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Title: Search for top-squark pairs decaying into Higgs or Z bosons in pp collisions at √s=8 TeV

Our search for supersymmetry through the direct pair production of top squarks, with Higgs (H) or Z bosons in the decay chain, is performed using a data sample of proton–proton collisions at √s= 8TeV collected in 2012 with the CMS detector at the LHC. The sample corresponds to an integrated luminosity of 19.5 fb-1. The search is performed using a selection of events containing leptons and bottom-quark jets. No evidence for a significant excess of events over the standard model background prediction is observed. The results are interpreted in the context of simplified supersymmetric models with pair production of a heavier top-squark mass eigenstate t~2 source decaying to a lighter top-squark mass eigenstate t~2 via either t~2 → Ht~1 or t~2 →Zt~1, followed in both cases by t~1→ tχ~01, where χ~01 source is an undetected, stable, lightest supersymmetric particle. The interpretation is performed in the region where the mass difference between the t~1 and χ~01 states is approximately equal to the top-quark mass (mt1-mχ01≃mt), which is not probed by searches for direct t~1 squark pair production. This analysis excludes top squarks with mass mt1 <575 GeVand mt2 <400 GeV source at a 95% confidence level.
Authors:
 [1]
  1. Yerevan Physics Inst. (YerPhI) (Armenia). et al.
Publication Date:
Report Number(s):
FERMILAB-PUB-14-157-CMS; CERN-PH-EP-2014-073; CMS-SUS-13-024
Journal ID: ISSN 0370-2693; arXiv eprint number arXiv:1405.3886; TRN: US1601114
Grant/Contract Number:
AC02-07CH11359
Type:
Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 736; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Research Org:
Fermi National Accelerator Lab. (FNAL), Batavia, 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; SUSY; Stop; Higgs
OSTI Identifier:
1197711
Alternate Identifier(s):
OSTI ID: 1234832