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Berlin 2005 – scientific programme

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T: Teilchenphysik

T 705: Schwere Quarks VII

T 705.3: Talk

Wednesday, March 9, 2005, 14:30–14:45, TU H2033

New methods for b-jet selection at CDF — •Claudia Lecci1, Michael Feindt1, Gary Barker2, Stephanie Menzemer3, Ulrich Kerzel1, and Kurt Rinnert11Institut für Experimentelle Kernphysik, Wolfgang-Gaede-Str.1, 76128 Karlsruhe — 2University of Warwick, Coventry, CV4 7AL, UK — 3MIT, 77, Massachusetts Avenue,Boston, 2039 MA, USA

One of the key tasks of heavy flavour physics analyses at CDF is the identification of b-mesons, their decay products and their flavour in a busy hadronic environment. New Next to Leading Order Monte Carlo events show that this task is more complex than usually thought. The reason is that higher order processes with a large cross section lead to a substantial weakening of the correlation between the b quarks in the same event.
Several jet related observables can help in discriminating b-jets from the background. In particular variables based on the probability of the single jet particles to be b decay products play an important role. The combination of these variables with neural newtork techniques improves b jet identification efficiency and purity. This talk will show how the use of a neural network can help to correctly identify b jets and demonstrate the impact on b-flavour tagging.

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