Scalar-meson production in nucleon-nucleon collisions near threshold

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Rekalo M., Tomasi-Gustafsson E.

EUROPEAN PHYSICAL JOURNAL A, vol.18, no.4, pp.697-709, 2003 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 18 Issue: 4
  • Publication Date: 2003
  • Doi Number: 10.1140/epja/i2003-10060-0
  • Journal Name: EUROPEAN PHYSICAL JOURNAL A
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.697-709
  • Middle East Technical University Affiliated: No

Abstract

We establish the model-independent spin structure of the matrix elements for the near-threshold scalar-meson production in pp and np collisions, when the final particles are emitted in S-state. Polarization phenomena are derived in a general form. The properties of the t-channel dynamics, which is based on different meson exchanges, are studied in terms of the s-channel parametrization of the matrix element. The predictions of a model, based on pi + sigma exchanges are also presented.