  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. It is on the same level of quality as the one obtained by the most
advanced phenomenological hyperon-nucleon interaction models.
