Journée de la saveur à IJCLab

Towards a measurement of RK∗ at high-q2 (15'+3')

2 juin 2023, 14:00

18m

200/0-Auditorium - Auditorium P. Lehmann (IJCLab)

Orateur

Dr Guillaume Pietrzyk (IJCLab)

Description

In December 2022, LHCb released a new test a lepton flavor universality through the simultaneous measurement of $R_K$ and $R_{K^{\ast }}$ in two intervals of the dilepton invariant mass: $q^2\in [0.1,1.1]{\text{GeV}}^2$ (low-$q^2$) and $q^2\in [1.1,6.0]{\text{GeV}}^2$ (central-$q^2$). This talk presents the analysis of a measurement of $R_{K^{\ast }}$ in a region of high values of $q^2$, located above the $J/\psi$ and $\psi (2S)$ resonances and never performed by LHCb. In particular, this challenging measurement demands a high control of the pollution of $\psi (2S)$ contributions.

Documents de présentation

guillaume-rkstar-highq2.pdf