Search for lepton–flavour–violating H → μτ decays of the Higgs boson with the ATLAS detector

Aad, G. and Abbott, B. and Abdallah, J. and Abdinov, O. and Aben, R. and Krasznahorkay, Attila and Nagai, Yoshikazu and Pásztor, Gabriella and Tóth, József (2015) Search for lepton–flavour–violating H → μτ decays of the Higgs boson with the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS (11). ISSN 1126-6708

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Abstract

A direct search for lepton–flavour–violating (LFV) H → μτ decays of the recently dis- covered Higgs boson with the ATLAS detector at the LHC is presented. The analysis is performed in the H → μτhad channel, where τhad is a hadronically decaying τ–lepton. The search is based on the data sample of proton–proton collisions collected by the ATLAS ex- periment corresponding to an integrated luminosity of 20.3 fb−1 at a centre–of–mass energy of √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 → μτ), is 1.85% (1.24%).

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