Form factors for rare B decays: strategy, methodology, and numerical study

TL;DR

This paper explores advanced lattice QCD techniques, specifically moving NRQCD and stochastic sources, to improve the precision of form factor calculations in rare B meson decays, aiming to reduce discretisation and statistical errors.

Contribution

It introduces a combined approach using moving NRQCD and stochastic sources, demonstrating their effectiveness in enhancing lattice calculation accuracy for rare B decay form factors.

Findings

Moving NRQCD reduces discretisation errors.

Stochastic sources help lower statistical uncertainties.

Combined methods improve lattice QCD precision for B decays.

Abstract

We investigate the combined use of moving NRQCD and stochastic sources in lattice calculations of form factors describing rare B and B_s decays. Moving NRQCD leads to a reduction of discretisation errors compared to standard NRQCD. Stochastic sources are tested for reduction of statistical errors.