Scattering of charmed baryons on nucleons

TL;DR

This paper uses chiral effective field theory to extrapolate lattice QCD results on the $\Lambda_c N$ interaction to physical quark masses, predicting a moderately attractive interaction that could allow bound multi-baryon systems with a $\Lambda_c$ baryon.

Contribution

It provides a novel extrapolation method for $\Lambda_c N$ interactions from lattice QCD without relying on flavor symmetry assumptions.

Findings

Moderately attractive $\Lambda_c N$ interaction at physical pion mass.

Scattering lengths around -1 fm for key partial waves.

Bound multi-baryon systems with $\Lambda_c$ are possible.

Abstract

Chiral effective field theory is utilized for extrapolating results on the $\Lambda_c N$ interaction, obtained in lattice QCD at unphysical (large) quark masses, to the physical point. The pion-mass dependence of the components that constitute the $\Lambda_c N$ potential up to next-to-leading order (pion-exchange diagrams and four-baryon contact terms) is fixed by information from lattice QCD simulations. No recourse to SU(3) or SU(4) flavor symmetry is made. It is found that the results of the HAL QCD Collaboration for quark masses corresponding to $m_\pi = 410$--$570$ MeV imply a moderately attractive $\Lambda_c N$ interaction at $m_\pi = 138$ MeV with scattering lengths of $a\approx -1$ fm for the $^1S_0$ as well as the $^3S_1$ partial waves. For such an interaction the existence of a charmed counterpart of the hypertriton is unlikely but four- and/or five-baryons systems with a $\Lambda_c$ baryon could be indeed bound.