Form factors for the charm-baryon semileptonic decay $\Xi_c\to \Xi \ell \nu$ from domain-wall lattice QCD

TL;DR

This paper presents a lattice QCD calculation of form factors for the semileptonic decay of the charm baryon $\\Xi_c$ to $\\Xi$, providing more precise theoretical inputs to interpret recent experimental measurements.

Contribution

The study introduces a lattice QCD calculation of decay form factors using domain-wall fermions and anisotropic clover action, with results larger than previous lattice estimates.

Findings

Preliminary form factors are larger in magnitude than previous results.

Used four ensembles with varying lattice spacings and pion masses.

Provides essential theoretical input for interpreting experimental data.

Abstract

Recent experimental progress measuring the branching fractions of the heavy-baryon semileptonic decays $\Xi_c\to \Xi \ell \nu$ has stimulated theoretical interest and motivates precise lattice calculations of the form factors. Here we present such a calculation using domain-wall fermions for the up, down, and strange quarks, and an anisotropic clover action for the charm quark. We use four ensembles generated by the RBC and UKQCD collaborations, with lattice spacings between 0.111 and 0.073 fm and pion masses ranging from 420 to 230 MeV. Our preliminary results for the form factors are larger in magnitude than previous lattice results.