# Joint Annual Meeting of ÖPG and SPS 2021

August 30, 2021 to September 3, 2021
University of Innsbruck
Europe/Zurich timezone

## 【315】Study of a very rare decay with multiple leptons in the final state at the LHCb experiment

Aug 31, 2021, 5:45 PM
15m
Room B

### Room B

Talk Nuclear, Particle- and Astrophysics (FAKT - TASK)

### Speaker

Sonia Amina Bouchiba (EPFL - Ecole Polytechnique Federale Lausanne (CH))

### Description

Particles decays with muons coming from a virtual photon in the final state are theoretically promising. In particular the discarding of helicity suppression for such channel is an advantage for leptonic flavour universality (LFU) testing in very rare $b$ hadron decay modes. The abundant channel $B^+\rightarrow K^+J/\psi\gamma^*(\rightarrow\mu^+\mu^-)$ can be studied with the available dataset at the LHCb experiment. The search is done with a centralized selection made on $J/\psi\rightarrow \mu^+\mu^-$ to explore offline reconstruction capabilities for a soft muon pair. Emphasis is brought on the study of the associated fully and partially reconstructed misidentified background. The knowledge on handling these soft muons is crucial for future exploration at LHCb.

### Primary authors

Lesya Shchutska (EPFL - Ecole Polytechnique Federale Lausanne (CH)) Sonia Amina Bouchiba (EPFL - Ecole Polytechnique Federale Lausanne (CH)) Vitalii Lisovskyi (Technische Universitaet Dortmund (DE))

### Presentation materials

 SPS_LHCbMutlilepton_SoniaBouchiba.pdf SPS_LHCbMutlilepton_SoniaBouchiba.pdf SPS_LHCbMutlilepton_SoniaBouchiba.pptx