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

Understand

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.