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T: Fachverband Teilchenphysik

T 25: QCD 1

T 25.6: Vortrag

Montag, 27. Februar 2012, 18:10–18:25, ZHG 009

Cross section measurement of pp→µ⁺µ⁻+b+X with 2010 LHC data at the ATLAS experiment — •Peter Steinbach, Kobel Michael, Mader Wolfgang, and Prudent Xavier — Institut für Kern- und Teilchenphysik, TU Dresden, Deutschland

In perturbative QCD, the study of heavy flavor partons in initial and final states of high energetic proton-proton collisions is a challenging field in terms of experiment and theory. The theoretical description of heavy flavor parton density functions is demanding due to non-negligable charm and bottom pole masses at higher orders of α_s. On the experimental side, identifying or tagging jets originating from heavy flavor parton emission requires performant algorithms and a thorough understanding of detector performance. We present results on the event-based cross section measurement of pp→µ⁺µ⁻+b+X at m_µ⁺µ⁻ ≈ m_Z⁰ with 2010 LHC data collected by the ATLAS experiment. An in-depth comparison with Next-to Leading Order as well as Leading Order plus Parton Shower predictions and state-of-the-art parton density distributions is made taking all related systematic uncertainties from experiment and theory into account.