https://doi.org/10.1140/epja/i2018-12523-5
Regular Article - Theoretical Physics
Electromagnetic transition form factors of the Roper resonance in baryon chiral perturbation theory
1
Center for Elementary Particle Physics, ITP, Ilia State University, 0162, Tbilisi, Georgia
2
Helmholtz Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics, Universität Bonn, D-53115, Bonn, Germany
* e-mail: mishagelenava@yahoo.com
Received:
9
October
2017
Accepted:
26
April
2018
Published online:
29
May
2018
We consider the electromagnetic transition form factors of the Roper resonance in the framework of an effective field theory of pions, nucleons and delta and Roper resonances as explicit degrees of freedom. We fit two free parameters to experimental data for the N(1440) photon decay helicity amplitudes 
taken from PDG and make predictions for the 
dependence of these amplitudes. We also estimate the contributions of the delta resonances.
© SIF, Springer-Verlag GmbH Germany, part of Springer Nature, 2018
