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

Journal Article · 01 July 2016 · Journal of High Energy Physics (Online)

DOI: https://doi.org/10.1007/JHEP07(2016)027 · OSTI ID:1244497

Khachatryan, Vardan ^[1]

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

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.

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

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)

Contributing Organization:: CMS Collaboration

Grant/Contract Number:: AC02-07CH11359

OSTI ID:: 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; 1420556

Journal Information:: Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 7 Vol. 2016; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

References (44)

MadGraph 5: going beyond Alwall, Johan; Herquet, Michel; Maltoni, Fabio Journal of High Energy Physics, Vol. 2011, Issue 6 https://doi.org/10.1007/JHEP06(2011)128	journal	June 2011
Geant4—a simulation toolkit Agostinelli, S.; Allison, J.; Amako, K. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 506, Issue 3 https://doi.org/10.1016/S0168-9002(03)01368-8	journal	July 2003
Confidence level computation for combining searches with small statistics Junk, Thomas Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 434, Issue 2-3 https://doi.org/10.1016/S0168-9002(99)00498-2	journal	September 1999
Measuring masses of semi-invisibly decaying particle pairs produced at hadron colliders Lester, C. G.; Summers, D. J. Physics Letters B, Vol. 463, Issue 1 https://doi.org/10.1016/S0370-2693(99)00945-4	journal	September 1999
Squark and gluino production at hadron colliders Beenakker, W.; Höpker, R.; Spira, M. Nuclear Physics B, Vol. 492, Issue 1-2 https://doi.org/10.1016/S0550-3213(97)80027-2	journal	May 1997
Search for 3- and 4-body decays of the scalar top quark in pp̄ collisions at s= 1.8 TeV Abazov, V. M.; Abbott, B.; Abdesselam, A. Physics Letters B, Vol. 581, Issue 3-4 https://doi.org/10.1016/j.physletb.2003.12.001	journal	February 2004
Pileup subtraction using jet areas Cacciari, Matteo; Salam, Gavin P. Physics Letters B, Vol. 659, Issue 1-2 https://doi.org/10.1016/j.physletb.2007.09.077	journal	January 2008
Search for the lightest scalar top quark in events with two leptons in pp¯ collisions at s=1.96 TeV Abazov, V. M.; Abbott, B.; Abolins, M. Physics Letters B, Vol. 659, Issue 3 https://doi.org/10.1016/j.physletb.2007.11.086	journal	January 2008
Search for the lightest scalar top quark in events with two leptons in pp¯ collisions at s=1.96 TeV Abazov, V. M.; Abbott, B.; Abolins, M. Physics Letters B, Vol. 675, Issue 3-4 https://doi.org/10.1016/j.physletb.2009.04.039	journal	May 2009
Combined results of searches for the standard model Higgs boson in pp collisions at s=7 TeV Chatrchyan, S.; Khachatryan, V.; Sirunyan, A. M. Physics Letters B, Vol. 710, Issue 1 https://doi.org/10.1016/j.physletb.2012.02.064	journal	March 2012
Search for pair production of the scalar top quark in muon+tau final states Abazov, V. M.; Abbott, B.; Acharya, B. S. Physics Letters B, Vol. 710, Issue 4-5 https://doi.org/10.1016/j.physletb.2012.03.028	journal	April 2012
Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC Aad, G.; Abajyan, T.; Abbott, B. Physics Letters B, Vol. 716, Issue 1 https://doi.org/10.1016/j.physletb.2012.08.020	journal	September 2012
Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC Chatrchyan, S.; Khachatryan, V.; Sirunyan, A. M. Physics Letters B, Vol. 716, Issue 1 https://doi.org/10.1016/j.physletb.2012.08.021	journal	September 2012
Presentation of search results: the CL _s technique Read, A. L. Journal of Physics G: Nuclear and Particle Physics, Vol. 28, Issue 10 https://doi.org/10.1088/0954-3899/28/10/313	journal	September 2002
New Generation of Parton Distributions with Uncertainties from Global QCD Analysis Pumplin, Jonathan; Stump, Daniel Robert; Huston, Joey Journal of High Energy Physics, Vol. 2002, Issue 07 https://doi.org/10.1088/1126-6708/2002/07/012	journal	July 2002
PYTHIA 6.4 physics and manual Sjöstrand, Torbjörn; Mrenna, Stephen; Skands, Peter Journal of High Energy Physics, Vol. 2006, Issue 05 https://doi.org/10.1088/1126-6708/2006/05/026	journal	May 2006
A positive-weight next-to-leading-order Monte Carlo for heavy flavour hadroproduction Frixione, Stefano; Ridolfi, Giovanni; Nason, Paolo Journal of High Energy Physics, Vol. 2007, Issue 09 https://doi.org/10.1088/1126-6708/2007/09/126	journal	September 2007
The catchment area of jets Cacciari, Matteo; Salam, Gavin P.; Soyez, Gregory Journal of High Energy Physics, Vol. 2008, Issue 04 https://doi.org/10.1088/1126-6708/2008/04/005	journal	April 2008
The anti- k _t jet clustering algorithm Cacciari, Matteo; Salam, Gavin P.; Soyez, Gregory Journal of High Energy Physics, Vol. 2008, Issue 04 https://doi.org/10.1088/1126-6708/2008/04/063	journal	April 2008
Using subsystem M _{T 2} for complete mass determinations in decay chains with missing energy at hadron colliders Burns, Michael; Kong, Kyoungchul; Matchev, Konstantin T. Journal of High Energy Physics, Vol. 2009, Issue 03 https://doi.org/10.1088/1126-6708/2009/03/143	journal	March 2009
Soft-gluon resummation for squark and gluino hadroproduction Beenakker, Wim; Brensing, Silja; Krämer, Michael Journal of High Energy Physics, Vol. 2009, Issue 12 https://doi.org/10.1088/1126-6708/2009/12/041	journal	December 2009
The Fast Simulation of the CMS Detector at LHC Abdullin, S.; Azzi, P.; Beaudette, F. Journal of Physics: Conference Series, Vol. 331, Issue 3 https://doi.org/10.1088/1742-6596/331/3/032049	journal	December 2011
Performance of the CMS missing transverse momentum reconstruction in pp data at √ s = 8 TeV collaboration, The CMS Journal of Instrumentation, Vol. 10, Issue 02 https://doi.org/10.1088/1748-0221/10/02/P02006	journal	February 2015
Performance of electron reconstruction and selection with the CMS detector in proton-proton collisions at √ s = 8 TeV Journal of Instrumentation, Vol. 10, Issue 06, p. P06005-P06005 https://doi.org/10.1088/1748-0221/10/06/P06005	journal	June 2015
Determination of jet energy calibration and transverse momentum resolution in CMS collaboration, The CMS Journal of Instrumentation, Vol. 6, Issue 11 https://doi.org/10.1088/1748-0221/6/11/P11002	journal	November 2011
Performance of CMS muon reconstruction in pp collision events at √s = 7 TeV collaboration, The CMS Journal of Instrumentation, Vol. 7, Issue 10 https://doi.org/10.1088/1748-0221/7/10/P10002	journal	October 2012
Identification of b-quark jets with the CMS experiment collaboration, The CMS Journal of Instrumentation, Vol. 8, Issue 04 https://doi.org/10.1088/1748-0221/8/04/P04013	journal	April 2013
Light scalar top quarks and supersymmetric dark matter Boehm, Céline; Djouadi, Abdelhak; Drees, Manuel Physical Review D, Vol. 62, Issue 3 https://doi.org/10.1103/PhysRevD.62.035012	journal	July 2000
Dark matter, light top squarks, and electroweak baryogenesis Balázs, C.; Carena, M.; Wagner, C. E. M. Physical Review D, Vol. 70, Issue 1 https://doi.org/10.1103/PhysRevD.70.015007	journal	July 2004
Search for the supersymmetric partner of the top quark in p p ¯ collisions at s = 1.96 TeV Aaltonen, T.; Álvarez González, B.; Amerio, S. Physical Review D, Vol. 82, Issue 9 https://doi.org/10.1103/PhysRevD.82.092001	journal	November 2010
Threshold Resummation for Squark-Antisquark and Gluino-Pair Production at the LHC Kulesza, A.; Motyka, L. Physical Review Letters, Vol. 102, Issue 11 https://doi.org/10.1103/PhysRevLett.102.111802	journal	March 2009
Search for the Supersymmetric Partner of the Top Quark in Dilepton Events from p p ¯ Collisions at s = 1.8 T e V Acosta, D.; Affolder, T.; Akimoto, H. Physical Review Letters, Vol. 90, Issue 25 https://doi.org/10.1103/PhysRevLett.90.251801	journal	June 2003
Search for top-squark pair production in the single-lepton final state in pp collisions at $\sqrt{s}=8\ \mathrm{TeV}$ Chatrchyan, S.; Khachatryan, V.; Sirunyan, A. M. The European Physical Journal C, Vol. 73, Issue 12 https://doi.org/10.1140/epjc/s10052-013-2677-2	journal	December 2013
ATLAS Run 1 searches for direct pair production of third-generation squarks at the Large Hadron Collider Aad, G.; Abbott, B.; Abdallah, J. The European Physical Journal C, Vol. 75, Issue 10 https://doi.org/10.1140/epjc/s10052-015-3726-9	journal	October 2015
Observation of a new Boson at a mass of 125 gev with the cms Experiment at the lhc Mariotti, Chiara Proceedings of the MG13 Meeting on General Relativity, The Thirteenth Marcel Grossmann Meeting https://doi.org/10.1142/9789814623995_0019	conference	March 2015
Squark and Gluino Hadroproduction Beenakker, Wim; Brensing, Silja; KrÄMer, Michael International Journal of Modern Physics A, Vol. 26, Issue 16 https://doi.org/10.1142/S0217751X11053560	journal	June 2011
Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC Akgun, B.; Azzolini, V.; Calamba, A. Figshare https://doi.org/10.1184/r1/6507686.v1	text	January 2018
Search for top-squark pair production in the single-lepton final state in pp collisions at $\sqrt{s}$ = 8 TeV Chatrchyan, S.; Khachatryan, Vardan; Sirunyan, Albert M. Deutsches Elektronen-Synchrotron, DESY, Hamburg https://doi.org/10.3204/desy-2014-01039	text	January 2013
The anti-k_t jet clustering algorithm Cacciari, Matteo; Salam, Gavin P.; Soyez, Gregory arXiv https://doi.org/10.48550/arxiv.0802.1189	text	January 2008
Soft-gluon resummation for squark and gluino hadroproduction Beenakker, Wim; Brensing, Silja; Krämer, Michael arXiv https://doi.org/10.48550/arxiv.0909.4418	text	January 2009
Squark and gluino hadroproduction Beenakker, W.; Brensing, S.; Krämer, M. arXiv https://doi.org/10.48550/arxiv.1105.1110	text	January 2011
MadGraph 5 : Going Beyond Alwall, Johan; Herquet, Michel; Maltoni, Fabio arXiv https://doi.org/10.48550/arxiv.1106.0522	text	January 2011
New Generation of Parton Distributions with Uncertainties from Global QCD Analysis Pumplin, J.; Stump, D. R.; Huston, J. arXiv https://doi.org/10.48550/arxiv.hep-ph/0201195	text	January 2002
Light Scalar Top Quarks and Supersymmetric Dark Matter Boehm, C.; Djouadi, A.; Drees, M. arXiv https://doi.org/10.48550/arxiv.hep-ph/9911496	text	January 1999

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