Spectral representation for u- and t-channel exchange processes in a partial-wave decomposition
High Energy Physics - Phenomenology
2015-07-22 v1
Abstract
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.
Cite
@article{arxiv.1506.02375,
title = {Spectral representation for u- and t-channel exchange processes in a partial-wave decomposition},
author = {M. F. M. Lutz and E. E. Kolomeitsev and C. L. Korpa},
journal= {arXiv preprint arXiv:1506.02375},
year = {2015}
}
Comments
35 pages, 7 figures