Spectral representation for u- and t-channel exchange processes in a partial-wave decomposition
| Autor: | Lutz, M. F. M., Kolomeitsev, E. E., Korpa, C. L. |
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| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Phys. Rev. D 92, 016003 (2015) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevD.92.016003 |
| Popis: | We study the analytic structure of partial-wave amplitudes derived from u- and t-channel exchange processes. The latter plays a crucial role in dispersion-theory approaches to coupled-channel systems that model final state interactions in QCD. A general spectral representation is established that is valid in the presence of anomalous thresholds, decaying particles or overlapping left-hand and right-hand cut structures as it occurs frequently in hadron physics. The results are exemplified at hand of ten specific processes. Comment: 35 pages, 7 figures |
| Databáze: | arXiv |
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