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Search for a vectorlike quark with charge 2/3 in t+Z events from pp collisions at √s=7  TeV


CMS Collaboration; Chatrchyan, S; Amsler, C; Chiochia, V; Favaro, C; Verzetti, M; Snoek, H; De Visscher, S; Aguiló, E; Millan, B; Otyugova, P; Ivova, M; Storey, J; Schmitt, A (2011). Search for a vectorlike quark with charge 2/3 in t+Z events from pp collisions at √s=7 TeV. Physical Review Letters, 107(27):271802.

Abstract

A search for pair-produced heavy vectorlike charge-2/3 quarks, T, in pp collisions at a center-of-mass energy of 7 TeV, is performed with the CMS detector at the LHC. Events consistent with the flavor-changing-neutral-current decay of a T quark to a top quark and a Z boson are selected by requiring two leptons from the Z-boson decay, as well as an additional isolated charged lepton. In a data sample corresponding to an integrated luminosity of 1.14  fb-1, the number of observed events is found to be consistent with the standard model background prediction. Assuming a branching fraction of 100% for the decay T→tZ, a T quark with a mass less than 475  GeV/c2 is excluded at the 95% confidence level. Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. © 2011 CERN, for the CMS Collaboration

A search for pair-produced heavy vectorlike charge-2/3 quarks, T, in pp collisions at a center-of-mass energy of 7 TeV, is performed with the CMS detector at the LHC. Events consistent with the flavor-changing-neutral-current decay of a T quark to a top quark and a Z boson are selected by requiring two leptons from the Z-boson decay, as well as an additional isolated charged lepton. In a data sample corresponding to an integrated luminosity of 1.14  fb-1, the number of observed events is found to be consistent with the standard model background prediction. Assuming a branching fraction of 100% for the decay T→tZ, a T quark with a mass less than 475  GeV/c2 is excluded at the 95% confidence level. Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. © 2011 CERN, for the CMS Collaboration

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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:2011
Deposited On:13 Feb 2012 20:57
Last Modified:05 Apr 2016 15:36
Publisher:American Physical Society
ISSN:0031-9007 (P) 1079-7114 (E)
Publisher DOI:10.1103/PhysRevLett.107.271802
Related URLs:http://arxiv.org/abs/1109.4985
Permanent URL: http://doi.org/10.5167/uzh-58813

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