Threshold neutral pion photoproduction off the tri-nucleon to O(q^4)
| Autor: | Evgeny Epelbaum, Mark Lenkewitz, H.-W. Hammer, Ulf-G. Meißner |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Nuclear and High Energy Physics
Particle physics Chiral perturbation theory Nuclear Theory partial wave FOS: Physical sciences photoproduction [pi0] 4 [higher-order] 01 natural sciences Nuclear Theory (nucl-th) Cross section (physics) Pion High Energy Physics - Phenomenology (hep-ph) 0103 physical sciences Bound state threshold Effective field theory ddc:530 numerical calculations 010306 general physics Nuclear Experiment electric [multipole] chiral [effective field theory] nuclide [helium] Physics tritium 010308 nuclear & particles physics higher-order [perturbation theory] Baryon nuclear reaction [photon nucleus] High Energy Physics - Phenomenology three-body problem Nucleon Multipole expansion |
| Zdroj: | The European physical journal / A 49(2), 20 (2013). doi:10.1140/epja/i2013-13020-1 |
| DOI: | 10.48550/arxiv.1209.2661 |
| Popis: | We calculate electromagnetic neutral pion production off tri-nucleon bound states (3H, 3He) at threshold in chiral nuclear effective field theory to fourth order in the standard heavy baryon counting. We show that the fourth order two-nucleon corrections to the S-wave multipoles at threshold are very small. This implies that a precise measurement of the S-wave cross section for neutral pion production off 3He allows for a stringent test of the chiral perturbation theory prediction for the S-wave electric multipole E_{0+}^{pi0 n}. Comment: 17 pages, 5 figures, title changed, final version to appear in EPJA. arXiv admin note: substantial text overlap with arXiv:1103.3400 |
| Databáze: | OpenAIRE |
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