CERN Accelerating science

ATLAS Note
Report number	ATLAS-CONF-2013-108
Title	Evidence for Higgs Boson Decays to the $\tau^+\tau^-$ Final State with the ATLAS Detector
Corporate Author(s)	The ATLAS collaboration
Publication	2013
Imprint	28 Nov 2013
Number of pages	mult.
Note	All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2013-108
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	ATLAS ; Higgs ; tau ; Standard Model
Abstract	A search for the Higgs boson with a mass of about $125$ GeV decaying into a pair of $\tau$ leptons is performed with a data sample of proton-proton collisions, corresponding to an integrated luminosity of $\mathcal{L}=20.3$ fb$^{-1}$, collected with the ATLAS detector at the LHC at a centre-of-mass energy of $\sqrt{s}=8$ TeV. Final states in all $\tau$ decay combinations (both hadronic and leptonic) are examined. The observed (expected) deviation from the background-only hypothesis corresponds to a significance of 4.1 (3.2) standard deviations, and the measured signal strength is $\mu = 1.4 ^{+0.5}_{-0.4}$. This is evidence for the existence of $H\rightarrow\tau^+\tau^-$ decays, consistent with the Standard Model expectation for a Higgs boson with $m_H=125$ GeV.
Copyright/License	Preprint: (License: CC-BY-4.0)

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