[Formula Presented] 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

3 Scopus citations


Power-counting arguments are used to organize the interactions contributing to the [Formula Presented] 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 [Formula Presented] the computed cross sections are considerably smaller than the data. We discuss possible origins of this discrepancy.

Original languageEnglish (US)
Pages (from-to)12
Number of pages1
JournalPhysical Review C - Nuclear Physics
Issue number3
StatePublished - 2000

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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