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

Aad, G. and Abbott, B. and Abdallah, J. and Abdel, Khalek S. and Abdinov, O. and Krasznahorkay, Attila and Nagai, Yoshikazu and Pásztor, Gabriella and Tóth, József (2015) Evidence for the Higgs-boson Yukawa coupling to tau leptons with the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS (4). ISSN 1126-6708

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Abstract

Results of a search for H → τ τ 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 corre- spond to integrated luminosities of 4.5 fb−1 and 20.3 fb−1 at centre-of-mass energies of √s = 7 TeV and √s = 8 TeV respectively. All combinations of leptonic (τ → `ν ¯ν with ` = 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) stan- dard 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 +0.43 −0.37 is consistent with the predicted Yukawa coupling strength in the Standard Model.

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