Jul 4 – 11, 2012
Melbourne Convention and Exhibition Centre
Australia/Melbourne timezone
ICHEP2012 - 36th International Conference for High Energy Physics

Measuring the b-jet tagging efficiency using top quark pairs events with ATLAS data

Jul 7, 2012, 6:00 PM
Melbourne Convention and Exhibition Centre

Melbourne Convention and Exhibition Centre

Melbourne Australia
Board: 61
Poster Sessions Track 13. Detectors and Computing for HEP Poster Session


Ms Agnieszka Leyko (Universitaet Bonn (DE))


Many physics analyses with the ATLAS detector expect to have jets originating from b-quarks in the final state. Algorithms that allow to identify such jets are thus of great importance and it is crucial to study their performance directly in data by measuring the tagging efficiencies and fake rates. Since the top quark almost exclusively decays to a W boson and a b-quark, a sample of top quark pairs events is ideal for studying the b-tagging performance. Final states containing one or two leptons have been used to measure the b-tagging efficiency, either by counting the number of b-tagged jets, by exploiting the kinematics of top quark pairs decays and flavor composition of studied sample or by applying kinematical fit to extract sample rich in b-jets.

Primary author

Ms Agnieszka Leyko (Universitaet Bonn (DE))

Presentation materials