Speaker
Description
The study of rare semileptonic $B$ decays such as $B \to K^* \ell^+ \ell^-$ offers a sensitive probe of the Standard Model and potential new physics, but a key theoretical challenge for lattice QCD is the treatment of the resonant $K^*$ in the final state. Traditional calculations rely on the narrow-width approximation, treating the $K^*$ as stable. In this talk, I present first steps towards going beyond this approximation by studying $K\pi$ scattering on an RBC/UKQCD ensemble and extracting information about the $P$-wave channel relevant to the $K^*$. I will discuss the methodology, show initial results for the finite-volume spectrum and phase shift, and outline the path toward determining $B \to K\pi$ matrix elements in a fully dynamical framework.
| Parallel Session (for talks only) | Quark and lepton flavor physics |
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