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Title: Search for R-parity violating decays of a top squark in proton–proton collisions at $$\sqrt{s} =$$ 8 TeV

The results of a search for a supersymmetric partner of the top quark (top squark), pair-produced in proton-proton collisions at $$\sqrt{s} =$$ 8 TeV, are presented. The search, which focuses on R-parity violating, chargino-mediated decays of the top squark, is performed in final states with low missing transverse momentum, two oppositely charged electrons or muons, and at least five jets. The analysis uses a data sample corresponding to an integrated luminosity of 19.7 fb$$^{-1}$$ collected with the CMS detector at the LHC in 2012. The data are found to be in agreement with the standard model expectation, and upper limits are placed on the top squark pair production cross section at 95% confidence level. Assuming a 100% branching fraction for the top squark decay chain, $$ \mathrm{ \tilde{t} \to t \tilde{\chi}^{\pm}_1,\, \tilde{\chi}^{\pm}_1 \to \ell^\pm+jj } $$, top squark masses less than 890 (1000) GeV for the electron (muon) channel are excluded for the first time in models with a single nonzero R-parity violating coupling $$\lambda^{\prime}_{ijk}$$ $$(i,j,k \leq 2)$$, where $i,j,k$ correspond to the three generations.
  1. et al.
Publication Date:
OSTI Identifier:
Report Number(s):
FERMILAB-PUB-16-059-CMS; CMS-EXO-14-013; CERN-PH-EP-2016-005; CERN-EP-2016-005; arXiv:1602.04334
Journal ID: ISSN 0370-2693; 1421645
Grant/Contract Number:
AC02-07CH11359; SC0007968
Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 760; Journal Issue: C; Journal ID: ISSN 0370-2693
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); Princeton Univ., NJ (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Orgs:
CMS Collaboration; CMS Collaboration at CERN
Country of Publication:
United States
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CMS; physics; supersymmetry; leptons; low missing transverse energy