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

TL;DR

This paper reports a search for lepton-flavour-violating Higgs decays to muon and tau leptons using ATLAS data, setting upper limits on the branching fraction with no significant signal observed.

Contribution

First direct search for $H\to\mu\tau$ decays in the ATLAS experiment, establishing upper limits on the branching ratio at 8 TeV collision energy.

Findings

No significant excess observed over background.

95% CL upper limit on Br($H\to\mu\tau$) is 1.85%.

Expected limit on Br($H\to\mu\tau$) is 1.24%.

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%).