Search for lepton-flavour-violating decays of the Higgs boson
CMS Collaboration (ukupan broj autora: 2148)
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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 - GT mu tau(e) and H - GT mu tau(h) channels, where tau(e) and tau(h) 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 root s = 8 TeV 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 M-H = 125 GeV is 0.010. The best fit branching fraction is beta(H - GT mu tau) = (0.84(-0.37)(+0.39))%. A constraint on the branching fraction, beta(H - GT mu tau) LT 1.51% at 95% confidence level is set. This limit is subsequently used to constrain the mu-...tau Yukawa couplings to be less than 3.6 x 10(-3). (C) 2015 CERN for the benefit of the CMS Collaboration. Published by Elsevier B.V.
Keywords:CMS / Physics / Higgs / Muons / Taus / Lepton-flavour-violation
Source:Physics Letters B, 2015, 749, 337-362
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