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

Allison, Lee and Barton, Adam and Beattie, Michael and Borissov, Guennadi and Bouhova-Thacker, Eva and Chilingarov, Alexandre and Dearnaley, William and Fox, Harald and Grimm, Kathryn and Henderson, Robert and Hughes, Gareth and Jones, Roger William Lewis and Kartvelishvili, Vakhtang and Long, Robin and Love, Peter and Maddocks, Harvey and Smizanska, Maria and Walder, James (2015) Evidence for the Higgs-boson Yukawa coupling to tau leptons with the ATLAS detector. Journal of High Energy Physics, 2015 (4). ISSN 1029-8479

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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.

Item Type:
Journal Article
Journal or Publication Title:
Journal of High Energy Physics
Additional Information:
Open Access, Copyright CERN, for the benefit of the ATLAS Collaboration. Article funded by SCOAP3
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3106
Subjects:
ID Code:
74068
Deposited By:
Deposited On:
18 Jun 2015 06:01
Refereed?:
Yes
Published?:
Published
Last Modified:
27 Sep 2020 02:31