Joint Annual Meeting of ÖPG and SPS 2021

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

【307】Test of lepton flavour universality in $B^+ \to K^+l^+l^-$ decays in high dilepton invariant mass squared region

Aug 31, 2021, 3:00 PM
15m
Room B

Room B

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

Speaker

Mr Vadym Denysenko (Universitaet Zuerich (CH))

Description

The recently updated value of the ratio of branching fractions $R_K = \mathcal{B}(B^+ \to K^+\mu^+\mu^-)~/~\mathcal{B}(B^+ \to K^+e^+e^-)$ that has been calculated for a dilepton invariant mass squared range $q\mathrm{^2 \in (1.1~GeV^2,~6.0~GeV^2)}$ is in tension with the Standard Model prediction at the level of 3.1 $\sigma$. I will discuss a complementary study in the high $q\mathrm{^2 > 14~GeV^2}$ region using the same $\mathrm{9~fm^{-1}}$ of proton-proton collision data recorded by the LHCb experiment at CERN's Large Hadron Collider. The result is expected to be statistically and systematically independent of the existing central $q\mathrm{^2}$ measurement and will be a vital measurement in clarifying the presence of new physics in this system.

Primary authors

Davide Lancierini (Universitaet Zuerich (CH)) Mr Vadym Denysenko (Universitaet Zuerich (CH)) Jonas Eschle (University of Zurich) Katharina Mueller (Universitaet Zuerich (CH)) Nicola Serra (Universitaet Zuerich (CH)) Patrick Haworth Owen (Universitaet Zuerich (CH))