Bonn 2020 – scientific programme
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T: Fachverband Teilchenphysik
T 42: Experimental methods II
T 42.3: Talk
Tuesday, March 31, 2020, 17:30–17:45, L-4.001
b-tagging efficiency calibration for Variable-R track jets — •Janik von Ahnen for the ATLAS collaboration — DESY, Hamburg, Germany
Many analyses rely on b-tagging algorithms to identify jets containing b-hadrons which are often a distinct feature of interesting processes at the LHC. The b-tagging algorithms are trained using simulation and are calibrated with data-to-simulation scale factors to account for differences coming from mismodeling in the simulation. The method of calculating the data-to-simulation scale factors for anti-kt Variable-R track jets and the data set collected by ATLAS at √s=13 TeV in the years 2015, 2016, 2017 and 2018 (Lint=140 fb−1) is presented. A sample enriched in di-leptonic tt and a likelihood-based fitting method are used to extract the b-tagging efficiency in data. In the fit, control regions constructed with variables, which are not related to b-tagging, are implemented to allow for the simultaneous fit of b-tagging efficiency and flavour composition.