Search for direct pair production of supersymmetric top quarks decaying to all-hadronic final states in pp collisions at √s = 8 TeV

Khachatryan, Vardan

doi:10.1140/epjc/s10052-016-4292-5

Title: Search for direct pair production of supersymmetric top quarks decaying to all-hadronic final states in pp collisions at √s = 8 TeV

Journal Article · 16 August 2016 · European Physical Journal. C, Particles and Fields

DOI: https://doi.org/10.1140/epjc/s10052-016-4292-5 · OSTI ID:1288738

Khachatryan, Vardan ^[1]

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

Here, results are reported from a search for the pair production of top squarks, the supersymmetric partners of top quarks, in final states with jets and missing transverse momentum. The data sample used in this search was collected by the CMS detector and corresponds to an integrated luminosity of 18.9 fb^–1 of proton-proton collisions at a centre-of-mass energy of 8 TeV produced by the LHC. The search features novel background suppression and prediction methods, including a dedicated top quark pair reconstruction algorithm. The data are found to be in agreement with the predicted backgrounds. Exclusion limits are set in simplified supersymmetry models with the top squark decaying to jets and an undetected neutralino, either via a top quark or through a bottom quark and chargino. Models with the top squark decaying via a top quark are excluded for top squark masses up to 755 GeV in the case of neutralino masses below 200 GeV. For decays via a chargino, top squark masses up to 620 GeV are excluded, depending on the masses of the chargino and neutralino.

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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); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Rice Univ., Houston, TX (United States); Univ. of California, Santa Barbara, CA (United States)

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

Contributing Organization:: CMS Collaboration

Grant/Contract Number:: AC02-07CH11359; AC02-05CH11231; SC0010103; SC0011702

OSTI ID:: 1288738

Alternate ID(s):: OSTI ID: 1411640; OSTI ID: 1595947

Report Number(s):: FERMILAB-PUB-16-107-CMS; CMS-SUS-13-023; CERN-EP-2016-040; arXiv:1603.00765; 1425690

Journal Information:: European Physical Journal. C, Particles and Fields, Vol. 76, Issue 8; ISSN 1434-6044

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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A search for new phenomena in pp collisions at $$\sqrt{s} = 13\,\text {TeV} $$ s = 13 TeV in final states with missing transverse momentum and at least one jet using the $$\alpha _{\mathrm {T}}$$ α T variable Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A. The European Physical Journal C, Vol. 77, Issue 5 https://doi.org/10.1140/epjc/s10052-017-4787-8	journal	May 2017
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Search for direct top squark pair production in final states with two leptons in $$\sqrt{s} = 13$$ s = 13 TeV pp collisions with the ATLAS detector Aaboud, M.; Aad, G.; Abbott, B. The European Physical Journal C, Vol. 77, Issue 12 https://doi.org/10.1140/epjc/s10052-017-5445-x	journal	December 2017
Exploring the nearly degenerate stop region with sbottom decays An, Haipeng; Gu, Jiayin; Wang, Lian-Tao Deutsches Elektronen-Synchrotron, DESY, Hamburg https://doi.org/10.3204/pubdb-2016-05828	text	January 2016
Search for supersymmetry in the all-hadronic final state using top quark tagging in pp collisions at √s =13 TeV Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A. American Physical Society (APS) https://doi.org/10.5445/ir/1000073953	text	January 2017
Prospects for natural SUSY Kim, Jong Soo; Rolbiecki, Krzysztof; Ruiz, Roberto arXiv https://doi.org/10.48550/arxiv.1606.06738	text	January 2016
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