Search for Flavor-Changing Neutral Currents in Top-Quark Decays t→Zq in pp Collisions at √s=8 TeV
Search for Flavor-Changing Neutral Currents in Top-Quark Decays t→Zq in pp Collisions at √s=8 TeV
A search for flavor-changing neutral currents in top-quark decays t→Zq is performed in events produced from the decay chain t¯t→Zq+Wb, where both vector bosons decay leptonically, producing a final state with three leptons (electrons or muons). A data set collected with the CMS detector at the LHC is used, corresponding to an integrated luminosity of 19.7 fb−1 of proton-proton collisions at a center-of-mass energy of 8 TeV. No excess is seen in the observed number of events relative to the standard model prediction; thus, no evidence for flavor-changing neutral currents in top-quark decays is found. A combination with a previous search at 7 TeV excludes a t→Zq branching fraction greater than 0.05% at the 95% confidence level.
Chatrchyan, S.
23ce6af5-bdd2-435c-92c8-9b1b71a261ee
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3
2 May 2014
Chatrchyan, S.
23ce6af5-bdd2-435c-92c8-9b1b71a261ee
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3
Chatrchyan, S.
,
The CMS Collaboration
(2014)
Search for Flavor-Changing Neutral Currents in Top-Quark Decays t→Zq in pp Collisions at √s=8 TeV.
Physical Review Letters, 112 (17), [171802].
(doi:10.1103/PhysRevLett.112.171802).
Abstract
A search for flavor-changing neutral currents in top-quark decays t→Zq is performed in events produced from the decay chain t¯t→Zq+Wb, where both vector bosons decay leptonically, producing a final state with three leptons (electrons or muons). A data set collected with the CMS detector at the LHC is used, corresponding to an integrated luminosity of 19.7 fb−1 of proton-proton collisions at a center-of-mass energy of 8 TeV. No excess is seen in the observed number of events relative to the standard model prediction; thus, no evidence for flavor-changing neutral currents in top-quark decays is found. A combination with a previous search at 7 TeV excludes a t→Zq branching fraction greater than 0.05% at the 95% confidence level.
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Published date: 2 May 2014
Organisations:
Physics & Astronomy
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Local EPrints ID: 411074
URI: http://eprints.soton.ac.uk/id/eprint/411074
ISSN: 1079-7114
PURE UUID: bf7c71b6-532d-4c4c-8a37-9f49466ed95b
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Date deposited: 13 Jun 2017 16:33
Last modified: 16 Mar 2024 03:54
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Author:
S. Chatrchyan
Corporate Author: The CMS Collaboration
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