Abstract
We study the analytic structure of partial-wave amplitudes derived from - and -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 illustrated at hand of ten specific processes.
- Received 8 June 2015
DOI:https://doi.org/10.1103/PhysRevD.92.016003
© 2015 American Physical Society