Measurement of pi⁰ photoproduction on the proton at MAMI C

2015/06/30 by P. Adlarson, F. Afzal, C. S. Akondi +88 · 1 citation
Physics and Astronomy · #hep-ex #nucl-ex

paper · pdf · doi:10.1103/physrevc.92.024617

published as Phys. Rev. C 92, 024617 (2015) · 13 pages, 12 figures, 1 table

arxiv created 2015/08/20 · arxiv updated 2015/09/02

Abstract

Differential cross sections for the gamma p -> pi⁰ 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 pi⁰ 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.

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