"soft-pion" production in the reaction NNNN

J. Dubach, R. R. Silbar, W. M. Kloet

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


We examine the reaction NNNN for "soft-pion" kinematics (p=0 in the center of mass). An earlier calculation based on the Adler-Dothan theorem severely underestimated the p=0 cross section for ppnp+ at 740 MeV. We attempt to understand this discrepancy in the context of a relativistic, unitary, three-body isobar model. The postemission -pole contributions are shown to be very important, even for these "soft-pion" kinematics. Relatively high partial waves in the NNN isobar amplitude are significant. However, after summing all the postemission and preemission diagrams, the discrepancy with experiment is only partially removed.

Original languageEnglish (US)
Pages (from-to)2761-2771
Number of pages11
JournalPhysical Review D
Issue number11
StatePublished - 1980

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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