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

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

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...

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Bibliographic Details
Main Authors: Apyan, Aram, Barbieri, Richard Alexander, Busza, Wit, Cali, Ivan Amos, Chan, M., Di Matteo, Leonardo, Dutta, Valentina, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Gulhan, Doga Can, Klute, Markus, Lai, Yue Shi, Lee, Yen-Jie, Paus, Christoph M. E., Ralph, Duncan Kelley, Stephans, George S. F., Stoeckli, Fabian, Velicanu, Dragos Alexandru, Veverka, Jan, Wyslouch, Boleslaw, Zanetti, Marco, ATLAS Collaboration, Sumorok, Konstanty C, Yang, Mingming, Wyslouch, Victoria, Bauer, Gerry P, Luckey Jr, P David, Ma, Teng, Roland, Christof E, Roland, Gunther M
Other Authors: Massachusetts Institute of Technology. Department of Physics
Format: Article
Language:en_US
Published: Elsevier B.V. 2014
Online Access:http://hdl.handle.net/1721.1/91178
https://orcid.org/0000-0002-3831-9071
https://orcid.org/0000-0003-3106-4894
https://orcid.org/0000-0001-6332-5839
https://orcid.org/0000-0001-8983-2169
https://orcid.org/0000-0002-1260-777X
https://orcid.org/0000-0002-9418-6656
https://orcid.org/0000-0002-6047-4211
https://orcid.org/0000-0002-7945-005X
https://orcid.org/0000-0003-3681-0649
https://orcid.org/0000-0003-1486-606X
https://orcid.org/0000-0003-2593-7767
https://orcid.org/0000-0001-9236-6621
https://orcid.org/0000-0002-0869-5631
Description
Summary: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[superscript −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 ˜2→Ht˜1 or t˜2→Zt˜1, followed in both cases by t˜1→tχ˜10, where χ˜10 is an undetected, stable, lightest supersymmetric particle. The interpretation is performed in the region where the mass difference between thet˜1 and χ˜10 states is approximately equal to the top-quark mass (m[subscript t˜1]−mχ˜10≃mt), which is not probed by searches for direct t˜1 squark pair production. The analysis excludes top squarks with masses m[subscript t˜2]<575 GeV and m[subscript t˜1]<400 GeV at a 95% confidence level.

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