Search for direct pair production of scalar top quarks in the single- and dilepton channels in proton-proton collisions at $\sqrt{s}$ = 8 TeV

Khachatryan, Vardan

doi:10.1007/JHEP07(2016)027

Title: Search for direct pair production of scalar top quarks in the single- and dilepton channels in proton-proton collisions at $$\sqrt{s}$$ = 8 TeV

Abstract

Results are reported from a search for the top squark $$ \tilde{t}_1 $$, the lighter of the two supersymmetric partners of the top quark. The data sample corresponds to 19.7 fb$$^{-1}$$ of proton-proton collisions at $$\sqrt{s} =$$ 8 TeV collected with the CMS detector at the LHC. The search targets $$ \tilde{t}_1 \to \mathrm{b} \tilde{\chi}^{\pm}_1$$ and $$ \tilde{t}_1 \to \mathrm{t}^{(*)} \tilde{\chi}^0_1$$ decay modes, where $$\tilde{\chi}^{\pm}_1$$ and $$\tilde{\chi}^0_1$$ are the lightest chargino and neutralino, respectively. The reconstructed final state consists of jets, b jets, missing transverse energy, and either one or two leptons. Leading backgrounds are determined from data. No significant excess in data is observed above the expectation from standard model processes. The results exclude a region of the two-dimensional plane of possible $$ \tilde{t}_1 $$ and $$\tilde{\chi}^0_1 $$ masses. The highest excluded $$ \tilde{t}_1 $$ and $$ \tilde{\chi}^0_1$$ masses are about 700 GeV and 250 GeV, respectively.

Authors:

Khachatryan, Vardan ^[1]

Yerevan Physics Inst. (YerPhI), Yerevan (Armenia). et al.

Publication Date:: Fri Jul 01 00:00:00 EDT 2016

Research Org.:: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Org.:: USDOE Office of Science (SC), High Energy Physics (HEP)

Contributing Org.:: CMS Collaboration

OSTI Identifier:: 1244497

Report Number(s):: CMS-SUS-14-015; CERN-PH-EP-2016-004; CERN-EP-2016-004; arXiv:1602.03169; FERMILAB-PUB-16-062-CMS
Journal ID: ISSN 1029-8479; 1420556; TRN: US1601637

Grant/Contract Number:: AC02-07CH11359

Resource Type:: Accepted Manuscript

Journal Name:: Journal of High Energy Physics (Online)

Additional Journal Information:: Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2016; Journal Issue: 7; Journal ID: ISSN 1029-8479

Publisher:: Springer Berlin

Country of Publication:: United States

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Hadron-Hadron scattering (experiments); supersymmetry; top quark

Citation Formats


                    Khachatryan, Vardan. Search for direct pair production of scalar top quarks in the single- and dilepton channels in proton-proton collisions at $\sqrt{s}$ = 8 TeV.  United States: N. p., 2016. 
Web.  doi:10.1007/JHEP07(2016)027.

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                    Khachatryan, Vardan. Search for direct pair production of scalar top quarks in the single- and dilepton channels in proton-proton collisions at $\sqrt{s}$ = 8 TeV.  United States.  https://doi.org/10.1007/JHEP07(2016)027

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                    Khachatryan, Vardan. Fri .  
"Search for direct pair production of scalar top quarks in the single- and dilepton channels in proton-proton collisions at $\sqrt{s}$ = 8 TeV".  United States.  https://doi.org/10.1007/JHEP07(2016)027.  https://www.osti.gov/servlets/purl/1244497.

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@article{osti_1244497,

  title        = {Search for direct pair production of scalar top quarks in the single- and dilepton channels in proton-proton collisions at $\sqrt{s}$ = 8 TeV},

  author       = {Khachatryan, Vardan},

  abstractNote = {Results are reported from a search for the top squark $ \tilde{t}_1 $, the lighter of the two supersymmetric partners of the top quark. The data sample corresponds to 19.7 fb$^{-1}$ of proton-proton collisions at $\sqrt{s} =$ 8 TeV collected with the CMS detector at the LHC. The search targets $ \tilde{t}_1 \to \mathrm{b} \tilde{\chi}^{\pm}_1$ and $ \tilde{t}_1 \to \mathrm{t}^{(*)} \tilde{\chi}^0_1$ decay modes, where $\tilde{\chi}^{\pm}_1$ and $\tilde{\chi}^0_1$ are the lightest chargino and neutralino, respectively. The reconstructed final state consists of jets, b jets, missing transverse energy, and either one or two leptons. Leading backgrounds are determined from data. No significant excess in data is observed above the expectation from standard model processes. The results exclude a region of the two-dimensional plane of possible $ \tilde{t}_1 $ and $\tilde{\chi}^0_1 $ masses. The highest excluded $ \tilde{t}_1 $ and $ \tilde{\chi}^0_1$ masses are about 700 GeV and 250 GeV, respectively.},

  doi          = {10.1007/JHEP07(2016)027},

  journal      = {Journal of High Energy Physics (Online)},

  number       = 7,

  volume       = 2016,

  place        = {United States},

  year         = {Fri Jul 01 00:00:00 EDT 2016},

  month        = {Fri Jul 01 00:00:00 EDT 2016}

}

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Works referenced in this record:

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Similar Records

Title: Search for direct pair production of scalar top quarks in the single- and dilepton channels in proton-proton collisions at $$\sqrt{s}$$ = 8 TeV

Abstract

Citation Formats

Search for the Supersymmetric Partner of the Top Quark in Dilepton Events from p p ¯ Collisions at s = 1.8 T e V journal, June 2003

Search for 3- and 4-body decays of the scalar top quark in pp̄ collisions at s= 1.8 TeV journal, February 2004

New Generation of Parton Distributions with Uncertainties from Global QCD Analysis journal, July 2002

A positive-weight next-to-leading-order Monte Carlo for heavy flavour hadroproduction journal, September 2007

The anti- k t jet clustering algorithm journal, April 2008

The Fast Simulation of the CMS Detector at LHC journal, December 2011

The catchment area of jets journal, April 2008

ATLAS Run 1 searches for direct pair production of third-generation squarks at the Large Hadron Collider journal, October 2015

Search for top-squark pair production in the single-lepton final state in pp collisions at $\sqrt{s}=8\ \mathrm{TeV}$ journal, December 2013

Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC journal, September 2012

PYTHIA 6.4 physics and manual journal, May 2006

Light scalar top quarks and supersymmetric dark matter journal, July 2000

Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC journal, September 2012

Squark and Gluino Hadroproduction journal, June 2011

Confidence level computation for combining searches with small statistics journal, September 1999

Search for pair production of the scalar top quark in muon+tau final states journal, April 2012

Threshold Resummation for Squark-Antisquark and Gluino-Pair Production at the LHC journal, March 2009

Measuring masses of semi-invisibly decaying particle pairs produced at hadron colliders journal, September 1999

Search for the supersymmetric partner of the top quark in p p ¯ collisions at s = 1.96 TeV journal, November 2010

Dark matter, light top squarks, and electroweak baryogenesis journal, July 2004

Pileup subtraction using jet areas journal, January 2008

Geant4—a simulation toolkit journal, July 2003

Presentation of search results: the CL s technique journal, September 2002

Using subsystem M T 2 for complete mass determinations in decay chains with missing energy at hadron colliders journal, March 2009

Soft-gluon resummation for squark and gluino hadroproduction journal, December 2009

Squark and gluino production at hadron colliders journal, May 1997

Performance of CMS muon reconstruction in pp collision events at √s = 7 TeV journal, October 2012

Performance of electron reconstruction and selection with the CMS detector in proton-proton collisions at √ s = 8 TeV journal, June 2015

Identification of b-quark jets with the CMS experiment journal, April 2013

Performance of the CMS missing transverse momentum reconstruction in pp data at √ s = 8 TeV journal, February 2015

Determination of jet energy calibration and transverse momentum resolution in CMS journal, November 2011

Observation of a new Boson at a mass of 125 gev with the cms Experiment at the lhc conference, March 2015

Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC text, January 2018

Search for top-squark pair production in the single-lepton final state in pp collisions at $\sqrt{s}$ = 8 TeV text, January 2013

The anti-k_t jet clustering algorithm text, January 2008

Soft-gluon resummation for squark and gluino hadroproduction text, January 2009

Squark and gluino hadroproduction text, January 2011

MadGraph 5 : Going Beyond text, January 2011

New Generation of Parton Distributions with Uncertainties from Global QCD Analysis text, January 2002

Light Scalar Top Quarks and Supersymmetric Dark Matter text, January 1999

Search for supersymmetry in the all-hadronic final state using top quark tagging in pp collisions at √s =13 TeV text, January 2017

Search for the Supersymmetric Partner of the Top Quark in Dilepton Events from $p \bar{p}$ Collisions at $\sqrt{s} = 1.8 T e V$
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Search for 3- and 4-body decays of the scalar top quark in pp̄ collisions at s= 1.8 TeV
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The anti- k _t jet clustering algorithm
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The Fast Simulation of the CMS Detector at LHC
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Search for top-squark pair production in the single-lepton final state in pp collisions at $\sqrt{s}=8\ \mathrm{TeV}$
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Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
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Confidence level computation for combining searches with small statistics
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Search for pair production of the scalar top quark in muon+tau final states
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Observation of a new Boson at a mass of 125 gev with the cms Experiment at the lhc
conference, March 2015

Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
text, January 2018

Search for top-squark pair production in the single-lepton final state in pp collisions at $\sqrt{s}$ = 8 TeV
text, January 2013

The anti-k_t jet clustering algorithm
text, January 2008

Soft-gluon resummation for squark and gluino hadroproduction
text, January 2009

Squark and gluino hadroproduction
text, January 2011

MadGraph 5 : Going Beyond
text, January 2011

New Generation of Parton Distributions with Uncertainties from Global QCD Analysis
text, January 2002

Light Scalar Top Quarks and Supersymmetric Dark Matter
text, January 1999

Search for supersymmetry in the all-hadronic final state using top quark tagging in pp collisions at √s =13 TeV
text, January 2017