Backward pion photoproduction
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.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-06OR23177
- OSTI ID:
- 979631
- Report Number(s):
- JLAB-THY-09-959; DOE/OR/23177-0676; TRN: US1003240
- Journal Information:
- European Physical Journal A, Vol. 40, Issue 1
- Country of Publication:
- United States
- Language:
- English
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