Measurement of pi^0 photoproduction on the proton at MAMI C

Abstract

Differential cross sections for the gamma p -> pi^0 p reaction have been measured with the A2 tagged-photon facilities at the Mainz Microtron, MAMI C, up to the center-of-mass energy W=1.9 GeV. The new results, obtained with a fine energy and angular binning, increase the existing quantity of pi^0 photoproduction data by ~47%. Owing to the unprecedented statistical accuracy and the full angular coverage, the results are sensitive to high partial-wave amplitudes. This is demonstrated by the decomposition of the differential cross sections in terms of Legendre polynomials and by further comparison to model predictions. A new solution of the SAID partial-wave analysis obtained after adding the new data into the fit is presented.

13 pages, 12 figures, 1 table

References in corpus (7)

• Unitary Isobar Model - MAID2007
• Upgrade of the Glasgow photon tagging spectrometer for Mainz MAMI-C
• Study of the gp-->etap reaction with the Crystal Ball detector at the Mainz Microtron(MAMI-C)
• High statistics study of the reaction $\gamma p\to p{\pi }^0\eta$
• First measurement of the helicity asymmetry for $\gamma p\to p{\pi }^0$ in the resonance region
• The N(1520) 3/2- helicity amplitudes from an energy-independent multipole analysis based on new polarization data on photoproduction of neutral pions
• Photoproduction of pi0-mesons off neutrons in the nucleon resonance region

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