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SUMMARY:Towards precision Studies of B → Kπ l+ l- from Lattice QCD Beyo
 nd the Narrow-Width Approximation - Felix Erben\, CERN
DTSTART:20260130T160000Z
DTEND:20260130T170000Z
UID:TALK243124@talks.cam.ac.uk
CONTACT:Nelson Lachini
DESCRIPTION:Rare semileptonic decays mediated by the quark-level transitio
 n b → s l+ l- remain a central testing ground for the Standard Model. A 
 key hadronic uncertainty in channels such as B → K٭ l+ l- arises from t
 he resonant nature of the K٭\, which appears through the strongly interac
 ting Kπ final state rather than as an asymptotic state. While most phenom
 enological treatments and existing lattice calculations rely on the narrow
 -width or stable-particle approximation\, this simplification becomes incr
 easingly inadequate at the level of precision targeted by current and futu
 re experiments. In this talk\, I discuss recent lattice QCD work towards B
  → Kπ l+ l- form factors\, based on a fully dynamical description of th
 e Kπ system. Focusing on the P-wave channel\, I describe our calculation 
 of the finite-volume spectrum associated with the K٭ resonance. These res
 ults provide essential input for formulating and ultimately computing the 
 physical B → Kπ transition amplitudes in a framework that treats resona
 nces consistently\, without assuming a stable K٭. I will discuss implicat
 ions for precision flavor observables and future lattice studies.
LOCATION:MR19 (Potter Room\, Pavilion B)\, CMS
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