Precise Measurement of Sigma Beam Asymmetry for Positive Pion Photoproduction on the Proton from 800 to 1500 Mev

Abstract

The Sigma beam asymmetry for positive pion photoproduction on the proton has been measured over an angular range of 40-170 deg at photon energies from 0.8 to 1.5 GeV. The resulting data set includes 237 accurate points, 136 of these belonging to an almost unexplored domain above 1.05 GeV. Data of such high precision provide severe constraints for partial wave analyses. The influence of this experiment on the GW multipole analysis is demonstrated. Significant changes are found in multipoles connected to the S31(1620) and P13(1720) resonances. Comparisons using the MAID analysis are also presented.

arXiv comment11 pages, 4 eps figures. to be published in Physics Letters B

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Cited by in corpus (16)

• Unitary Isobar Model - MAID2007
• Baryon spectroscopy
• Progress Toward Understanding Baryon Resonances
• Analysis of Pion Photoproduction Data
• Study of Non-Strange Baryon Resonances with Meson Photoproduction
• Beam polarization asymmetries for the p(gamma,K+)Lambda and p(gamma,K+)Sigma0 reactions at Egamma=1.5-2.4 GeV
• Evidence for a narrow structure at W~1.68 GeV in eta photoproduction on the neutron
• Photocouplings at the Pole from Pion Photoproduction
• Electroexcitation of nucleon resonances at Q^2=0.65 GeV/c^2 from a combined analysis of single- and double-pion electroproduction data
• 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
• Beam asymmetry $\Sigma$ measurements on the ${\pi }^{-}$ photoproduction off neutrons
• Differential cross section and photon beam asymmetry for the gamma p -> pi+ n reaction at forward pi+ angles at Egamma=1.5-2.95 GeV
• Single-energy partial wave analysis for pion photoproduction with fixed-t analyticity
• Effect of double-polarization data in fits to single-pion photoproduction