Status of next-generation $\Lambda_b \to p, \Lambda, \Lambda_c$ form-factor calculations

TL;DR

This paper reports preliminary lattice-QCD calculations of $\Lambda_b$ decay form factors, incorporating new ensembles and improved parameter tuning for more accurate results in heavy baryon decay studies.

Contribution

It introduces next-generation lattice-QCD calculations with additional ensembles and refined tuning, advancing the precision of $\Lambda_b$ decay form-factor determinations.

Findings

Inclusion of three new ensembles enhances calculation robustness.

Improved tuning of charm and bottom quark parameters increases accuracy.

Preliminary results set the stage for more precise future analyses.

Abstract

I present preliminary results of next-generation lattice-QCD calculations of the $\Lambda_b \to p$, $\Lambda_b \to \Lambda$, and $\Lambda_b \to \Lambda_c$ form factors based on RBC/UKQCD gauge-field ensembles with 2+1 flavors of domain-wall fermions. Compared to the work published in 2015 and 2016, the new calculations include three additional ensembles (one with 139 MeV pion mass, one with 0.073 fm lattice spacing, and one with another volume) and were performed with a more accurate tuning of the charm and bottom anisotropic clover action parameters.