Jul 10 – 17, 2019
Ghent
Europe/Brussels timezone

Charm-loop effect in rare B->K(*)ll decays beyond leading twist

Jul 13, 2019, 10:30 AM
20m
Campus Ledeganck - Aud. 5 (Ghent)

Campus Ledeganck - Aud. 5

Ghent

Parallel talk Flavour Physics and CP Violation Flavour Physics and CP Violation

Speaker

Nico Gubernari (technische universität münchen)

Description

We revisit soft gluon contributions to the "charm loop" effect in rare $B\to K^{(*)}ll$ decays, which is a large systematic uncertainty in the interpretation of the b-anomalies. Since these contributions are dominated by long-distance effects and are resistant to factorization attempts, we employ the method of light-cone sum rules to compute the relevant hadronic matrix elements. Our calculation extends previous works by considering the full set of the three-particle B-meson distribution amplitudes. We provide first numerical results, and discuss qualitatively their impact on the extraction of the Wilson coefficient $C_9$.

Primary authors

Nico Gubernari (technische universität münchen) Javier Virto (Massachussets Institute of Technology) Danny van Dyk (TU München)

Presentation materials