Performance of b-jet identification in the ATLAS experiment during the LHC Run 2
by
Matthias Saimpert(DESY)
→
Europe/Berlin
Seminar Room 03 (DESY Hamburg)
Seminar Room 03
DESY Hamburg
Description
A variety of algorithms have been developed to identify jets originating from b-quark hadronization within the ATLAS experiment at the Large Hadron Collider. The identification of such jets is an essential ingredient to several LHC Run 2 (2015-2018) key measurements.
First, we will introduce briefly the various algorithms, ranging from those based on the reconstruction of one or several secondary vertices or the presence of tracks with large impact parameters to combined tagging algorithms making use of multi-variate discriminants.
We will then focus on the measurements in data of the b-jet tagging efficiency, the c-jet tagging efficiency and the mistag rate for light flavour jets. Several complementary methods are used and allow to provide scale factors, defined as the ratio of the efficiency (or mistag rate) in data to that in simulation, to the ATLAS collaboration, improving the precision of physics measurements relying on b or c-jet identification.
