Abstract
In this proceeding, a search for a Higgs boson in the H to τ+τ− decay mode, where both taus decay hadronically or one decay hadronically and one leptonically. The analysis is based on a data sample of proton-proton collision collected by the ATLAS detector at the Large Hadron Collider (LHC) at centre-of-mass energies of 7 TeV during 2011, corresponding to an integrated luminosity of 4.7fb−1. No significant excess is observed in the Higgs boson mass range of 100–150 GeV. The observed (expected) limits on the cross-section times branching ratio for H to τ+τ− at mH=125 GeV are 6.2(5.9) and 6.3(6.5) for lepton-hadron and hadron-hadron decay modes, respectively.
Highlights
The Higgs boson is a fundamental particle in the Standard Model (SM) of particle physics predicted by the Higgs mechanism, which is related to the mass generation mechanism
If the Higgs boson is independently discovered in this channel, the measurement of the H→ τ+τ− decay rate provides a test of the SM prediction for the τ Yukawa coupling
Signal events are characterized by two identified τhad candidates with pT > 35 GeV and pT > 25 GeV selected with opposite charge
Summary
The Higgs boson is a fundamental particle in the Standard Model (SM) of particle physics predicted by the Higgs mechanism, which is related to the mass generation mechanism. The H→ τ+τ− decay mode is one of the most relevant search channels in the SM Higgs low-mass region. If the Higgs boson is independently discovered in this channel, the measurement of the H→ τ+τ− decay rate provides a test of the SM prediction for the τ Yukawa coupling. In this proceeding, a search for the SM Higgs boson in H → τlepτhad and H → τhadτhad decay modes is reported, where τlep and τhad denote leptonically and hadronically decaying τ lepton, respectively
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