Elsevier

Physics Letters B

Volume 736, 7 September 2014, Pages 371-397
Physics Letters B

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

https://doi.org/10.1016/j.physletb.2014.07.053Get rights and content
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Abstract

A 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=8 TeV 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 decaying to a lighter top-squark mass eigenstate t˜1 via either t˜2Ht˜1 or t˜2Zt˜1, followed in both cases by t˜1tχ˜10, where χ˜10 is an undetected, stable, lightest supersymmetric particle. The interpretation is performed in the region where the mass difference between the t˜1 and χ˜10 states is approximately equal to the top-quark mass (mt˜1mχ˜10mt), which is not probed by searches for direct t˜1 squark pair production. The analysis excludes top squarks with masses mt˜2<575 GeV and mt˜1<400 GeV at a 95% confidence level.

Keywords

CMS
SUSY
Stop
Higgs

Cited by (0)

1

Also at Vienna University of Technology, Vienna, Austria.

2

Also at CERN, European Organization for Nuclear Research, Geneva, Switzerland.

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