Chiral Three-Nucleon Forces from p-wave Pion Production

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.

4 pages, 3 figures

References in corpus (3)

• The N N -> NN pi+ Reaction near Threshold in a Chiral Power Counting Approach
• Measurement of Partial-Wave Contributions in pp --> pp pi^0
• Spin Correlation Coefficients in pp-->pnpi+ from 325 to 400 MeV

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• Dispersive and absorptive corrections to the pion-deuteron scattering length
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• Heavy-particle formalism with Foldy-Wouthuysen representation
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• Measurement of spin observables in the quasi-free np-> {pp}_s pi- reaction at 353 MeV
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