Speaker
Lorenzo Bellagamba
(Universita e INFN (IT))
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
or LO multi-leg matrix elements. The data are able to constrain the uncertainty on the modelling
of the top pair production mechanism. We also discuss top production in association with photons and Z bosons.
In addition, we the discuss production of top quark pairs in association with heavy quarks (beauty and charm).
Primary author
Toni Baroncelli
(Roma Tre Universita Degli Studi (IT))
