Dortmund 2021 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 56: Flavour physics III
T 56.7: Vortrag
Mittwoch, 17. März 2021, 17:30–17:45, Tf
The differential B-meson semi-leptonic width at NLO — Thomas Mannel, •Daniel Moreno, and Alexei A. Pivovarov — NN, Center for Particle Physics Siegen, Theoretische Physik 1, Universität Siegen
In this talk we present a new approach based on Heavy Quark Effective Theory (HQET) to compute the B-meson semi-leptonic decay width differential in the lepton pair energy. The key feature is the use of the spectral representation of the leptonic loop. The new setup allows for a systematic computation of corrections and the possibility to compute moments of the distribution with lepton energy cuts. We develop our method for the computation of αs corrections, which requires the computation of the imaginary part of two loop integrals with two masses.