Search for top-squark pairs decaying into Higgs or Z bosons in pp collisions at
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.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, 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:
- 1197711
- Alternate ID(s):
- OSTI ID: 1234832
- Report Number(s):
- FERMILAB-PUB-14-157-CMS; CERN-PH-EP-2014-073; CMS-SUS-13-024; S0370269314005553; PII: S0370269314005553
- Journal Information:
- Physics Letters B, Journal Name: Physics Letters B Vol. 736 Journal Issue: C; ISSN 0370-2693
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- Netherlands
- Language:
- English
Web of Science
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