Pion photoproduction on the nucleon in the quark model

Details Pion photoproduction on the nucleon in the quark model Pion photoproduction on the nucleon in the quark model

2002-02-21

arxiv.org/abs/nucl-th/0202067v2

Phys.Rev. C65 (2002) 065204

Physics

Nuclear Physics

Nuclear Theory

Revtex, 35 pages, 16 eps figures; version to appear on PRC

Scientific paper

10.1103/PhysRevC.65.065204

We present a detailed quark-model study of pion photoproduction within the effective Lagrangian approach. Cross sections and single-polarization observables are investigated for the four charge channels, $\gamma p\to \pi^+ n$, $\gamma n\to \pi^- p$, $\gamma p\to \pi^0 p$, and $\gamma n\to \pi^0 n$. Leaving the $\pi N\Delta$ coupling strength to be a free parameter, we obtain a reasonably consistent description of these four channels from threshold to the first resonance region. Within this effective Lagrangian approach, strongly constrainted by the quark model, we consider the issue of double-counting which may occur if additional {\it t}-channel contributions are included.

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