Chinese Physics C > 2009, Vol. 33 > Issue(12): 1069-1076 DOI: 10.1088/1674-1137/33/12/005

Baryon resonance analysis from MAID

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Abstract：

The unitary isobar model MAID2007 has been used to analyze the recent data of pion electroproduction. The model contains all four-star resonances in the
region below W=2 GeV and both single-Q²and Q²dependent transition form factors could be obtained for the Delta, Roper, D₁₃(1520), S₁₁(1535), S₃₁(1620), S₁₁(1650), D₁₅(1675), F₁₅(1680) and P₁₃(1720). From the complete world data base, including also π^－data on the neutron, also Q²dependent neutron form factors are obtained. For all transition form factors we also give convenient numerical parameterizations that can be used in other reactions. Furthermore, we show how the transition form factors can be used to obtain empirical transverse charge densities and our first results are given for the Roper, the S₁₁and D₁₃resonances.

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D. Drechsel, S.S. Kamalov and M. Vanderhaeghen. Baryon resonance analysis from MAID[J]. Chinese Physics C, 2009, 33(12): 1069-1076. doi: 10.1088/1674-1137/33/12/005

D. Drechsel, S.S. Kamalov and M. Vanderhaeghen. Baryon resonance analysis from MAID[J]. Chinese Physics C, 2009, 33(12): 1069-1076. doi:10.1088/1674-1137/33/12/005 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

Baryon resonance analysis from MAID

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

Abstract:

The unitary isobar model MAID2007 has been used to analyze the recent data of pion electroproduction. The model contains all four-star resonances in the
region below W=2 GeV and both single-Q²and Q²dependent transition form factors could be obtained for the Delta, Roper, D₁₃(1520), S₁₁(1535), S₃₁(1620), S₁₁(1650), D₁₅(1675), F₁₅(1680) and P₁₃(1720). From the complete world data base, including also π^－data on the neutron, also Q²dependent neutron form factors are obtained. For all transition form factors we also give convenient numerical parameterizations that can be used in other reactions. Furthermore, we show how the transition form factors can be used to obtain empirical transverse charge densities and our first results are given for the Roper, the S₁₁and D₁₃resonances.