Bonn 2010 – wissenschaftliches Programm
T 14.2: Vortrag
Freitag, 19. März 2010, 14:15–14:30, HG XVI
Electroweak contributions to e+ e− → W+ W− b b in the t t resonance region — Martin Beneke, •Bernd Jantzen, and Pedro Ruiz-Femenía — Institut für Theoretische Physik E, RWTH Aachen University, 52056 Aachen
We analyse subleading electroweak effects in the top–antitop resonance production region in e+ e− collisions which arise due to the decay of top quarks into W b. These are NLO corrections adopting the non-relativistic power counting v ∼ αs ∼ √α. In contrast to the QCD corrections which have been calculated (almost) up to N3LO, the NLO electroweak contributions have not been fully known so far, but are mandatory for the required accuracy at a future linear collider. We also present results with cuts on the invariant masses of the W+ b and W− b pairs that enhance the top-quark signal.