Pion electro-production in the Roper region in chiral quark models

Details Pion electro-production in the Roper region in chiral quark models Pion electro-production in the Roper region in chiral quark models

2009-06-11

arxiv.org/abs/0906.2066v2

Eur.Phys.J.A42:185-193,2009

Physics

Nuclear Physics

Nuclear Theory

8 pages, 10 Postscript figures, Fig. 7 and Fig. 8 changed

Scientific paper

10.1140/epja/i2009-10878-2

We present a method to calculate pion electro-production amplitudes in a coupled-channel framework incorporating quasi-bound quark-model states. The method offers a clear prescription how to extract the resonant part of the amplitudes, even in the presence of different decay channels and a strong mixing of neighbouring resonances. The method is applied to the calculation of the M1- and the S1- amplitudes in the P11 partial wave in a simple chiral quark model. A good agreement with the observed M1- amplitude is found with a significant contribution from the pion cloud. The same effect is also prominent in the S1- amplitude but a rather uncertain data prevent us to draw a definitive conclusion.

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