The 39th International Symposium on Lattice Field Theory (Lattice 2022)

A lattice QCD study of the B \to \pi\pi \ell \nu transition

8 Aug 2022, 14:40

20m

CP1-HSZ/1.002 (CP1-HSZ) - HS6 (CP1-HSZ)

Oral Presentation Weak Decays and Matrix Elements Weak Decays and Matrix Elements

Speaker

Luka Leskovec (Jozef Stefan Institute)

Description

$V_{ub}$ is the smallest and least known of all CKM matrix elements; the community determines its current value primarily through the exclusive process $B\to \pi \ell \nu$. This talk will present our progress toward a lattice QCD determination of the $V_{ub}$ matrix element from a novel transition - $B\to \pi \pi \ell \nu$ process, where the $\pi \pi$ rescattering features the $\rho (770)$ resonance as an enhancement. We perform our calculation on $N_f=2+1$ clover fermions on a lattice of $L=3.6$ fm and a pion mass of $320$ MeV. After a brief overview of the theoretical framework, we will discuss some preliminary results.

Presentation materials

leskovec_brhoelnu.pdf