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T: Fachverband Teilchenphysik

T 29: QCD II

T 29.1: Vortrag

Dienstag, 16. März 2010, 16:45–17:00, HG X

Suppression of beam-induced and cosmic background in the Atlas detector using jet clean-up cuts — •Florian Ahles, Bernhard Meirose, and Gregor Herten — Albert-Ludwigs Universität, Freiburg

We have studied the suppression of fake jets arising from beam-induced background and cosmic rays by using jet quality cuts. Beam halo, beam gas or cosmic ray jets have particular features that are distinguishable from QCD jets. Monte Carlo samples modelling QCD dijet, beam gas, beam halo and cosmic events as well as cosmic and single beam data from fall 2008 are used for this study. Several jet variables are tested for their discriminative power. The results are compared to existing studies and furthermore the selection is optimized using multivariate techniques.