Backward pion photoproduction

Abstract

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.

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

References in corpus (5)

• ${\pi }^0$ photoproduction on the proton for photon energies from 0.675 to 2.875 GeV
• Photoproduction of pi0-mesons off protons from the Delta(1232) region to E(gamma) = 3 GeV
• Backward-angle photoproduction of ${\pi }^0$ mesons on the proton at $E_{\gamma }$ = 1.5--2.4 GeV
• Regge approach to charged-pion photoproduction at invariant energies above 2 GeV
• Pion-nucleon charge-exchange amplitudes above 2 GeV

Cited by in corpus (11)

• Baryon spectroscopy
• Photocouplings at the Pole from Pion Photoproduction
• Discovery potential of hidden charm baryon resonances via photoproduction
• Pion- and photo-induced transition amplitudes to $\Lambda K$, $\Sigma K$, and $N\eta$
• P-wave excited baryons from pion- and photo-induced hyperon production
• Model Selection for Pion Photoproduction
• $\eta$ production off the proton in a Regge-plus-chiral quark approach
• Proton-proton scattering above 3 GeV/c
• Backward pion-nucleon scattering
• Analysis of recent eta photoproduction data
• Analysis of the data for $\gamma p\to f_1(1285)p$ photoproduction