# EPS-HEP2019

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

### 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)