Backward pion photoproduction

Details Backward pion photoproduction Backward pion photoproduction

2009-03-03

arxiv.org/abs/0903.0535v1

Eur.Phys.J.A40:65-75,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 17 figures; accepted for publication by Eur. Phys. J. A

Scientific paper

10.1140/epja/i2008-10743-x

We present a systematic analysis of backward pion photoproduction for the reactions gamma p -> pi0 p and gamma p -> pi+ n. Regge phenomenology is applied at invariant collision energies above 3 GeV in order to fix the reaction amplitude. A comparision with older data on pi0- and pi+ photoproduction at theta = 180 degrees indicates that the high-energy limit as given by the Regge calculation could be reached possibly at energies of around sqrt{s} = 3 GeV. In the energy region of sqrt{s} < 2.5 GeV, covered by the new measurements of gamma p -> pi0 p differential cross sections at large angles at ELSA, JLab, and LEPS, we see no clear signal for a convergence towards the Regge results. The baryon trajectories obtained in our analysis are in good agreement with those given by the spectrum of excited baryons.

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