Search for lepton-flavour-violating $H\to\mu\tau$ decays of the Higgs boson with the ATLAS detector

Abstract : A direct search for lepton-flavour-violating (LFV) $H\to\mu\tau$ decays of the recently discovered Higgs boson with the ATLAS detector at the LHC is presented. The analysis is performed in the $H\to\mu\tau_{\mathrm{had}}$ channel, where $\tau_{\mathrm{had}}$ is a hadronically decaying $\tau$-lepton. The search is based on the data sample of proton--proton collisions collected by the ATLAS experiment corresponding to an integrated luminosity of 20.3 fb$^{-1}$ at a centre-of-mass energy of $\sqrt{s}=8$ TeV. No statistically significant excess of data over the predicted background is observed. The observed (expected) 95% confidence-level upper limit on the branching fraction, Br($H\to\mu\tau$), is 1.85% (1.24%).
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Submitted on : Thursday, August 20, 2015 - 3:16:24 PM
Last modification on : Tuesday, November 5, 2019 - 4:32:43 PM

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G. Aad, Z. Barnovska, N. Berger, M. Delmastro, L. Di Ciaccio, et al.. Search for lepton-flavour-violating $H\to\mu\tau$ decays of the Higgs boson with the ATLAS detector. Journal of High Energy Physics, Springer Verlag (Germany), 2015, 11, pp.211. ⟨10.1007/JHEP11(2015)211⟩. ⟨in2p3-01185529⟩

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