3–5 Dec 2024
Mainz Institute for Theoretical Physics, Johannes Gutenberg University
Europe/Berlin timezone

Radiative corrections to $\mathcal{B}\rightarrow \ell \nu$

5 Dec 2024, 12:15
30m
Mainz Institute for Theoretical Physics, Johannes Gutenberg University

Mainz Institute for Theoretical Physics, Johannes Gutenberg University

Virtual Workshop

Speaker

Max Ferré (JGU (Mainz))

Description

In this talk I will focus on the study of the leptonic $\mathcal{B}\rightarrow \ell \nu$ at next-to-leading order in QED. The future improvements of experimental measurements of this channel require a reliable theory prediction, hence a careful theoretical estimate of QED corrections. The multi-scale character of this process requires an appropriate effective theory (EFT) construction to factorize the different contributions. In the first part of this talk, I will discuss the EFT description of the process at the partonic level, which is based on Heavy Quark Effective Theory and Soft Collinear Effective Theory. I will show how the inclusion of QED corrections demands a generalisation of the hadronic decay constant . In the second part of the talk, I will discuss the EFT description below the confinement scale using a point-like description for the B-meson. I will show that depending on the cut on final state radiation and on the lepton flavor the contribution from excited states of the B meson can become important.

Presentation materials