Measurement of the Beam Asymmetry $\Sigma$ in the Forward Direction for pi0 Photoproduction

Abstract

Photoproduction of neutral pions has been studied with the CBELSA/TAPS detector for photon energies between 0.92 and 1.68~GeV at the electron accelerator ELSA. The beam asymmetry~$\Sigma$ has been extracted for $115^{\circ }<{\theta }_{c.m.}<155^{\circ }$ of the ${\pi }^0$~meson and for ${\theta }_{c.m.}<60^{\circ }$. The new beam asymmetry data improve the world database for photon energies above 1.5~GeV and, by covering the very forward region, extend previously published data for the same reaction by our collaboration. The angular dependence of $\Sigma$ shows overall good agreement with the SAID parameterization.

11 pages, 10 figures, published in Phys. Rev. C, included LEPS data and MAID 2007 predictions for comparison with our data

References in corpus (10)

• Unitary Isobar Model - MAID2007
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• Multivariate side-band subtraction using probabilistic event weights
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Cited by in corpus (23)

• Properties of baryon resonances from a multichannel partial wave analysis
• Progress Toward Understanding Baryon Resonances
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• Light Baryon Spectroscopy
• Photoproduction Reactions and Non-Strange Baryon Spectroscopy
• Relevance of complex branch points for partial wave analysis
• Beam asymmetry for pi+ and pi0 photoproduction on the proton for photon energies from 1.102 to 1.862 GeV
• Updated SAID analysis of pion photoproduction data
• P-wave excited baryons from pion- and photo-induced hyperon production
• Nucleon resonances in the fourth resonance region
• Photoproduction of ω Mesons off the Proton
• The N(1520) 3/2- helicity amplitudes from an energy-independent multipole analysis based on new polarization data on photoproduction of neutral pions
• The polarization observables T, P, and H and their impact on $\gamma p\to p{\pi }^0$ multipoles
• Photoproduction of pi0-mesons off neutrons in the nucleon resonance region
• Photoproduction of Neutral Pions off Protons
• First measurement of the polarization observable $E$ and helicity-dependent cross sections in single ${\pi }^0$ photoproduction from quasi-free nucleons
• Neutral pion photoproduction on the nucleon in a chiral quark model
• Photoproduction of {\boldmath{${\pi }^0$}} Mesons off Protons and Neutrons in the Second and Third Nucleon Resonance Region
• Moravcsik's theorem on complete sets of polarization observables reexamined
• Differential cross section and photon-beam asymmetry for the gamma p -> pi- Delta++(1232) reaction at forward pi- angles for Egamma=1.5-2.95 GeV
• Single-energy partial wave analysis for pion photoproduction with fixed-t analyticity
• Vertex operators for production of baryon resonances in nucleon-gamma collisions with preserving gauge invariance and analyticity
• New graphical criterion for the selection of complete sets of polarization observables and its application to single-meson photoproduction as well as electroproduction