4-9 June 2012
Life Sciences Centre, UBC
Canada/Pacific timezone
<strong><font color="#cc0000">Abstract submission has closed</font></strong>

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

4 Jun 2012, 16:00
West Atrium (Life Sciences Centre, UBC)

West Atrium

Life Sciences Centre, UBC

University of British Columbia Vancouver, BC Canada
Poster Standard Model & Beyond 1D: Poster Session and Coffee Break


Dominik Duda (Fachbereich C / Physik)


Many physics analyses with the ATLAS detector expect to have jet 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 understand their performance with data-driven measurements of efficiencies and fake rates. Since the top quark almost exclusively decays to a W boson and a b-quark, a sample of top anti-top 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 or by applying kinematical fit methods to extract a pure sample of b-jets. The calibration methods based on top anti-top events are especially important because they can provide measurements of the b-tagging efficiency also for jets with high momentum.

<strong>Collaboration Name</strong><br /><font color="#000099">Please enter the name of<br />the collaboration or group<br />using the acronym, as in:<br /><font color="#ff0000">ABC Collaboration</font>

ATLAS Collaboration

<strong>E-mail Address</strong> dominik.duda@cern.ch

Primary author

Dominik Duda (Fachbereich C / Physik)

Presentation Materials