Aug 8 – 13, 2022
Hörsaalzentrum Poppelsdorf
Europe/Berlin timezone

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

Aug 8, 2022, 2:40 PM
CP1-HSZ/1.002 (CP1-HSZ) - HS6 (CP1-HSZ)

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


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


Luka Leskovec (Jozef Stefan Institute)


$V_{ub}$ 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.

Primary author

Luka Leskovec (Jozef Stefan Institute)


Stefan Meinel (University of Arizona) Dr Marcus Petschlies (Helmholtz-Instituts für Strahlen- und Kernphysik) Constantia Alexandrou Andrew Pochinsky (MIT) Gumaro Rendon (Brookhaven National Laboratory) John Negele (MIT) Srijit Paul (Johannes Gutenberg University Mainz)

Presentation materials