ICHEP 2024

Bs→μ+μ−γ at large q2 from lattice QCD

20 Jul 2024, 11:45

15m

North Hall

Parallel session talk 06. Strong Interactions and Hadron Physics Strong interactions and Hadron Physics

Speaker

Giuseppe Gagliardi

Description

We present a first-principles lattice QCD calculation of the local form factors describing the $B_s\to {\mu }^{+}{\mu }^{-}\gamma$ decay. We focus on the region of large di-muon invariant masses $\sqrt{q^2}\gtrsim 4.2\mathrm{G}\mathrm{e}\mathrm{V}$, where the contributions from the four-quarks operators in the effective weak Hamiltonian (which are neglected at present) are expected to be small. We use our results for the form factors to determine the branching fraction for $B_s\to {\mu }^{+}{\mu }^{-}\gamma$, which has been recently measured by the LHCb in the region $\sqrt{q^2}>4.9\mathrm{G}\mathrm{e}\mathrm{V}$.

Presentation materials

prague2024.pdf