Abstract
Searches for Higgs bosons decaying to lepton pairs are summarised using the run 1 dataset recorded by the CMS detector. The first part of this summary is devoted to the search for Higgs bosons decaying to tau pairs. The search is carried out using all six tau-pair final states, with the tau decaying to a muon, an electron, or hadrons. Evidence for Higgs boson decays to taus is reported, and constraints on the couplings of the Higgs boson to fermions and bosons are derived. Then, searches for Higgs boson decays to muons and electrons are also discussed. The last part discusses a search for lepton-flavour violating Higgs boson decays to a muon and a tau, with the tau being reconstructed in the decay to an electron or hadrons. The analysis places the best limits on the respective Yukawa couplings to date while showing a slight excess of 2.5 standard deviations above the standard model expectation.
Highlights
At the time of the previous ICHEP conference in2012, the discovery of a particle was reported with mass near 125 GeV and properties consistent with those of the standard model (SM) Higgs boson
While searches for H → μμ and H → ee decays are not sensitive to the event rates predicted by the SM, they allow to test whether the Higgs boson couplings to leptons are proportional to its mass, as predicted by the SM, or whether the couplings are flavour-universal, i.e. the same as for taus
The analysis strategy is similar to the one in the search for SM Higgs boson decays to tau pairs in the corresponding μτh and μe final states
Summary
2012, the discovery of a particle was reported with mass near 125 GeV and properties consistent with those of the standard model (SM) Higgs boson. The first goal of the search for H → ττ decays is to answer this question, i.e. to test whether the Higgs boson decays to taus, leptons, and fermions [6]. While searches for H → μμ and H → ee decays are (at least currently) not sensitive to the event rates predicted by the SM, they allow to test whether the Higgs boson couplings to leptons are proportional to its mass, as predicted by the SM, or whether the couplings are flavour-universal, i.e. the same as for taus. The final-state leptons are required to have opposite charge, which is not explicitly noted. The search for LFV H → τμ decays is reported in section 4, after which an overall summary is given
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