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Title: Search for supersymmetry in events with soft leptons, low jet multiplicity, and missing transverse energy in proton–proton collisions at $$\sqrt{s}$$ = 8 TeV

Results are presented from a search for supersymmetric particles in scenarios with a compressed mass spectrum. The data sample corresponds to 19.7 inverse femtobarns of proton-proton collisions recorded by the CMS experiment at √s = 8 TeV. The search targets top squark ($$\tilde{t}$$ pair production in scenarios with mass differences Δm = m($$\tilde{t}$$ – m($$\tilde{\chi}$$10) below the W-boson mass and with top-squark decays in the four-body mode ($$\tilde{t}$$ → blv$$\tilde{\chi}$$10), where the ($$\tilde{\chi}$$10) is assumed to be the lightest supersymmetric particle (LSP). The signature includes a high transverse momentum (pT) jet associated with initial-state radiation, one or two low-pT leptons, and significant missing transverse energy. The event yields observed in data are consistent with the expected background contributions from standard model processes. Limits are set on the cross section for top squark pair production as a function of the $$\tilde{t}$$ and LSP masses. Assuming a 100% branching fraction for the four-body decay mode, top-squark masses below 316 GeV are excluded for Δm = 25 GeV at 95% CL. Furthermore, the dilepton data are also interpreted under the assumption of chargino-neutralino production, with subsequent decays to sleptons or sneutrinos. Assuming a difference between the common $$\tilde{\chi}$$1+/$$\tilde{\chi}$$2+ mass and the LSP mass of 20 GeV and a τ-enriched decay scenario, masses in the range m( $$\tilde{\chi}$$1+) <307 GeVare excluded at 95% CL.
Authors:
 [1]
  1. Yerevan Physics Inst. (YerPhI), Yerevan (Armenia). et al.
Publication Date:
OSTI Identifier:
1253644
Report Number(s):
FERMILAB-PUB-15-591-CMS; CMS-SUS-14-021; CERN-PH-EP-2015-307; arXiv:1512.08002
Journal ID: ISSN 0370-2693; 1411443
Grant/Contract Number:
AC02-07CH11359
Type:
Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 759; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
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) (SC-25)
Contributing Orgs:
CMS Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CMS; physics; supersymmetry