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Collider Cross Talk
NLO corrections to top quark pair production and decay, and the top quark forward--backward aymmetry in parton showers
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Europe/Zurich
4/3-006 - TH Conference Room (CERN)
Description
NLO part by Keith Ellis
The implementation of top production and decay processes in the parton-level Monte Carlo program MCFM is described. By treating the top quark as being on-shell, one can factorize the amplitudes for top-pair production, s-channel single-top production, and t-channel single-top production into the product of an amplitude for production and an amplitude for decay. In this way one can retain all spin correlations. Both the production and the decay amplitudes are calculated consistently at next-to-leading order in alphas. The full dependence on the b-quark mass is also kept. Phenomenological results are presented for various kinematic distributions at the LHC and for the top quark forward--backward asymmetry at the Tevatron.
Event generator by Jan Winter
Parton showers incorporating soft colour coherence can generate a forward--backward asymmetry in top quark pair production. The origin of this feature is discussed and results of a comparison between different Monte Carlo event generators are shown.
The implementation of top production and decay processes in the parton-level Monte Carlo program MCFM is described. By treating the top quark as being on-shell, one can factorize the amplitudes for top-pair production, s-channel single-top production, and t-channel single-top production into the product of an amplitude for production and an amplitude for decay. In this way one can retain all spin correlations. Both the production and the decay amplitudes are calculated consistently at next-to-leading order in alphas. The full dependence on the b-quark mass is also kept. Phenomenological results are presented for various kinematic distributions at the LHC and for the top quark forward--backward asymmetry at the Tevatron.
Event generator by Jan Winter
Parton showers incorporating soft colour coherence can generate a forward--backward asymmetry in top quark pair production. The origin of this feature is discussed and results of a comparison between different Monte Carlo event generators are shown.