Hyperon–nucleon interactions—a chiral effective field theory approach

Abstract

We construct the leading order hyperon-nucleon potential in chiral effective field theory. We show that a good description of the available data is possible and discuss briefly further improvements of this scheme.

Baryon-baryon interactions from Effective Field Theory

“…[13], [15] and [17]. The LO potential consists of four-baryon contact terms without derivatives and of one-pseudoscalar-meson exchanges.…”

“…For the F/(F + D)-ratio we adopt here the SU(6) value (α = 0.4) which was already used in our study of the YN system [13].…”

StrangenessS=−1hyperon-nucleon scattering in covariant chiral effective field theory

“…In solving both integral equations, we multiply the potentials by the following Gaussian form factor in momentum space, as it was done in Refs. [27,29],…”

“…Because of the exploratory nature of this work, however, we are content with using the value of the S-wave Λp scattering length from Ref. [27], which was shown to reproduce a reasonable value for the hypertriton binding energy [85].…”

“…Generalization of the method included antinucleon-nucleon [22], hyperon-hyperon [23][24][25][26], and hyperon-nucleon interactions [27][28][29][30]-our focus in the present paper. The main advantage of this approach is that the description of experimental data can be systematically improved by calculating higher orders following a power counting scheme.…”