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 · Fri Jul 01 00:00:00 EDT 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 Lab. (FNAL), Batavia, IL (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Argonne National Lab. (ANL), Argonne, IL (United States)

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

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; TRN: US1601637

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

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

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