dorsal/arxiv
View Scheman + p -> d + gamma in Effective Field Theory
| Authors | Martin J. Savage, Kevin A. Scaldeferri, Mark B. Wise |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9811029 |
| URL | https://arxiv.org/abs/nucl-th/9811029 |
| DOI | 10.1016/S0375-9474(99)00146-3 |
| Journal | Nucl.Phys. A652 (1999) 273-286 |
Abstract
The radiative capture process n+p-> d+gamma provides clear evidence for meson exchange currents in nuclear physics. We compute this process at low energies using a recently developed power counting for the effective field theory that describes nucleon-nucleon interactions. The leading order contribution to this process comes from the photon coupling to the nucleon magnetic moments. At subleading order there are other contributions. Among these are graphs where the photon couples directly to pions, i.e. meson exchange currents. These diagrams are divergent and require the presence of a local four-nucleon-one photon counterterm. The coefficient of this operator is determined by the measured cross section, 334.2 +- 0.5 mb, for incident neutrons with speed |v|=2200 m/s.
{
"annotation_id": "18cd34e7-6563-4c49-a82e-d77bd932be16",
"date_created": "2026-03-02T18:00:25.423000Z",
"date_modified": "2026-03-02T18:00:25.423000Z",
"file_hash": "55674b786e9fc29781cc3df24cb7bef89c81c94e1b6a158703dbfd62be070727",
"private": false,
"record": {
"abstract": "The radiative capture process n+p-\u003e d+gamma provides clear evidence for meson\nexchange currents in nuclear physics. We compute this process at low energies\nusing a recently developed power counting for the effective field theory that\ndescribes nucleon-nucleon interactions. The leading order contribution to this\nprocess comes from the photon coupling to the nucleon magnetic moments. At\nsubleading order there are other contributions. Among these are graphs where\nthe photon couples directly to pions, i.e. meson exchange currents. These\ndiagrams are divergent and require the presence of a local four-nucleon-one\nphoton counterterm. The coefficient of this operator is determined by the\nmeasured cross section, 334.2 +- 0.5 mb, for incident neutrons with speed\n|v|=2200 m/s.",
"arxiv_id": "nucl-th/9811029",
"authors": [
"Martin J. Savage",
"Kevin A. Scaldeferri",
"Mark B. Wise"
],
"categories": [
"nucl-th",
"hep-ph"
],
"doi": "10.1016/S0375-9474(99)00146-3",
"journal_ref": "Nucl.Phys. A652 (1999) 273-286",
"title": "n + p -\u003e d + gamma in Effective Field Theory",
"url": "https://arxiv.org/abs/nucl-th/9811029"
},
"schema_id": "dorsal/arxiv",
"source": {
"execution_id": "56888652-e6cd-421a-a676-4864e946fc84",
"id": "arXiv Dataset IDs",
"type": "Model",
"variant": "snapshot-2026-03-01",
"version": "0.1.0"
},
"user_id": 1000002
}