dorsal/arxiv
View SchemaChiral Perturbation Approach to the pp -> pp pi0 Reaction Near Threshold
| Authors | B. -Y. Park, F. Myhrer, J. R. Morones, T. Meissner, K. Kubodera |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9512023 |
| URL | https://arxiv.org/abs/nucl-th/9512023 |
| DOI | 10.1103/PhysRevC.53.1519 |
| Journal | Phys.Rev.C53:1519-1531,1996 |
Abstract
The usual theoretical treatments of the near-threshold $pp \rightarrow pp\pi^0$ 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 $pp \rightarrow pp\pi^0$ much smaller than the experimental values, a feature that suggests the importance of the heavy-meson exchange contributions to explain the experimental data.
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"abstract": "The usual theoretical treatments of the near-threshold $pp \\rightarrow\npp\\pi^0$ reaction are based on various phenomenological Lagrangians. In this\nwork we examine the relationship between these approaches and a systematic\nchiral perturbation method. Our chiral perturbation calculation indicates that\nthe pion rescattering term should be significantly enhanced as compared with\nthe traditional phenomenological treatment, and that this term should have\nsubstantial energy and momentum dependence. An important consequence of this\nenergy-momentum dependence is that, for a representative threshold kinematics\nand within the framework of our semiquantitative calculation, the rescattering\nterm interferes destructively with the Born-term in sharp contrast to the\nconstructive interference obtained in the conventional treatment. This\ndestructive interference makes theoretical cross sections for $pp \\rightarrow\npp\\pi^0$ much smaller than the experimental values, a feature that suggests the\nimportance of the heavy-meson exchange contributions to explain the\nexperimental data.",
"arxiv_id": "nucl-th/9512023",
"authors": [
"B. -Y. Park",
"F. Myhrer",
"J. R. Morones",
"T. Meissner",
"K. Kubodera"
],
"categories": [
"nucl-th",
"hep-ph"
],
"doi": "10.1103/PhysRevC.53.1519",
"journal_ref": "Phys.Rev.C53:1519-1531,1996",
"title": "Chiral Perturbation Approach to the pp -\u003e pp pi0 Reaction Near Threshold",
"url": "https://arxiv.org/abs/nucl-th/9512023"
},
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