Chiral EFT predictions at N2LO for the tritium Gamow-Teller matrix element, with parameters fixed from scattering, overestimate the empirical value and indicate large higher-order corrections.
Chiral Three-Nucleon Forces from p-wave Pion Production
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abstract
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 $pp\to pp\pi^0$,with no free parameters. Agreement with existing data for a spin-singlet cross section in $pp\to pn\pi^+$ constrains a short-range operator shown recently to contribute significantly to the three-nucleon potential.
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Challenging chiral EFT with tritium beta decay
Chiral EFT predictions at N2LO for the tritium Gamow-Teller matrix element, with parameters fixed from scattering, overestimate the empirical value and indicate large higher-order corrections.