CMS-PAS-SUS-13-024

CMS-PAS-SUS-13-024
Search for top-squark pair production with Higgs and Z bosons in the final state in pp collisions at 8 TeV
CMS Collaboration
2014

Abstract: A search for direct top-squark pair production with Higgs or Z bosons in the decay final state is performed using a data sample of proton-proton collisions at $\sqrt{s}=8$ ~TeV, collected by the CMS detector at the LHC that corresponds to an integrated luminosity of 19.5~fb $^{-1}$ . The search is performed in a sample of events containing leptons and b 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 models with pair production of a heavier top-squark mass eigenstate $\tilde{\mathrm{t}}_{2}$ decaying to a lighter top-squark mass eigenstate $\tilde{\mathrm{t}}_{1}$ via either $\tilde{\mathrm{t}}_{2}\rightarrow \mathrm{H} \tilde{\mathrm{t}}_{1}$ or $\tilde{\mathrm{t}}_{2}\rightarrow \mathrm{Z} \tilde{\mathrm{t}}_{1}$ , followed in both cases by $\tilde{\mathrm{t}}_{1}\rightarrow \mathrm{t}\tilde{\chi}_{1}^{0}$ . The interpretation is performed in the region of signal mass parameter space $m_{\tilde{\mathrm{t}}_{1}} - m_{\tilde{\chi}_{1}^{0}} \sim m_{\mathrm{t}}$ , which so far is not probed by existing searches for direct top-squark pair production. The analysis excludes top squarks with masses $m_{\tilde{\mathrm{t}}_{2}}<575$ ~GeV and $m_{\tilde{\mathrm{t}}_{1}}<400$ ~GeV at the 95\% confidence level.
Links: CDS record (PDF) ; inSPIRE record ; Public twiki page ; CADI line (restricted) ; These preliminary results are superseded in this paper, PLB 736 (2014) 371. The superseded preliminary plots can be found here.

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