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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 Rinnert1 — 1Institut 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.