Backward-angle photoproduction of ${\pi }^0$ mesons on the proton at $E_{\gamma }$ = 1.5--2.4 GeV

Abstract

Differential cross sections and photon beam asymmetries for ${\pi }^0$ photoproduction have been measured at $E_{\gamma }$ = 1.5--2.4 GeV and at the ${\pi }^0$ scattering angles, --1 $<$ cos${\Theta }_{c.m.}<$ --0.6. The energy-dependent slope of differential cross sections for $u$-channel ${\pi }^0$ production has been determined. An enhancement at backward angles is found above $E_{\gamma }$ = 2.0 GeV. This is inferred to be due to the $u$-channel contribution and/or resonances. Photon beam asymmetries have been obtained for the first time at backward angles. A strong angular dependence has been found at $E_{\gamma }>$ 2.0 GeV, which may be due to the unknown high-mass resonances.

arXiv comment12 pages, 4 figures, submitted to PLB

References in corpus (15)

• A unitary isobar model for pion photo- and electroproduction on the proton up to 1 GeV
• Quasi-Two-Body Decays of Nonstrange Baryons
• Meson-exchange Model for $\pi N$ scattering and $\gamma N->\pi N$ reaction
• Dynamical coupled-channel model of meson production reactions in the nucleon resonance region
• Analysis of Pion Photoproduction Data
• Dynamical Study of the Delta Excitation in N(e,e' pi) Reactions
• Strange Decays of Nonstrange Baryons
• The gamma + p to K+ + Lambda and gamma + p to K+ + Sigma0 reactions at forward angles with photon energies from 1.5 to 2.4 GeV
• Beam polarization asymmetries for the p(gamma,K+)Lambda and p(gamma,K+)Sigma0 reactions at Egamma=1.5-2.4 GeV
• Decays of Baryon Resonances into K Lambda, K^+ Sigma^0 and K^0 Sigma^+
• Photoproduction of Baryons Decaying into N pi and N eta
• ${\pi }^0$ photoproduction on the proton for photon energies from 0.675 to 2.875 GeV
• Neutral pion photoproduction off protons in the energy range 0.3 GeV < E(gamma) < 3 GeV
• Locality of quark-hadron duality and deviations from quark counting rules above resonance region
• Study of Nucleon Resonances with Double Polarization Observables of Pion Photoproduction

Cited by in corpus (12)

• ${\pi }^{+}$ photoproduction on the proton for photon energies from 0.725 to 2.875 GeV
• Photocouplings at the Pole from Pion Photoproduction
• Light Baryon Spectroscopy
• Photoproduction Reactions and Non-Strange Baryon Spectroscopy
• Beam asymmetry for pi+ and pi0 photoproduction on the proton for photon energies from 1.102 to 1.862 GeV
• Backward-angle photoproduction of eta meson from protons at E_gamma = 1.6 - 2.4 GeV
• Baryon Resonance Analysis from SAID
• Measurement of the Beam Asymmetry $\Sigma$ in the Forward Direction for pi0 Photoproduction
• Photoproduction of Neutral Pions off Protons
• Pion-nucleon charge-exchange amplitudes above 2 GeV
• First measurement of coherent $\varphi$-meson photoproduction from helium-4 near threshold
• Backward pion photoproduction