Search for a SM Higgs boson in the H → Z*Z → ℓ+ℓ−qq̅ channel in the mass range 120 - 180 GeV with the ATLAS Detector at √s = 7 TeV
1 University of Naples "Federico II", Naples, Italy
2 INFN - Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Italy
A summary of the first study is given for the decay channel H → Z*Z → ℓ+ℓ−qq̅ (ℓ = e, μ) in the Higgs boson mass range 120 - 180 GeV, using the pp collision data collected by the ATLAS experiment at √s = 7 TeV at the LHC. Data driven methods to estimate the background and new techniques to improve the mass resolution of the hadronic Z boson decay are used. Events with 0 or 1 b-jets and events with 2 b-jets are treated as separated channels. No significant excess of events above the estimated background is observed; upper limits at 95% C.L. on the Higgs production cross section are derived.
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