Electroexcitation of the S11(1535) and D13(1520) up to Q2=4.2 GeV2 from CLAS data

Conference · Mon Oct 01 04:00:00 EDT 2007

OSTI ID:1967413

Aznauryan, Inna ^[1]; Burkert, Volker ^[2]; Mokeev, Viktor ^[3]

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1. Yerevan Physics Institute and Jefferson Lab
2. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
3. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Moscow State University

We present the helicity amplitudes for the electroexcitation of the resonances S11(1535) and D13(1520) on protons extracted from CLAS data on the pi, 2-pi, and eat electroproduction at Q < 1 GeV 2 and from pi+ data at 1.7 < Q2 < 4.2 GeV 2. The analysis of the pi and eta electroproduction data was made using two approaches: dispersion relations and unitary isobar model, which give consistent results. For the first time definite results are obtained for the longitudinal transition amplitudes for these states. Accurate results are also obtained for the transverse transition amplitudes. The results provide stringent tests for existing quark models calculations. None of the models gives a satisfactory description over the entire Q2 range covered by the data.

• 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: 1967413
• Report Number(s): JLAB-PHY-07-985; DOE/OR/23177-5943
• Country of Publication: United States
• Language: English