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

Abstract : Results of a search for $H \to \tau \tau$ 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 $\rm{fb}^{-1}$ and 20.3 $\rm{fb}^{-1}$ at centre-of-mass energies of $\sqrt{s}$ = 7 TeV and $\sqrt{s}$ = 8 TeV respectively. All combinations of leptonic ($\tau \to \ell \nu \bar \nu$ with $\ell = e, \mu$) and hadronic ($\tau \to \rm{hadrons}~ \nu$) 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 $\mu = 1.43 ^{+0.43}_{-0.37}$ is consistent with the predicted Yukawa coupling strength in the Standard Model.
Type de document :
Article dans une revue
Journal of High Energy Physics, Springer, 2015, 2015 (4), pp.117. 〈10.1007/JHEP04(2015)117〉

http://hal.in2p3.fr/in2p3-01107540
Contributeur : Emmanuelle Vernay <>
Soumis le : mercredi 21 janvier 2015 - 08:24:42
Dernière modification le : mardi 24 juillet 2018 - 15:46:14

### Citation

G. Aad, S. Albrand, J. Brown, J. Collot, S. Crépé-Renaudin, et al.. Evidence for the Higgs-boson Yukawa coupling to tau leptons with the ATLAS detector. Journal of High Energy Physics, Springer, 2015, 2015 (4), pp.117. 〈10.1007/JHEP04(2015)117〉. 〈in2p3-01107540〉

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