Bonn 2010 – wissenschaftliches Programm

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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 algorithmsMarkus 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 pT the b-jet tagging performance degrades, regardless which tagging algorithm is used. At low pT, 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 pT 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 pT ranges by optimizing of the track selection, for instance, extending the pT range of the selected tracks or reducing the track multiplicities for high pT jets.

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