Mainz 2004 – scientific programme

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T: Teilchenphysik

T 504: Schwere Quarks V

T 504.2: Talk

Wednesday, March 31, 2004, 16:30–16:45, HS V

Identification of B decay products at CDF II — •Claudia Lecci¹, Gary Barker¹, Christian Dörr¹, Michael Feindt¹, Ulrich Kerzel¹, Philipp Mack¹, Stephanie Menzemer², Kurt Rinnert¹, and Alexander Skiba¹ — ¹Institut für Experimentelle Kernphysik, Wolfgang-Gaede-Str.1, 76131 Karlsruhe — ²MIT,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 environement. Observables traditionally used to identify b decay products are the impact parameter and the rapidity of the particles. Other observables related to single tracks (like particle ID, probability to fit a secondary vertex) and whole jets contain additional information. Their combination with neural network techniques helps to improve identification efficiency and purity.

Similar techniques can also be used to optimise b-flavour tagging, i.e. to determine whether a b-jet originates from a b quark or b antiquark.

This talk will show how the use of neural network can help to identify b decay products and demonstrate the impact on b-flavour tagging.