Jun 24 – 25, 2019
Prague, Czech Republic
Europe/Prague timezone

Charge asymmetry in top-quark pair production at 13 TeV in proton-proton collisions with the ATLAS experiment

Jun 25, 2019, 9:25 AM
Lecture room 103 (Prague, Czech Republic)

Lecture room 103

Prague, Czech Republic

Czech Technical University in Prague Břehová 7, 115 19 Prague, Czech Republic


Matej Melo (Comenius University (SK))


We report a measurement of the charge asymmetry in top quark pair production using 139 fb^{-1} of proton-proton collision data collected at the centre-of-mass energy of 13 TeV by the ATLAS experiment.
Events are reconstructed in the so-called resolved topology and in a topology with highly boosted top quarks.
Both topologies are combined and a fully bayesian unfolding method is used to correct for limited detector acceptance and resolution.
The charge asymmetry is measured inclusively and differentially as a function of the top quark pair mass and longitudinal boost.
The measured values are in good agreement with the Standard Model NLO predictions and a non-zero inclusive asymmetry is observed at a 4 sigma confidence level.

Primary authors

Matej Melo (Comenius University (SK)) Oliver Majersky (Comenius University (SK)) Barbora Eckerova (Comenius University (SK)) Tomas Dado (Comenius University (SK)) Pavol Bartos (Comenius University (SK)) Stano Tokar (Comenius University (SK))

Presentation materials