Heidelberg 2022 – scientific programme

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T: Fachverband Teilchenphysik

T 70: Experimental Methods (general) 3

T 70.1: Talk

Wednesday, March 23, 2022, 16:15–16:30, T-H29

Calibration of the b-tagging mis-tag rate for charm jets based on W+c events at √s = 13 TeV with the ATLAS experiment — Johannes Erdmann and •Benedikt Gocke — TU Dortmund University, Department of Physics

Identifying jets containing heavy-flavour hadrons is needed for many analyses in the ATLAS experiment. This is done using flavour tagging algorithms. Since these algorithms need to be calibrated, it is important to also calibrate the mis-tag rate for non-heavy flavour jets. These calibrations are done by matching their performance in simulation to data.
The mis-tag rate calibration for c-jets using W+c events is presented, which allows for a relatively pure sample of c-jets. For this process, a prompt muon and a muon inside a jet (soft muon) are expected in the final state. Therefore, the usage of an event selection which selects events in regions defined by the electric charge of the expected muon pair in the final state is shown. Furthermore, the construction of a signal region to reduce the background contributions, which is based on the expected opposite-sign-charged lepton pair for the signal process is illustrated. The calculation of the efficiencies for the used heavy flavour tagger is shown. Finally, the resulting data-to-simulation scale factors are discussed.