Chiral Three-Nucleon Forces from p-wave Pion Production

Hanhart, C.; van Kolck, U.; Miller, G. A.

Chiral Three-Nucleon Forces from p-wave Pion Production

Authors

Hanhart, C.

van Kolck, U.

Miller, G. A.

Description

Production of p-wave pions in nucleon-nucleon collisions is studied according to an improved power counting that embodies the constraints of chiral symmetry. Contributions from the first two non-vanishing orders are calculated. We find reasonable convergence and agreement with data for a spin-triplet cross section in $pp\to ppπ^0$,with no free parameters. Agreement with existing data for a spin-singlet cross section in $pp\to pnπ^+$ constrains a short-range operator shown recently to contribute significantly to the three-nucleon potential.
4 pages, 3 figures