https://doi.org/10.1140/epja/i2007-10576-1
Regular Article - Theoretical Physics
The physical meaning of scattering matrix singularities in coupled-channel formalisms⋆
BRAG 2007 Workshop summary
1
Department of Physics, Florida State University, 32306-4350, Tallahassee, FL, USA
2
Rudjer Bošković Institute, Bijenička cesta 54, P.O. Box 180, 10002, Zagreb, Croatia
3
Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, Johann-Joachim-Becher-Weg 45, D-55099, Mainz, Germany
4
Dipartimento di Fisica, Università degli Studi di Genova and INFN, Sezione di Genova, Genova, Italy
5
Institut für Kernphysik, Forschungszentrum Jülich, 52425, Jülich, Germany
6
Physics Division, Argonne National Laboratory, 60439, Argonne, IL, USA
7
Excited Baryon Analysis Center, Thomas Jefferson National Accelerator Facility, 22901, Newport News, VA, USA
8
Department of Physics, Osaka University, 560-0043, Toyonaka, Osaka, Japan
* e-mail: tiator@kph.uni-mainz.de
Received:
12
November
2007
Accepted:
21
January
2008
Published online:
15
April
2008
The physical meaning of bare and dressed scattering matrix singularities has been investigated. Special attention has been attributed to the role of the well-known invariance of the scattering matrix with respect to the field transformation of the effective Lagrangian. Examples of evaluating bare and dressed quantities in various models are given.
PACS: 11.80.Gw Multichannel scattering – / 13.60.Le Meson production – / 13.75.Cs Nucleon-nucleon interactions (including antinucleons, deuterons, etc.)[ :AND:]14.20.Gk Baryon resonances with S = 0 –
© Società Italiana di Fisica and Springer-Verlag, 2008
