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Search for top-quark partners with charge 5/3 in the same-sign dilepton final state


CMS Collaboration; Chatrchyan, S; Khachatryan, V; Sirunyan, A M; et al; Chiochia, V; Kilminster, B; Robmann, P (2014). Search for top-quark partners with charge 5/3 in the same-sign dilepton final state. Physical Review Letters, 112(171801):online.

Abstract

A search for the production of heavy partners of the top quark with charge $5/3$ is performed in events with a pair of same-sign leptons. The data sample corresponds to an integrated luminosity of $19.5\text{ }\text{ }{\mathrm{fb}}^{$-${}1}$ and was collected at $\sqrt{s}=8\text{ }\text{ }\mathrm{TeV}$ by the CMS experiment. No significant excess is observed in the data above the expected background, and the existence of top-quark partners with masses below 800 GeV is excluded at a 95% confidence level, assuming they decay exclusively to $tW$. This is the first limit on these particles from the LHC, and it is significantly more restrictive than previous limits.

Abstract

A search for the production of heavy partners of the top quark with charge $5/3$ is performed in events with a pair of same-sign leptons. The data sample corresponds to an integrated luminosity of $19.5\text{ }\text{ }{\mathrm{fb}}^{$-${}1}$ and was collected at $\sqrt{s}=8\text{ }\text{ }\mathrm{TeV}$ by the CMS experiment. No significant excess is observed in the data above the expected background, and the existence of top-quark partners with masses below 800 GeV is excluded at a 95% confidence level, assuming they decay exclusively to $tW$. This is the first limit on these particles from the LHC, and it is significantly more restrictive than previous limits.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2014
Deposited On:19 Feb 2014 08:35
Last Modified:08 Dec 2017 03:53
Publisher:American Physical Society
ISSN:0031-9007
Publisher DOI:https://doi.org/10.1103/PhysRevLett.112.171801

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