DOUBLE POLES OF THE S-MATRIX IN A 2-CHANNEL MODEL

Authors
VANROOSE W VANLEUVEN P ARICKX F BROECKHOVE J
Citation
W. Vanroose et al., DOUBLE POLES OF THE S-MATRIX IN A 2-CHANNEL MODEL, Journal of physics. A, mathematical and general, 30(15), 1997, pp. 5543-5549
Citations number
8
Categorie Soggetti
Physics
Journal title
Journal of physics. A, mathematical and general → ACNP
ISSN journal
03054470
Volume
30
Issue
15
Year of publication
1997
Pages
5543 - 5549
Database
ISI
SICI code
0305-4470(1997)30:15<5543:DPOTSI>2.0.ZU;2-A
Abstract
The poles of the S-matrix for a two-channel model with square well pot entials are calculated. It is found that the trajectories of these pol es in the complex k-plane for varying coupling strength show avoided c rossings. At the critical parameters the poles coincide to form a doub le pole. Its presence is revealed by a symmetry property of the cross section.