Valence quark contributions for the gamma N -> P11(1440) transition
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.
- Research Organization:
- Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- AC05-06OR23177
- OSTI ID:
- 1010442
- Report Number(s):
- JLAB-THY-10-1269; DOE/OR/23177-1437; arXiv:1010.2765
- Conference Information:
- Journal Name: Few Body Syst. Journal Issue: 1-4 Journal Volume: 49
- Country of Publication:
- United States
- Language:
- English
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