Top quark pair property measurements using the ATLAS detector at the LHC

Apr 13, 2016, 10:00 AM
SR2 (DESY Hamburg)


DESY Hamburg

Heavy Flavours (Charm, Beauty and Top) WG4 Heavy Flavours


Mohammad Kareem (Georg-August-Universitaet Goettingen)


Precise measurements of the properties of the top quark test the Standard Model (SM) and can be used to constrain new physics models. The top quark pair charge asymmetry is an asymmetry predicted to occur beyond leading­order QCD in the SM, and may be significantly enhanced by the presence of new physics. The ttbar production charge asymmetry is measured inclusively and differentially using the 8 TeV ATLAS dataset using both the lepton+jets and dilepton channels, including a dedicated measurement for highly boosted top­quarks. The results are in agreement with the SM and are compared to new physics models. The top­quark is predicted in the SM to decay almost exclusively into a W boson and a b­quark. We present a wide range of searches for non­SM top quark decays using the 8 TeV ATLAS dataset, including t->q H, t->q gamma and t->q Z. In addition, measurements of the W­helicity and spin correlations in ttbar production are presented.

Primary author

Dr Elizaveta Shabalina (University of Gottingen)

Presentation materials