Hyperon-nucleon interaction at next-to-leading order in chiral effective field theory

Understand

Results for the Lambda N and Sigma N interactions obtained at next-to-leading order in chiral effective field theory are reported.

• At the order considered there are contributions from one- and two-pseudoscalar-meson exchange diagrams and from four-baryon contact terms without and with two derivatives.
• SU(3) flavor symmetry is imposed for constructing the hyperon-nucleon interaction while the explicit SU(3) symmetry breaking by the physical masses of the pseudoscalar mesons (pi, K, eta) is taken into account.
• An excellent description of the hyperon-nucleon system can be achieved at next-to-leading order.