Search for top quark decays via Higgs-boson-mediated flavor changing neutral currents in pp collisions at~$\sqrt{s}$~=~8~TeV

A search for top quark decays via Higgs-boson-mediated flavor changing neutral 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$^{-...

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Autor principal: CMS Collaboration
Publicado: 2015
Materias:
Acceso en línea:http://cds.cern.ch/record/2001934
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author CMS Collaboration
author_facet CMS Collaboration
author_sort CMS Collaboration
collection CERN
description A search for top quark decays via Higgs-boson-mediated flavor changing neutral 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 $\sqrt{\left|\lambda_{tc}^{H}\right|^{2} + \left|\lambda_{ct}^{H}\right|^{2}} < 0.18$.
id cern-2001934
institution Organización Europea para la Investigación Nuclear
publishDate 2015
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spelling cern-20019342019-09-30T06:29:59Zhttp://cds.cern.ch/record/2001934CMS Collaboration Search for top quark decays via Higgs-boson-mediated flavor changing neutral currents in pp collisions at~$\sqrt{s}$~=~8~TeVParticle Physics - ExperimentA search for top quark decays via Higgs-boson-mediated flavor changing neutral 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 $\sqrt{\left|\lambda_{tc}^{H}\right|^{2} + \left|\lambda_{ct}^{H}\right|^{2}} < 0.18$.CMS-PAS-TOP-13-017oai:cds.cern.ch:20019342015
spellingShingle Particle Physics - Experiment
CMS Collaboration
Search for top quark decays via Higgs-boson-mediated flavor changing neutral currents in pp collisions at~$\sqrt{s}$~=~8~TeV
title Search for top quark decays via Higgs-boson-mediated flavor changing neutral currents in pp collisions at~$\sqrt{s}$~=~8~TeV
title_full Search for top quark decays via Higgs-boson-mediated flavor changing neutral currents in pp collisions at~$\sqrt{s}$~=~8~TeV
title_fullStr Search for top quark decays via Higgs-boson-mediated flavor changing neutral currents in pp collisions at~$\sqrt{s}$~=~8~TeV
title_full_unstemmed Search for top quark decays via Higgs-boson-mediated flavor changing neutral currents in pp collisions at~$\sqrt{s}$~=~8~TeV
title_short Search for top quark decays via Higgs-boson-mediated flavor changing neutral currents in pp collisions at~$\sqrt{s}$~=~8~TeV
title_sort search for top quark decays via higgs-boson-mediated flavor changing neutral currents in pp collisions at~$\sqrt{s}$~=~8~tev
topic Particle Physics - Experiment
url http://cds.cern.ch/record/2001934
work_keys_str_mv AT cmscollaboration searchfortopquarkdecaysviahiggsbosonmediatedflavorchangingneutralcurrentsinppcollisionsatsqrts8tev