Aug 5 – 10, 2019
Westin Harbour Castle, Toronto Canada
America/Toronto timezone

Direct top-quark decay width measurement at √s=13 TeV with the ATLAS experiment

Aug 6, 2019, 4:30 PM
Parallel Session talk Collider SM & BSM (Parallel)


Tomas Dado (Comenius University (SK))


Precise measurements of the properties of the top quark test the Standard Model (SM) and can be used to constrain new physics models. ATLAS collaboration performed a direct measurement of the decay width of the top quark using ttbar events in the lepton+jets and dilepton final states. The data sample was collected by the ATLAS detector at the LHC in proton-proton collisions at a centre-of-mass energy of 13 TeV and corresponds to an integrated luminosity of 140 fb−1. A multivariate technique is employed in the lepton+jets channel to resolve the ambiguity of the jet-to-parton assignment. The decay width of the top quark is extracted from the data using a profile likelihood method using the distributions of variables sensitive to the top-quark decay width in tt ̄ pair production.

Primary authors

ATLAS Collaboration Tomas Dado (Comenius University (SK))

Presentation materials