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T: Fachverband Teilchenphysik

T 41: B-Quarks

T 41.7: Vortrag

Mittwoch, 17. März 2010, 15:30–15:45, HG ÜR 7

Optimization of the track selection for the ATLAS b-tagging algorithms — Markus Cristinziani, Gia Khoriauli, Marc Lehmacher, Agnieszka Leyko, Gizo Nanava, Tatevik Poghosyan, Nina Scislak, Duc Bao Ta, and •Nikolai Vlasov — Physikalisches Institut, Universität Bonn

The b-tagging performance strongly depends upon the tracking efficiency and on the jet momentum and rapidity. At high p_T the b-jet tagging performance degrades, regardless which tagging algorithm is used. At low p_T, where the performance is degraded mostly due to increased multiple scattering, maintaining a reasonable b-jet tagging efficiency is possible at the price of a very low rejection of light jets. The p_T dependence makes the extraction of the b-jet efficiency from data complicated. This analysis aims at improving the b-tagging performance for both low and high p_T ranges by optimizing of the track selection, for instance, extending the p_T range of the selected tracks or reducing the track multiplicities for high p_T jets.