Mainz 2014 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 59: QCD (Theorie) 2
T 59.1: Vortrag
Dienstag, 25. März 2014, 16:45–17:00, P15
P wave contribution to third-order top-quark pair production near threshold — Martin Beneke1, Jan Piclum1,2, and •Thomas Rauh1 — 1TU München - Physik Department, Garching, Germany — 2RWTH Aachen University - Institut für Theoretische Teilchenphysik und Kosmologie, Aachen, Germany
The precise measurement of the top-quark pair production cross section is one of the main objectives at a future linear collider. By comparison to the theoretical prediction it allows to determine the mass and width of the top quark to very high precision. Near the production threshold the top-quark velocity v is of the same order as the strong coupling αs and hence Coulomb singularities (αs/v)n have to be resummed to all orders, which can be achieved by means of potential NRQCD. We discuss the computation of the NLO P wave Green function which constitutes one part of the complete third-order (NNNLO) result for top-pair production and present a phenomenological analysis of the P wave contribution to top-quark pair production in e+e− and γγ collisions.