Search for top quark flavor changing neutral currents in same-sign top quark production

Reza Goldouzian
Phys. Rev. D 91, 014022 – Published 21 January 2015

Abstract

The presence of the anomalous top-quark flavor-changing neutral-current (FCNC) interactions leads to the production of same-sign top quarks in proton-proton collisions. The results of a search for events with same-sign dileptons and b jets conducted by the CMS Collaboration with 10.5fb1 of data collected in pp collisions at s=8TeV are used to obtain the constraints on the strength of top-quark FCNC interactions. The 95% confidence level upper limits on the branching ratios of top-quark decays to a light quark q=u,c and a gauge or a Higgs boson are set to be BR(tuγ)<1.27%, BR(tuZ)<0.8%, BR(tug)<1.02%, and BR(tuH)<4.21%. The sensitivity of future searches in the same-sign top-quark channel is also presented.

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  • Received 23 November 2014

DOI:https://doi.org/10.1103/PhysRevD.91.014022

© 2015 American Physical Society

Authors & Affiliations

Reza Goldouzian*

  • School of Particles and Accelerators, Institute for Research in Fundamental Sciences (IPM), P.O. Box 19395-5531, Tehran, Iran

  • *r.goldouzian@ipm.ir

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Vol. 91, Iss. 1 — 1 January 2015

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