Precision measurements of top quark properties


The LHC is effectively a top quark factory, providing a high statistics of top quarks produced mainly in pairs, offering a unique opportunity to precisely measure spectra of individual top quarks as well as of the top-antitop system, enabling precision tests of quantum chromodynamics of a heavy quark at high energies, in both cases of the boosted (high transverse momentum) as well as resolved (angularily separated decay products) final states.
Even in high statistics regime, it is unclear why fully corrected data disagree with theory, be it due to missing electroweak corrections or non-perturbative effects modelling, while the community is waiting for fully differential predictions at the NNLO (next-to-next-to leading order) level.
Boosted top quarks offer the opportunity to probe physics of the heavy quark at yet unprobed energies and search for new physics while the pseudotop concept enables precision comparison of data to a variety of models of the hard process or the QCD radiation. Both approaches fully correct measured data for effects of the finite detector resolution and efficiency to the level of the visible phase space, avoiding modelling uncertainties related to corrections to the parton level (full phase space).
The aim of the study is to understand the production and decays of the top quark pairs and actively contribute and develop current analysis techniques in the boosted or resolved regime, and via the qualification task contribute to the signal modeling and detector response.

Mgr. Jiří Kvita, Ph.D.

SLO building, office 2.17, phone ++420 585 63 1585

doktorské studium