Mainz 2014 – scientific programme

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T: Fachverband Teilchenphysik

T 113: Elektroschwache Physik (Theorie) 2

T 113.8: Talk

Thursday, March 27, 2014, 18:30–18:45, P103

NLO corrections to top-quark decay including W-boson off-shell effects — Lorenzo Basso^1,2, Stefan Dittmaier¹, and •Luisa Oggero¹ — ¹Albert-Ludwigs-Universität Freiburg — ²IPHC Strasbourg

We study the NLO electroweak and QCD corrections to the top-quark decay width, including the W-boson decay and off-shell effects. Both the semileptonic, t→ b ν_e e⁺, and the hadronic, t→ b u d, decays are considered.

To deal with soft and collinear divergences, we extended the one-cutoff slicing method, to properly account for the massive case. In order to check the validity of the method employed, we compare our calculation of the QCD corrections to the known results given in the literature. Furthermore we discuss the new results for the electroweak corrections and compare the full off-shell calculation against the one obtained using the narrow-width approximation.