Baryon Resonance Analysis from MAID

Details Baryon Resonance Analysis from MAID Baryon Resonance Analysis from MAID

2009-09-12

arxiv.org/abs/0909.2335v1

Physics

Nuclear Physics

Nuclear Theory

8 pages, 11 figures, 4 tables, Proc. of NSTAR2009, Beijing

Scientific paper

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-Q^2 and Q^2 dependent 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 pi- data on the neutron, also Q^2 dependent 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 S11 and D13 resonances.

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