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Valence quark contributions for the gamma N -> P11(1440) transition

Authors
  • Ramalho, G.
  • Tsushima, K.
Type
Preprint
Publication Date
Oct 13, 2010
Submission Date
Oct 13, 2010
Identifiers
DOI: 10.1063/1.3647158
Source
arXiv
License
Yellow
External links

Abstract

A covariant spectator quark model is applied to estimate the valence quark contributions to the$ F1*(Q2) and F2*(Q2) transition form factors for the gamma N -> P11(1440) reaction. The Roper resonance, P11(1440), is assumed to be the first radial excitation of the nucleon. The model requires no extra parameters except for those already fixed by the previous studies for the nucleon. The results are consistent with the experimental data in the high Q2 region, and those from the lattice QCD. Finally the model is also applied to estimate the meson cloud contributions from the CLAS and MAID analysis.

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