2017 Impact factor 2.799
Hadrons and Nuclei


Eur. Phys. J. A 11, 105-111 (2001)

The role of hyperon resonances in $p(\gamma, K^+)\Lambda$ processes

S. Janssen, J. Ryckebusch, W. Van Nespen, D. Debruyne and T. Van Cauteren

Department of Subatomic and Radiation Physics, Ghent University, Proeftuinstraat 86, B-9000 Gent, Belgium

stijn.janssen@rug.ac.be
jan.ryckebusch@rug.ac.be

(Received: 8 February 2001 / Revised version: 19 April 2001 Communicated by Th. Walcher)

Abstract
We discuss the role of hyperon resonances in the u-channel when modeling $p \left( \gamma, K^+ \right) \Lambda$ processes in an effective Lagrangian approach. Without the introduction of hyperon resonances, one is forced to use soft hadronic form factors with a cutoff mass which is at best two times the kaon mass. After inclusion of the hyperon resonances in the u-channel, we obtain a fair description of the data with a cutoff mass of the order of 1.8 GeV.

PACS
13.60.Le - Meson production.
14.20.Jn - Hyperons.
14.20.Gk - Baryon resonances with S=0 .

© Società Italiana di Fisica, Springer-Verlag 2001