Würzburg 2018 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 58: Top-Quarks: Eigenschaften II
T 58.4: Gruppenbericht
Mittwoch, 21. März 2018, 17:15–17:35, Z6 - SR 1.002
Determination of the top-quark mass and the strong coupling constant using tt events with the CMS experiment at 13 TeV — Till Arndt1, •Matteo Defranchis1, Jan Kieseler2, Katerina Lipka1, and Andreas Meyer1 — 1DESY, Hamburg, Germany — 2CERN, Geneva, Switzerland
A determination of the top-quark mass and the strong coupling constant is performed using proton-proton collisions data recorded by the CMS detector during 2016 data taking at the centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 36/fb. A chi square fit to multiple differential distributions of final state observables is performed to constrain systematic uncertainties in situ and to extract the visible tt production cross section simultaneously with the top MC mass. The observed cross section is then compared to theory predictions at next-to-next-to-leading order in order to extract the top-quark mass in the MS and on-shell schemes and the strong coupling constant.