Momentum distributions of quarks/gluons inside a light baryon in a hard exclusive process are encoded in the light-cone distribution amplitudes (LCDAs). In this work, we point out that the leading twist LCDAs of a light baryon can be obtained through a simulation of a quasi-distribution amplitude calculable on lattice QCD within the framework of the large-momentum effective theory. We calculate the one-loop perturbative contributions to LCDA and quasi-distribution amplitudes and explicitly demonstrate the factorization of quasi-distribution amplitudes at the one-loop level. Based on the perturbative results, we derive the matching kernel in the MS scheme and regularization-invariant momentum-subtraction scheme. Our result provides a first step to obtaining the LCDA from first principle lattice QCD calculations in the future.
@article{arxiv.2304.09004,
title = {Light-cone distribution amplitudes of a light baryon in large-momentum effective theory},
author = {Zhi-Fu Deng and Chao Han and Wei Wang and Jun Zeng and Jia-Lu Zhang},
journal= {arXiv preprint arXiv:2304.09004},
year = {2023}
}