22-29 July 2015
Europe/Vienna timezone

Measurements of the top quark properties in ttbar production at the LHC (includes charge asymmetry, top quark polarization, spin correlations and tt+V)

Jul 25, 2015, 9:36 AM
18m
HS31

HS31

talk Top and Electroweak Physics Top and Electroweak Physics

Speaker

Frank Sebastian Roscher (KIT - Karlsruhe Institute of Technology (DE))

Description

Measurements are presented of the properties of top quarks in pair production from proton-proton collisions at the LHC. The data were collected at pp centre-of-mass energies of 7 and 8 !TeV by the CMS experiment during the years 2011 and 2012. The charge asymmetry is measured using the difference of the absolute rapidities of the reconstructed top and anti-top kinematics, as well as from distributions of the top quark decay products. The measurements are performed in the decay channels of the ttbar pair into both one and two leptons in the final state. The results, obtained differentially in several kinematic variables of the ttbar-system, are discussed in the context of the forward-backard asymmetry measurements at Tevatron. The polarization of top quarks is measured from the decay angular distributions. Top quark spin correlations and asymmetries are measured from the angular distributions of the top quark decay products. Measurements of the associate production of top quark pairs with vector bosons (photons, W and Z) are also presented. The results are compared with standard model predictions.

Primary author

Arnd Meyer (Rheinisch-Westfaelische Tech. Hoch. (DE))

Presentation materials