May 20 – 22, 2019
Max Planck Institute for Astrophysics (MPA)
Europe/Berlin timezone

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

May 22, 2019, 12:00 PM
E.0.11 (Max Planck Institute for Astrophysics (MPA) )


Max Planck Institute for Astrophysics (MPA)

Karl-Schwarzschild-Str. 1 85748 Garching Germany


Nico Gubernari (technische universität münchen)


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 Danny van Dyk (TU München)

Presentation materials