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

Author(s)
Taylor, Frank E
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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[superscript −1] and 20.3 fb[superscript −1] at centre-of-mass energies of √s=7 TeV and √s=8 TeV respectively. All combinations of leptonic (τ→ℓν[bar over ν] 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[superscript + 0.43] is consistent with the predicted Yukawa coupling strength in the Standard Model.
Date issued
2015-04
URI
http://hdl.handle.net/1721.1/114461
Department
Massachusetts Institute of Technology. Department of Physics
Journal
Journal of High Energy Physics
Publisher
Springer Berlin Heidelberg
Citation
The ATLAS collaboration, et al. “Evidence for the Higgs-Boson Yukawa Coupling to Tau Leptons with the ATLAS Detector.” Journal of High Energy Physics, vol. 2015, no. 4, Apr. 2015. © 2017 Springer International Publishing AG
Version: Final published version
ISSN
1029-8479
1126-6708

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