CMS-PAS-TOP-13-017

CMS-PAS-TOP-13-017
Search for top quark decays via Higgs-boson-mediated flavor changing
CMS Collaboration
March 2015

Abstract: A search for top quark decays via Higgs-boson-mediated flavor changingneutral currents ${\rm pp \rightarrow t\bar{t} \rightarrow \rm Hc + Wb}$ in events containing a trilepton or same-sign dilepton is presented. The search is performed with a data sample with an integrated luminosity of 19.7 fb $^{-1}$ of pp collisions at $\sqrt{s} = 8 \rm TeV$ collected with the CMS detector at the CERN LHC. The observed number of events agrees with the SM prediction, and no evidence for top quark decays via Higgs-boson-mediated flavor changing neutral currents are found. The measured 95\% confidence level observed and expected upper limits on the $\rm t \to Hc$ branching fraction are 0.93\% and 0.89\% respectively. This corresponds to an observed upper limit on top-charm flavor violating Higgs Yukawa coupling of $\sqrt{\left\|\lambda_{tc}^{H}\right\|^{2} + \left\|\lambda_{ct}^{H}\right\|^{2}} < 0.18$ .
Links: CDS record (PDF) ; inSPIRE record ; Public twiki page ; CADI line (restricted) ; Figures are available from the CDS record. These preliminary results are superseded in this paper, JHEP 02 (2017) 079. The superseded preliminary plots can be found here.

Compact Muon Solenoid
LHC, CERN