' onclick='$(this).hide().next().show().next().show();return false;' style='margin-left:10px;'>more »</a><span style='display:none;'> he cross section of bottom quark-antiquark ( <math> <mi> b </mi><mover> <mi> b </mi> <mo> ¯ </mo> </mover> </math>) production in <math> <mi> p </mi><mo> + </mo><mi> p </mi> </math> collisions at <math> <msqrt> <mi> s </mi> </msqrt><mo> = </mo><mn> 510 </mn><mtext> </mtext><mtext> </mtext><mi> GeV </mi> </math> is measured with the PHENIX detector at the Relativistic Heavy Ion Collider. he results are based on the yield of high mass, like-sign muon pairs measured within the PHENIX muon arm acceptance ( <math> <mn> 1.2 </mn><mo> < </mo><mo> | </mo><mi> y </mi><mo> | </mo><mo> < </mo><mn> 2.2 </mn> </math>). he <math> <mi> b </mi><mover> <mi> b </mi> <mo> ¯ </mo> </mover> </math> signal is extracted from like-sign dimuons by utilizing the unique properties of neutral <math> <mi> B </mi> </math> meson oscillation. We report a differential cross section of <math> <mrow> <mi> d </mi> <msub> <mrow> <mi> σ </mi> </mrow> <mrow> <mi> b </mi> <mover> <mrow> <mi> b </mi> </mrow> <mrow> <mo> ¯ </mo> </mrow> </mover> <mo> → </mo> <msup> <mrow> <mi> μ </mi> </mrow> <mrow> <mo> ± </mo> </mrow> </msup> <msup> <mrow> <mi> μ </mi> </mrow> <mrow> <mo> ± </mo> </mrow> </msup> </mrow> </msub> <mo> / </mo> <mi> d </mi> <mi> y </mi> <mo> = </mo> <mn> 0.16 </mn> <mo> ± </mo> <mn> 0.01 </mn> <mtext> </mtext> <mo> ( </mo> <mrow> <mi> stat </mi> </mrow> <mo> ) </mo> <mo> ± </mo> <mn> 0.02 </mn> <mtext> </mtext> <mo> ( </mo> <mrow> <mi> syst </mi> </mrow> <mo> ) </mo> <mo> ± </mo> <mn> 0.02 </mn> <mtext> </mtext> <mo> ( </mo> <mtext> global </mtext> <mo> ) </mo> <mtext> </mtext> <mtext> </mtext> <mi> nb </mi> </mrow> </math> for like-sign muons in the rapidity and <math> <msub> <mi> p </mi> <mi> </mi> </msub> </math> ranges <math> <mn> 1.2 </mn><mo> < </mo><mo> | </mo><mi> y </mi><mo> | </mo><mo> < </mo><mn> 2.2 </mn> </math> and <math> <mrow> <msub> <mrow> <mi> p </mi> </mrow> <mrow> <mi> </mi> </mrow> </msub> <mo> > </mo> <mn> 1 </mn> <mtext> </mtext> <mtext> </mtext> <mi> GeV </mi> <mo> / </mo> <mi> c </mi> </mrow> </math>, and dimuon mass of <math> <mrow> <mn> 5 </mn> <mi> – </mi> <mn> 10 </mn> <mtext> </mtext> <mtext> </mtext> <mi> GeV </mi> <mo> / </mo> <msup> <mrow> <mi> c </mi> </mrow> <mrow> <mn> 2 </mn> </mrow> </msup> </mrow> </math>. he extrapolated total cross section at this energy for <math> <mi> b </mi><mover> <mi> b </mi> <mo> ¯ </mo> </mover> </math> production is <math> <mrow> <mn> 13.1 </mn> <mo> ± </mo> <mn> 0.6 </mn> <mtext> </mtext> <mo> ( </mo> <mrow> <mi> stat </mi> </mrow> <mo> ) </mo> <mo> ± </mo> <mn> 1.5 </mn> <mtext> </mtext> <mo> ( </mo> <mrow> <mi> syst </mi> </mrow> <mo> ) </mo> <mo> ± </mo> <mn> 2.7 </mn> <mtext> </mtext> <mo> ( </mo> <mtext> global </mtext> <mo> ) </mo> <mtext> </mtext> <mi> μ </mi> <mi mathvariant="normal"> b </mi> </mrow> </math>. he total cross section is compared to a perturbative quantum chromodynamics calculation and is consistent within uncertainties. he azimuthal opening angle between muon pairs from <math> <mi> b </mi><mover> <mi> b </mi> <mo> ¯ </mo> </mover> </math> decays and their <math> <msub> <mi> p </mi> <mi> </mi> </msub> </math> distributions are compared to distributions generated using ps pythia6, which includes next-to-leading order processes. he azimuthal correlations and pair <math> <msub> <mi> p </mi> <mi> </mi> </msub> </math> distribution are not very well described by pythia calculations, but are still consistent within uncertainties. Flavor creation and flavor excitation subprocesses are favored over gluon splitting.</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.102.092002" target="_blank" rel="noopener" title="Link to document DOI" data-ostiid="1708976" data-product-type="Journal Article" data-product-subtype="PA" >https://doi.org/10.1103/PhysRevD.102.092002</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="/pages/biblio/1598616-reach-high-energy-lhc-gluinos-top-squarks-susy-models-light-higgsinos" itemprop="url">Reach of the high-energy LHC for gluinos and top squarks in SUSY models with light Higgsinos</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">Baer, Howard</span> ; <span class="author">Barger, Vernon</span> ; <span class="author">Gainer, James S.</span> ; <span class="author">...</span> <span class="text-muted pubdata"> - Physical Review D</span> </span> </div> <div class="abstract">We inves<a href='#' onclick='$(this).hide().next().show().next().show();return false;' style='margin-left:10px;'>more »</a><span style='display:none;'> tigate the top squark (stop) and gluino reach of the proposed 33 TeV energy upgrade of the Large Hadron Collider (LHC33) in the Minimal Supersymmetric Standard Model (MSSM) with light Higgsinos and relatively heavy electroweak gauginos. In our analysis, we assume that stops decay to Higgsinos via <math> <msub> <mover> <mi> t </mi> <mo> ˜ </mo> </mover> <mn> 1 </mn> </msub><mo> → </mo><mi> t </mi><msub> <mover> <mi> Z </mi> <mo> ˜ </mo> </mover> <mn> 1 </mn> </msub> </math>, <math> <msub> <mover> <mi> t </mi> <mo> ˜ </mo> </mover> <mn> 1 </mn> </msub><mo> → </mo><mi> t </mi><msub> <mover> <mi> Z </mi> <mo> ˜ </mo> </mover> <mn> 2 </mn> </msub> </math>, and <math> <msub> <mover> <mi> t </mi> <mo> ˜ </mo> </mover> <mn> 1 </mn> </msub><mo> → </mo><mi> b </mi><msub> <mover> <mi> W </mi> <mo> ˜ </mo> </mover> <mn> 1 </mn> </msub> </math> with branching fractions in the ratio <math> <mrow> <mrow> <mn> 1 </mn> <mo> : </mo> <mn> 1 </mn> </mrow> <mo> : </mo> <mn> 2 </mn> </mrow> </math> (expected if the decay occurs dominantly via the superpotential Yukawa coupling), while gluinos decay via <math> <mover> <mi> g </mi> <mo> ˜ </mo> </mover><mo> → </mo><mi> t </mi><msub> <mover> <mi> t </mi> <mo> ˜ </mo> </mover> <mn> 1 </mn> </msub> </math> or via three-body decays to third-generation quarks plus Higgsinos. These decay patterns are motivated by models of natural supersymmetry where Higgsinos are expected to be close in mass to <math> <msub> <mi> m </mi> <mi> Z </mi> </msub> </math>, but gluinos may be as heavy as 5–6 TeV, and stops may have masses up to <math> <mo> ~ </mo><mn> 3 </mn><mtext></mtext><mtext></mtext><mi> TeV </mi> </math>. We devise cuts to optimize the signals from stop and gluino pair production at LHC33. We find that experiments at LHC33 should be able to discover stops with <math> <mo> > </mo><mn> 5 </mn><mi> σ </mi> </math> significance if <math> <mrow> <msub> <mrow> <mi> m </mi> </mrow> <mrow> <msub> <mrow> <mover> <mrow> <mi> t </mi> </mrow> <mrow> <mo> ˜ </mo> </mrow> </mover> </mrow> <mrow> <mn> 1 </mn> </mrow> </msub> </mrow> </msub> <mo> < </mo> <mn> 2.3 </mn> </mrow> </math> (2.8) [3.2] TeV for an integrated luminosity of 0.3 (1) <math> <mrow> <mo> [ </mo> <mn> 3 </mn> <mo> ] </mo> <mtext></mtext> <mtext></mtext> <msup> <mrow> <mi> ab </mi> </mrow> <mrow> <mo> - </mo> <mn> 1 </mn> </mrow> </msup> </mrow> </math>. The corresponding reach for gluinos extends to 5 (5.5) [6] TeV. These findings imply that experiments at LHC33 should be able to discover at least one of the stop or gluino pair signals even with an integrated luminosity of <math> <mrow> <mn> 0.3 </mn> <mtext></mtext> <mtext></mtext> <msup> <mrow> <mi> ab </mi> </mrow> <mrow> <mo> - </mo> <mn> 1 </mn> </mrow> </msup> </mrow> </math> for natural supersymmetry models with no worse than 3% electroweak fine-tuning and quite likely both gluinos and stops for an integrated luminosity of <math> <mrow> <mn> 3 </mn> <mtext></mtext> <mtext></mtext> <msup> <mrow> <mi> ab </mi> </mrow> <mrow> <mo> - </mo> <mn> 1 </mn> </mrow> </msup> </mrow> </math>.</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 22<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.96.115008" target="_blank" rel="noopener" title="Link to document DOI" data-ostiid="1598616" data-product-type="Journal Article" data-product-subtype="AM" >https://doi.org/10.1103/PhysRevD.96.115008</a></span></li> <li class="pure-menu-item"><span class="item-info-ftlink"><a class="misc fulltext-link " href="/pages/servlets/purl/1598616" title="Link to document media" target="_blank" rel="noopener" data-ostiid="1598616" 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="6" /><div class="item-info"> <h2 class="title" itemprop="name headline"><a href="/pages/biblio/1598585-probing-squeezed-bino-slepton-spectra-large-hadron-collider" itemprop="url">Probing squeezed bino-slepton spectra with the Large Hadron Collider</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">Dutta, Bhaskar</span> ; <span class="author">Fantahun, Kebur</span> ; <span class="author">Fernando, Ashen</span> ; <span class="author">...</span> <span class="text-muted pubdata"> - Physical Review D</span> </span> </div> <div class="abstract">In<a href='#' onclick='$(this).hide().next().show().next().show();return false;' style='margin-left:10px;'>more »</a><span style='display:none;'> this study, we consider a minimal supersymmetric Standard Model scenario in which the only light superparticles are a binolike dark matter candidate and a nearly degenerate slepton. It is notoriously difficult to probe this scenario at the Large Hadron Collider (LHC), because the slepton pair-production process yields a final state with soft leptons and small missing transverse energy. We study this scenario in the region of parameter space where the mass difference between the lightest neutralino and the lightest slepton ( <math> <mi mathvariant="normal"> Δ </mi><mi> m </mi> </math>) is <math> <mo> ≲ </mo><mn> 60 </mn><mtext> </mtext><mtext> </mtext><mi> GeV </mi> </math>, focusing on the process in which an additional radiated jet provides a transverse boost to the slepton pair. We then utilize the angular separation of the leptons from each other and from the missing transverse energy, as well as the angular separation between the jet and the missing transverse energy, to distinguish signal from background events. We also use the reconstructed ditau mass, the <math> <mi> cos </mi><msubsup> <mi> θ </mi> <mrow> <msub> <mo> ℓ </mo> <mn> 1 </mn> </msub> <msub> <mo> ℓ </mo> <mn> 2 </mn> </msub> </mrow> <mo> * </mo> </msubsup> </math> variable, and for larger <math> <mi mathvariant="normal"> Δ </mi><mi> m </mi> </math>, a lower bound on the lepton <math> <msub> <mi> p </mi> <mi> T </mi> </msub> </math>. These cuts can dramatically improve both signal sensitivity and the signal-to-background ratio, permitting discovery at the LHC with reasonable integrated luminosity over the interesting region of parameter space. Using our search strategy the LHC will be able to exclude <math> <msub> <mi> m </mi> <mover> <mi> μ </mi> <mo> ˜ </mo> </mover> </msub><mo> ≈ </mo><mn> 200 </mn><mtext> </mtext><mtext> </mtext><mi> GeV </mi> </math> for <math> <mi mathvariant="normal"> Δ </mi><mi> m </mi><mo> ≲ </mo><mn> 60 </mn><mtext> </mtext><mtext> </mtext><mi> GeV </mi> </math> at <math> <mrow> <mn> 1.5 </mn> <mi> – </mi> <mn> 3 </mn> <mi> σ </mi> </mrow> </math> with <math> <mrow> <mn> 1000 </mn> <mtext> </mtext> <mtext> </mtext> <msup> <mrow> <mi> fb </mi> </mrow> <mrow> <mo> - </mo> <mn> 1 </mn> </mrow> </msup> </mrow> </math> of integrated luminosity. Although we focus on a particular model, the results generalize to a variety of scenarios in which the dark matter and a leptonic partner are nearly degenerate in mass, and especially to scenarios featuring a scalar mediator.</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/10.1103/PhysRevD.96.075037" target="_blank" rel="noopener" title="Link to document DOI" data-ostiid="1598585" data-product-type="Journal Article" data-product-subtype="AM" >https://doi.org/10.1103/PhysRevD.96.075037</a></span></li> <li class="pure-menu-item"><span class="item-info-ftlink"><a class="misc fulltext-link " href="/pages/servlets/purl/1598585" title="Link to document media" target="_blank" rel="noopener" data-ostiid="1598585" 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="8" /><div class="item-info"> <h2 class="title" itemprop="name headline"><a href="/pages/biblio/1376272-study-jet-quenching-z+jet-correlations-pb-pb-pp-collisions-snn" itemprop="url">Study of Jet Quenching with <math> <mrow> <mi> Z </mi> <mo> + </mo> <mrow> <mtext> jet </mtext> </mrow> </mrow> </math> Correlations in Pb-Pb and <math> <mi> p </mi><mi> p </mi> </math> Collisions at <math> <mrow> <msub> <mrow> <msqrt> <mrow> <mi> s </mi> </mrow> </msqrt> </mrow> <mrow> <mi> N </mi> <mi> N </mi> </mrow> </msub> <mo> = </mo> <mn> 5.02 </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 Letters</span> </span> </div> <div class="abstract">T<a href='#' onclick='$(this).hide().next().show().next().show();return false;' style='margin-left:10px;'>more »</a><span style='display:none;'> he production of jets in association with <math> <mi> Z </mi> </math> bosons, reconstructed via the <math> <mrow> <msup> <mrow> <mi> μ </mi> </mrow> <mrow> <mo> + </mo> </mrow> </msup> <msup> <mrow> <mi> μ </mi> </mrow> <mrow> <mo> – </mo> </mrow> </msup> </mrow> </math> and <math> <msup> <mi> e </mi> <mo> + </mo> </msup><msup> <mi> e </mi> <mo> – </mo> </msup> </math> decay channels, is studied in <math> <mi> p </mi><mi> p </mi> </math> and, for the first time, in Pb-Pb collisions. Both data samples were collected by the CMS experiment at the LHC, at a nucleon-nucleon center-of-mass energy of 5.02 eV. he Pb-Pb collisions were analyzed in the 0%–30% centrality range. he back-to-back azimuthal alignment was studied in both <math> <mi> p </mi><mi> p </mi> </math> and Pb-Pb collisions for <math> <mi> Z </mi> </math> bosons with transverse momentum <math> <mrow> <msubsup> <mrow> <mi> p </mi> </mrow> <mrow> <mi mathvariant="normal"> </mi> </mrow> <mrow> <mi> Z </mi> </mrow> </msubsup> <mo> > </mo> <mn> 60 </mn> <mtext> </mtext> <mtext> </mtext> <mi> GeV </mi> <mo> / </mo> <mi> c </mi> </mrow> </math> and a recoiling jet with <math> <msubsup> <mi> p </mi> <mi mathvariant="normal"> </mi> <mtext> jet </mtext> </msubsup><mo> > </mo><mn> 30 </mn><mtext> </mtext><mtext> </mtext><mi> GeV </mi><mo> / </mo><mi> c </mi> </math>. he <math> <msub> <mi> p </mi> <mi mathvariant="normal"> </mi> </msub> </math> imbalance <math> <msub> <mi> x </mi> <mrow> <mi> j </mi> <mi> Z </mi> </mrow> </msub><mo> = </mo><msubsup> <mi> p </mi> <mi mathvariant="normal"> </mi> <mtext> jet </mtext> </msubsup><mo> / </mo><msubsup> <mi> p </mi> <mi mathvariant="normal"> </mi> <mi> Z </mi> </msubsup> </math>, as well as the average number of jet partners per <math> <mrow> <mi> Z </mi> </mrow> </math>, <math> <mrow> <msub> <mrow> <mi> R </mi> </mrow> <mrow> <mi> j </mi> <mi> Z </mi> </mrow> </msub> </mrow> </math>, was studied in intervals of <math> <mrow> <msubsup> <mrow> <mi> p </mi> </mrow> <mrow> <mi mathvariant="normal"> </mi> </mrow> <mrow> <mi> Z </mi> </mrow> </msubsup> </mrow> </math>. he <math> <msub> <mi> R </mi> <mrow> <mi> j </mi> <mi> Z </mi> </mrow> </msub> </math> is found to be smaller in Pb-Pb than in <math> <mi> p </mi><mi> p </mi> </math> collisions, which suggests that in Pb-Pb collisions a larger fraction of partons associated with the <math> <mi> Z </mi> </math> bosons fall below the <math> <mn> 30 </mn><mtext> </mtext><mtext> </mtext><mi> GeV </mi><mo> / </mo><mi> c </mi> </math> <math> <msubsup> <mi> p </mi> <mi mathvariant="normal"> </mi> <mtext> jet </mtext> </msubsup> </math> threshold because they lose energy.</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 20<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/PhysRevLett.119.082301" target="_blank" rel="noopener" title="Link to document DOI" data-ostiid="1376272" data-product-type="Journal Article" data-product-subtype="PA" >https://doi.org/10.1103/PhysRevLett.119.082301</a></span></li> </ul> </div> </div> </div> <div class="clearfix"></div> </div> </li> </ul> </aside> </div> </section> </div> <div class="col-sm-3 order-sm-3"> <ul class="nav nav-stacked"> <li class="active"><a class="tab-nav disabled" data-tab="related" style="color: #636c72 !important; 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