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  • art%3A10.1007%2FJHEP04%282015%29117

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Evidence for the Higgs-boson Yukawa coupling to tau leptons with the ATLAS detector

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Article number117
<mark>Journal publication date</mark>2015
<mark>Journal</mark>Journal of High Energy Physics
Issue number4
Volume2015
Number of pages74
Publication StatusPublished
<mark>Original language</mark>English

Abstract

Results of a search for H → ττ decays are presented, based on the full set of proton-proton collision data recorded by the ATLAS experiment at the LHC during 2011 and 2012. The data correspond to integrated luminosities of 4.5 fb−1 and 20.3 fb−1 at centre-of-mass energies of TeX TeV and TeX TeV respectively. All combinations of leptonic (TeX with ℓ = e, μ) and hadronic (τ → hadrons ν) tau decays are considered. An excess of events over the expected background from other Standard Model processes is found with an observed (expected) significance of 4.5 (3.4) standard deviations. This excess provides evidence for the direct coupling of the recently discovered Higgs boson to fermions. The measured signal strength, normalised to the Standard Model expectation, of μ = 1. 43 − 0.37 + 0.43 is consistent with the predicted Yukawa coupling strength in the Standard Model.

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Open Access, Copyright CERN, for the benefit of the ATLAS Collaboration. Article funded by SCOAP3