Title
Search for flavor-changing neutral currents in top-quark decays <tex>$t\rightarrow Zq$</tex> in <tex>$pp$</tex> collisions at <tex>$\sqrt{s}$</tex> = 8 TeV Search for flavor-changing neutral currents in top-quark decays <tex>$t\rightarrow Zq$</tex> in <tex>$pp$</tex> collisions at <tex>$\sqrt{s}$</tex> = 8 TeV
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
New York, N.Y. ,
Subject
Physics
Source (journal)
Physical review letters. - New York, N.Y.
Volume/pages
112(2014) :17 , 16 p.
ISSN
0031-9007
Article Reference
171802
Carrier
E-only publicatie
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
A search for flavor-changing neutral currents in top-quark decays t -> Zq is performed in events produced from the decay chain (tt) over bar -> 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.
Full text (open access)
https://repository.uantwerpen.be/docman/irua/37b242/7684.pdf
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