Phenomenological studies of CLAS data on double charge pion electroproduction
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Comprehensive studies of unpolarized pi?pi+p electroproduction cross-sections, for the first time available from CLAS [1,2], were carried out within the framework of phenomenological approach [3]. Analysis of these data allowed us to establish all important mechanisms, contributing to this exclusive channel in N* excitation region at photon virtualities from 0.2 to 1.5 GeV2. Electrocouplings for P11(1440), D13(1520) states at Q2 < 0.6GeV 2 were obtained from the analysis of CLAS data [1]. The contributions from various mechanisms in terms of both amplitudes and single differential cross-sections were determined from the data fit. This information is of particular interest for N* studies in coupled channel approaches under development at EBAC [4]. [1] G.V.Fedotov, et. al., Bull. of Russian Academy of Science,71,328 (2007). [2] M.Ripani, et. al., Phys. Rev.,91,0222002 (2003). [3] V.I.Mokeev, et. al., Int. Workshop on the Physics of Excited Baryons (NSTAR05) Tallahassee, Florida, 10-15 Oct 2005, ed by V.Crede, P.Eugenio and S.Capstick, p.47. [4] A.Matsuyama, et.al., Phys.Rep.,439,193 (2007); B.Julia-Diaz, et.al., arXiv:0704.1615.
- Research Organization:
- Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- DOE Contract Number:
- AC05-06OR23177
- OSTI ID:
- 1967362
- Report Number(s):
- JLAB-PHY-07-983; DOE/OR/23177-5941
- Country of Publication:
- United States
- Language:
- English
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