ICHEP 2024

Analysis of local and non-local amplitudes in the B0→K∗0μ+μ− decay

19 Jul 2024, 15:00

15m

South Hall 1B

Parallel session talk 05. Quark and Lepton Flavour Physics Quark and Lepton Flavour Physics

Speaker

Martin Andersson (University of Zurich (CH))

Description

The $B^0\to K^{\ast 0}{\mu }^{+}{\mu }^{-}$ decay is mediated via the rare flavour changing neutral current transition $b\to s{\ell }^{+}{\ell }^{-}$, and constitute sensitive probes for New Physics (NP), as they are forbidden at tree-level in the SM. Virtual NP contributions can therefore have a large impact, and previous LHCb measurements of the decay have shown interesting tensions with the SM predictions at the level of $\sim 3\sigma$. The theoretical interpretation of the anomalies is difficult due to the uncertainties in non-local SM contributions, such as charm-loops $b\to sc\overline{c}(\to \gamma )$, which could mimic NP effects. This talk discusses the results from a data-driven approach to constraining the size of the charm-loops and other non-local contributions to the $B^0\to K^{\ast 0}{\mu }^{+}{\mu }^{-}$ amplitude, in the first measurement to parameterise full dimuon invariant mass spectrum. The results are obtained using an integrated luminosity of $8.4\mathrm{f}{\mathrm{b}}^{-1}$ collected by the LHCb experiment.

Presentation materials

ICHEP2024_B_Kstmumu_LHCb_MAndersson.pdf