Search for lepton-flavour-violating decays of the Higgs boson
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Issue Date
2015-07-26Author
CMS Collaboration
Publisher
Elsevier
Type
Article
Article Version
Scholarly/refereed, publisher version
Published Version
http://www.sciencedirect.com/science/article/pii/S0370269315005638Rights
Open Access funded by SCOAP³ - Sponsoring Consortium for Open Access Publishing in Particle Physics
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Show full item recordAbstract
The first direct search for lepton-flavour-violating decays of the recently discovered Higgs boson (H) is described. The search is performed in the H→μτe and H→μτh channels, where τe and τh are tau leptons reconstructed in the electronic and hadronic decay channels, respectively. The data sample used in this search was collected in pp collisions at a centre-of-mass energy of View the MathML source with the CMS experiment at the CERN LHC and corresponds to an integrated luminosity of 19.7 fb−1. The sensitivity of the search is an order of magnitude better than the existing indirect limits. A slight excess of signal events with a significance of 2.4 standard deviations is observed. The p -value of this excess at MH=125 GeV is 0.010. The best fit branching fraction is View the MathML source. A constraint on the branching fraction, B(H→μτ)<1.51% at 95% confidence level is set. This limit is subsequently used to constrain the μ–τ Yukawa couplings to be less than 3.6×10−3.
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Citation
CMS Collaboration. "Search for lepton-flavour-violating decays of the Higgs boson." Physics Letters B v. 749 (2015): 337-362.
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