CMS
PRELIMINARY
SM
Search for Lepton Flavour Violating Decays of the Higgs Boson
The first direct search for Lepton Flavor Violating Decays of the recently discovered Higgs boson using fb of TeV data taken in 2012 using the and channels is described , where and are taus reconstructed in the hadronic and electronic decay channels respectively. 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 2.5 is observed. The local p-value of this excess at M_{H}=126~\mathrm{GeV} is 0.007. Interpreted as a limit this results in a constraint of at 95\% confidence level. The best fit branching fraction is . The limit is subsequently used to constrain the Yukawa coupling.