Search for the Standard Model Higgs boson in H → τ⁺ τ⁻ decays in proton-proton collisions with the ATLAS detector

E-ISSN： 2100-014x|71|issue|00145-00145

ISSN： 2100-014x

Source： EPJ Web of Conference, Vol.71, Iss.issue, 2014-04, pp. : 00145-00145

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Abstract

A search for the Standard Model (SM) Higgs boson decaying into a pair of τ leptons is reported. The analysis, exploiting each of the lepton-lepton, lepton-hadron and hadron-hadron di-tau final states, is based on data samples of proton-proton (pp) collisions collected by the ATLAS experiment at the Large Hadron Collider (LHC) and corresponding to integrated luminosities of 4.6 fb⁻¹ and 13:0 fb⁻¹ at center-of-mass energies of √s = 7 TeV and 8 TeV, respectively. The observed (expected) upper limit at 95%CL on the cross-section times the branching ratio for SM H → τ⁺τ⁻ Cis found to be 1.9(1.2) times the SM prediction for a Higgs boson with mass m_H = 125 GeV. For this mass, the observed (expected) deviation from the background-only hypothesis corresponds to a local significance of 1.1 (1.7) standard deviations.