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- Title
Backward pion photoproduction.
- Authors
Sibirtsev, A.; Haidenbauer, J.; Huang, F.; Krewald, S.; Meißner, U.
- 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.
- Subjects
PION production; PION-pion interactions; REGGE trajectories; NUCLEAR particle research; PHENOMENOLOGY; MESONS
- Publication
European Physical Journal A -- Hadrons & Nuclei, 2009, Vol 40, Issue 1, p65
- ISSN
1434-6001
- Publication type
Article
- DOI
10.1140/epja/i2008-10743-x