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Direct calculation of the K-matrix for pion electro-production in the delta channel

  • P. Alberto
  • L. Amoreira
  • M. Fiolhais
  • B. GolliEmail author
  • S. Širca
Original Article

Abstract.

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 

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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2005

Authors and Affiliations

  • P. Alberto
    • 1
  • L. Amoreira
    • 2
  • M. Fiolhais
    • 1
  • B. Golli
    • 3
    Email author
  • S. Širca
    • 4
  1. 1.Department of Physics and Centre for Computational PhysicsUniversity of CoimbraCoimbraPortugal
  2. 2.Department of PhysicsUniversity of Beira InteriorCovilh aPortugal
  3. 3.Faculty of EducationUniversity of Ljubljana and J. Stefan InstituteLjubljanaSlovenia
  4. 4.Faculty of Mathematics and PhysicsUniversity of Ljubljana and J. Stefan InstituteLjubljanaSlovenia

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