Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 65: Experimental methods III

T 65.4: Talk

Wednesday, March 17, 2021, 16:45–17:00, To

Derivation of Custom b-Tagging Working Points — Arnulf Quadt, Elizaveta Shabalina, and •Yusong Tian — II. Physikalisches Institut, Georg-August-Universität Göttingen

The identification of jet flavours plays an important role in experimental particle physics research. It aims at identifying jets initiated by b, c and light hadrons. b-tagging is the centre of flavour tagging, due to the distinct features of b-jets. In many analyses, selecting a suitable b-tagging working point for jet selection is often one of the first steps. Currently there are four working points centrally provided by the ATLAS flavour tagging group, corresponding to the efficiency of 60%, 70%, 77% and 85%. However, some analyses could benefit from having non-standard working points. The work to automate the flavour tagging workflow from ntuple production to calibration is ongoing, and providing flexible working point definitions is one link of the chain. This talk presents the framework that allows a user to derive custom working points, and defines different working point profiles (fixed cut, flat efficiency, hybrid and flat rejection).