Chinese Physics C > 2009, Vol. 33 > Issue(12): 1296-1301 DOI: 10.1088/1674-1137/33/12/041

Single photo and electroproduction of pions at

B. Juliá Díaz^,

(Department d'Estructura i Constituents de la Matèria and Institut de Ciències del Cosmos, Universitat de Barcelona, E—08028 Barcelona, Spain)(Excited Baryon Analysis Center (EBAC), Thomas Jefferson National Accelerator Facility, Newport News, VA 23606, USA)

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Abstract：

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, πN, ηN, and ππN which has πΔ, ρN, 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, S₁₁and D₁₃partial waves. The meson cloud effect, as required by the unitarity conditions, on the γ^*N→N^*form factors are examined.

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B. Juliá Díaz. Single photo and electroproduction of pions at[J]. Chinese Physics C, 2009, 33(12): 1296-1301. doi: 10.1088/1674-1137/33/12/041

B. Juliá Díaz. Single photo and electroproduction of pions at[J]. Chinese Physics C, 2009, 33(12): 1296-1301. doi:10.1088/1674-1137/33/12/041 shu

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Received: 2009-08-07
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Single photo and electroproduction of pions at

B. Juliá Díaz^,

Corresponding author:B. Juliá Díaz,

(Department d'Estructura i Constituents de la Matèria and Institut de Ciències del Cosmos, Universitat de Barcelona, E—08028 Barcelona, Spain)(Excited Baryon Analysis Center (EBAC), Thomas Jefferson National Accelerator Facility, Newport News, VA 23606, USA)

Received Date:2009-08-07
Accepted Date:1900-01-01
Available Online:2009-12-05

Abstract:

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, πN, ηN, and ππN which has πΔ, ρN, 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, S₁₁and D₁₃partial waves. The meson cloud effect, as required by the unitarity conditions, on the γ^*N→N^*form factors are examined.