Chiral perturbation approach to the {ital pp}{r_arrow}{ital pp}{pi}{sup 0} reaction near threshold

Journal Article · Mon Apr 01 04:00:00 EST 1996 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.53.1519· OSTI ID:282109

Park, B; Myhrer, F; Morones, J R; Meissner, T; Kubodera, K ^[1]

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1. Department of Physics and Astronomy, University of South Carolina, Columbia, South Carolina 29208 (United States)

The usual theoretical treatments of the near-threshold {ital pp}{r_arrow}{ital pp}{pi}{sup 0} reaction are based on various phenomenological Lagrangians. In this work we examine the relationship between these approaches and a systematic chiral perturbation method. Our chiral perturbation calculation indicates that the pion rescattering term should be significantly enhanced as compared with the traditional phenomenological treatment, and that this term should have substantial energy and momentum dependence. An important consequence of this energy-momentum dependence is that, for a representative threshold kinematics and within the framework of our semiquantitative calculation, the rescattering term interferes destructively with the Born term in sharp contrast to the constructive interference obtained in the conventional treatment. This destructive interference makes theoretical cross sections for {ital pp}{r_arrow}{ital pp}{pi}{sup 0} much smaller than the experimental values, a feature that suggests the importance of the heavy-meson exchange contributions to explain the experimental data. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 282109
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 4 Vol. 53; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CHIRAL SYMMETRY
CROSS SECTIONS
LAGRANGIAN FUNCTION
PERTURBATION THEORY
PIONS NEUTRAL
PROTON-PROTON INTERACTIONS
THRESHOLD ENERGY