Light-cone distribution amplitudes of octet baryons from lattice QCD

TL;DR

This paper provides lattice QCD calculations of the wave function normalization constants and distribution amplitudes for octet baryons, enabling more precise understanding of their internal quark structure.

Contribution

It offers the first comprehensive lattice QCD analysis of octet baryon distribution amplitudes with controlled continuum and volume extrapolations.

Findings

Discretization effects explain previous flavor symmetry violations.

Results are consistent with flavor symmetry constraints in the continuum limit.

Provides wave function normalization constants for octet baryons.

Abstract

We present lattice QCD results for the wave function normalization constants and the first moments of the distribution amplitudes for the lowest-lying baryon octet. The analysis is based on a large number of $N_f=2+1$ ensembles comprising multiple trajectories in the quark mass plane including physical pion (and kaon) masses, large volumes, and, most importantly, five different lattice spacings down to $a=0.039\,\mathrm{fm}$. This allows us to perform a controlled extrapolation to the continuum and infinite volume limits by a simultaneous fit to all available data. We demonstrate that the formerly observed violation of flavor symmetry breaking constraints can, indeed, be attributed to discretization effects that vanish in the continuum limit.