| Single photo and electroproduction of pions at EBAC@JLAB |
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| 作者姓名： | B. Julia-Diaz |
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| 作者单位： | Excited Baryon Analysis Center (EBAC), Thomas Jefferson National Accelerator Facility, Newport News, Virginia 22901, USA; |
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| 基金项目： | Supported by a CPAN Consolider INGENIO CSD 2007-0042 （FIS2008-1661） （Spain）, by the U.S. Department of Energy, Office of Nuclear Physics Division, （DE-AC02-06CH11357, DE-AC05-06OR23177） under which Jefferson Science Associates operates Jefferson Lab. This work used resources of the National Energy Research Scientific Computing Center which is supported by the Office of Science of the U.S. Department of Energy （DE-AC02-05CH11231） The auther thanks H. Kamano, T.-S. H. Lee, A. Matsuyama, T. Sato and N. Suzuki, for the nice EBA C collaboration. |
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| 摘 要： | Within the Excited Baryon Analysis Center we have performed a dynamical coupled-channels analysis of the 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, π＊N, ηN, and ηN which has π△, pN, and σN components. With the hadronic parameters of the model determined in our previous investigations of πN→ πN reaction, 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 meson cloud effect, as required by the unitarity conditions, on the γ＊N → N＊ form factors are examined.
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| 关 键 词： | 介子云 照片 动力学耦合 模型参数 速效磷 振幅和 螺旋度 统一性 |
| 收稿时间： | 2009-8-7 |
Single photo and electroproduction of pions at EBAC@JLAB |
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| B. Julia-Diaz.Single photo and electroproduction of pions at EBAC@JLAB[J].High Energy Physics and Nuclear Physics,2009,33(12):1296-1301. |
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| Authors: | B Julia-Diaz |
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| Institution: | [1]Department d'Estructura i Constituents de la Mat~ria and Institut de Ciencies del Cosmos, Universitat de Barcelona, E-08028 Barcelona, Spain; [2]Excited Baryon Analysis Center (EBAC), Thomas Jefferson National Accelerator Facility, Newport News, VA 23606, USA |
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| Abstract: | meson electroproduction, helicity amplitudes |
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| Keywords: | meson electroproduction helicity amplitudes |
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