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T: Fachverband Teilchenphysik

T 31: Higgs: Zerfall in Fermionen 1

T 31.3: Talk

Monday, March 24, 2014, 17:20–17:35, P10

Search for the Standard Model Higgs boson in the dimuon decay channel with the ATLAS detector — •Christian Rudolph, Michael Kobel, and Wolfgang Mader — IKTP TU Dresden

In summer 2012 the ATLAS and CMS collaborations discovered a new particle with a mass of approximately 125 GeV via decays to photon, W and Z boson pairs with rates consistent with those of the Standard Model (SM) Higgs boson. The H→µ⁺µ⁻ is the only channel where couplings to second generation fermions could be measured at the LHC with a clean final-state signature allowing precise measurement of the Higgs boson mass. This talk presents and summarises the search for the SM Higgs boson in the dimuon decay channel, carried out analysing 20.7 fb⁻¹ of proton-proton collision data recorded by the ATLAS experiment at the LHC in 2012. No hint for a signal is observed, so exclusion limits at 95% CL on σ(pp→ H)×BR(H→µ⁺µ⁻) are set in the dimuon invariant mass range of 110 GeV < m_µµ < 150 GeV. The observed (expected) limits for a SM Higgs boson with a mass of 125 GeV are 9.8 (8.2) times the SM expectation.