https://doi.org/10.1140/epja/i2005-10160-9
Original Article
Direct calculation of the K-matrix for pion electro-production in the delta channel
1
Department of Physics and Centre for Computational Physics, University of Coimbra, 3004-516, Coimbra, Portugal
2
Department of Physics, University of Beira Interior, 6201-001, Covilh a, Portugal
3
Faculty of Education, University of Ljubljana and J. Stefan Institute, 1000, Ljubljana, Slovenia
4
Faculty of Mathematics and Physics, University of Ljubljana and J. Stefan Institute, 1000, Ljubljana, Slovenia
* e-mail: bojan.golli@ijs.si
Received:
20
June
2005
Accepted:
28
September
2005
Published online:
26
October
2005
We present a method to calculate directly the K-matrix for the pion electro-production processes in the framework of chiral quark models which allows for a clean separation of the resonant amplitudes from the background. The method is applied to the calculation of the multipole amplitudes M1+, E1+, and S1+ in the Δ channel within the Cloudy Bag Model. A good overall description is found in a broad energy range.
PACS: 12.39.-x Phenomenological quark models – / 13.40.Gp Electromagnetic form factors – / 13.60.Le Meson production –
© Società Italiana di Fisica and Springer-Verlag, 2005
