Recent results on nucleon resonance electrocouplings from the studies of π~+π~-p electroproduction with the CLAS detector

中国物理C, 2009, 33(12): 1210-1215.

^1, , ^2, , ^3, , ^4, , ^5, , ^6,

1.Jefferson Lab,Newport News,12000 Jefferson Ave,VA 23606,USA;Skobeltsyn Nuclear Physics Institute at Moscow State University,Moscow 119899,Russia

2.Jefferson Lab,Newport News,12000 Jefferson Ave,VA 23606,USA

3.Jefferson Lab,Newport News,12000 Jefferson Ave,VA 23606,USA

4.Skobeltsyn Nuclear Physics Institute at Moscow State University,Moscow 119899,Russia

5.Skobeltsyn Nuclear Physics Institute at Moscow State University,Moscow 119899,Russia

6.Skobeltsyn Nuclear Physics Institute at Moscow State University,Moscow 119899,Russia;Physics Department at Moscow State University,Moscow 119899,Russia

基金项目: the Skobeltsyn Nuclear Physics Institute and Physics Department at Moscow State University U.S.Department of Energy and the National Science Foundation Jefferson Science Associates (JSA) operates the Thomas Jefferson National Accelerator Facility for the U.S.Department of Energy(DE-AC05-060R23177)

Recent results on nucleon resonance electrocouplings from the studies of π~+π~-p electroproduction with the CLAS detector

V.I.Mokeev ^1, , V.D.Burkert ^2, , L.Elouadrhiri ^3, , G.V.Fedotov ^4, , E.N.Golovach ^5, , B.S.Ishkhanov ^6,

1.Jefferson Lab,Newport News,12000 Jefferson Ave,VA 23606,USA;Skobeltsyn Nuclear Physics Institute at Moscow State University,Moscow 119899,Russia

2.Jefferson Lab,Newport News,12000 Jefferson Ave,VA 23606,USA

3.Jefferson Lab,Newport News,12000 Jefferson Ave,VA 23606,USA

4.Skobeltsyn Nuclear Physics Institute at Moscow State University,Moscow 119899,Russia

5.Skobeltsyn Nuclear Physics Institute at Moscow State University,Moscow 119899,Russia

6.Skobeltsyn Nuclear Physics Institute at Moscow State University,Moscow 119899,Russia;Physics Department at Moscow State University,Moscow 119899,Russia

Keywords： nucleon resonances

Recent results on nucleon resonance studies in π~+π~-p electro- production off protons with the CLAS detector are presented. The analysis of CLAS data allowed us to determine all essential contributing mechanisms, providing a credible separation between resonant and non-resonant parts of the cross sections in a wide kinematical area of invariant masses of the final hadronic system 1.3 < W < 1.8 GeV and photon virtualities 0.2 < Q~2 < 1.5 GeV~2. Electrocouplings of several excited proton states with masses less than 1.8 GeV were obtained for the first time from the analysis of π~+π~-p exclusive electroproduction channel.

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