# 9th Edition of the Large Hadron Collider Physics Conference

7-12 June 2021
Zoom
Europe/Paris timezone

## Impact of Soft Photons on $B\to K\ell^+\ell^-$

Jun 10, 2021, 6:45 PM
1h
Zoom

#### Zoom

Theory poster Flavour physics

Dayanand Mishra

### Description

In this talk, we will be discussing $\mathcal{O}(\alpha)$ QED corrections to $B\to K\ell^+\ell^-$ modes. The structure of the contact term is fixed by requiring the gauge invariance of the real emission amplitude. The calculation is done by providing fictitious mass ($\lambda$) to the photon, which acts as IR regulator and results are shown to be independent of it. QED effects are found to be negative. Electron channels are shown to receive large correction $\mathcal{O}(20\%)$. We will also discuss its impact on lepton flavour universality (LFU) ratio ($R_{K}^{\mu e}$).

### Primary authors

Prof. Namit Mahajan (Physical Research Laboratory )

### Presentation materials

 LHCP2021 .pdf Poster introduction Zoom meeting room