Dynamical coupled-channels analysis of p(e,e'pi)N reactions
We have performed a dynamical coupled-channels analysis of available p(e,e′π)N data in the region of W⩽1.6 GeV and Q2⩽1.45 (GeV/c)2. The channels included are γ*N, πN, ηN, and ππN that has πΔ, ρN, and σN components. With the hadronic parameters of the model determined in our previous investigations of πN→πN, ππN reactions, we have found that the available data in the considered W⩽1.6 GeV region can be fitted well by only adjusting the bare γ*N→N* helicity amplitudes for the lowest N* states in P33, P11, S11, and D13 partial waves. The sensitivity of the resulting parameters to the amount of data included in the analysis is investigated. The importance of coupled-channels effect on the p(e,e′π)N cross sections is demonstrated. The meson cloud effect, as required by the unitarity conditions, on the γ*N→N* form factors are also examined. Necessary future developments, both experimentally and theoretically, are discussed.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- AC05-06OR23177
- OSTI ID:
- 977155
- Report Number(s):
- JLAB-THY-09-966; DOE/OR/23177-0713; TRN: US1002802
- Journal Information:
- Physical Review C, Vol. 80, Issue 2
- Country of Publication:
- United States
- Language:
- English
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