NN→NNπ+ reaction near threshold in a chiral power counting approach

Carlos A. Da Rocha, Gerald A. Miller, Ubirajara Van Kolck

Research output: Contribution to journalArticlepeer-review

39 Scopus citations


Power-counting arguments are used to organize the interactions contributing to the NN→dπ,pnπ reactions near threshold. We estimate the contributions from the three formally leading mechanisms: the Weinberg-Tomozawa (WT) term, the impulse term, and the Δ-excitation mechanism. Subleading but potentially large mechanisms, including S-wave pion rescattering, the Galilean correction to the WT term, and short-ranged contributions are also examined. The WT term is shown to be numerically the largest, and the other contributions are found to approximately cancel. Similarly to the reaction pp→ppπ0, the computed cross sections are considerably smaller than the data. We discuss possible origins of this discrepancy.

Original languageEnglish (US)
Article number034613
Pages (from-to)346131-3461312
Number of pages3115182
JournalPhysical Review C - Nuclear Physics
Issue number3
StatePublished - Mar 2000

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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