Strangeness $S=-1$ hyperon-nucleon scattering in covariant chiral effective field theory

TL;DR

This paper investigates hyperon-nucleon interactions with strangeness S=-1 using covariant chiral effective field theory, highlighting relativistic effects and improved cutoff dependence at leading order.

Contribution

It applies a covariant framework to hyperon-nucleon scattering, demonstrating reduced cutoff dependence and comparable data description at leading order.

Findings

Cutoff dependence is reduced compared to heavy-baryon approach.

Relativistic effects are relevant in hyperon-nucleon interactions.

Quantitative description of data remains similar at leading order.

Abstract

Motivated by the successes of covariant baryon chiral perturbation theory in one-baryon systems and in heavy-light systems, we study relevance of relativistic effects in hyperon-nucleon interactions with strangeness $S=-1$. In this exploratory work, we follow the covariant framework developed by Epelbaum and Gegelia to calculate the $YN$ scattering amplitude at leading order. By fitting the five low-energy constants to the experimental data, we find that the cutoff dependence is mitigated, compared with the heavy-baryon approach. Nevertheless, the description of the experimental data remains quantitatively similar at leading order.