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The European Physical Journal A

, Volume 40, Issue 1, pp 65–75 | Cite as

Backward pion photoproduction

  • A. Sibirtsev
  • J. Haidenbauer
  • F. Huang
  • S. KrewaldEmail author
  • U. -G. Meißner
Regular Article - Theoretical Physics

Abstract

We present a systematic analysis of backward pion photoproduction for the reactions \( \gamma\) p \( \rightarrow\) \( \pi^{0}_{}\) p and \( \gamma\) p \( \rightarrow\) \( \pi^{+}_{}\) n . Regge phenomenology is applied at invariant collision energies above 3GeV in order to fix the reaction amplitude. A comparision with older data on \( \pi^{0}_{}\) - and \( \pi^{+}_{}\) -photoproduction at \( \vartheta\) = 180° 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 \( \sqrt{{s}}\) \( \le\)2.5 GeV, covered by the new measurements of \( \gamma\) p \( \rightarrow\) \( \pi^{0}_{}\) 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.

PACS

11.55.Jy Regge formalism 13.60.Le Meson production 25.20.Lj Photoproduction reactions 

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Copyright information

© SIF, Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  • A. Sibirtsev
    • 1
    • 2
  • J. Haidenbauer
    • 3
    • 4
  • F. Huang
    • 3
  • S. Krewald
    • 3
    • 4
    Email author
  • U. -G. Meißner
    • 1
    • 3
    • 4
  1. 1.Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical PhysicsUniversität BonnBonnGermany
  2. 2.Excited Baryon Analysis Center (EBAC)Thomas Jefferson National Accelerator FacilityNewport NewsUSA
  3. 3.Institut für Kernphysik and Jülich Centre for Hadron PhysicsForschungszentrum JülichJülichGermany
  4. 4.Institute for Advanced SimulationsForschungszentrum JülichJülichGermany

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