Speaker
Dominik Duda
(Bergische Universitaet Wuppertal (DE))
Description
The large centre-of-mass energy available at the proton-proton collider LHC allows for the copious production of top quark pairs in association with other final state particles at high transverse momentum. The ATLAS experiment has measured several final state observables that are sensitive to additional parton radiation in top anti-top quark final states. Examples are the multiplicity of jets for various transverse momentum thresholds or the probability to emit jets above a given threshold in a fixed rapidity region. These measurements are compared to modern Monte Carlo generators based
on NLO QCD matrix element of LO multi-leg matrix elements and with systematic model parameter variations. The data are able to constrain the uncertainty on the modelling of the top pair production mechanism.
