Comparing different ansatzes to describe electroweak radiative corrections to exclusive semileptonic B meson decays into (pseudo)scalar final state mesons using Monte-Carlo techniques

Understand

In this publication electroweak next-to-leading order corrections to semileptonic B-meson decays into (pseudo)scalar final states are presented.

• To this end, these corrections of O(alpha G_F) have been calculated in the QED-enhanced phenomenological model, incorporating the bound-state mesons as its degrees of freedom, and matched to a similar calculation on the level of constituent partons in the full Standard Model.
• Consequently, the effects arising due to corrections of the partial decay widths on the extraction of the CKM matrix elements |V_cb| and |V_ub| are detailed.
• Further, the results of two independent Monte-Carlo implementations are presented: One is the dedicated, strict fixed-order generator BLOR, and the other is embedded into the generic Yennie-Frautschi-Suura-type resummation of Photons++, which is part of the multi-purpose event generator Sherpa.