On the extraction of cross sections for π0 and η photoproduction off neutrons from deuteron data


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We discuss the procedure of extracting the photoproduction cross section for neutral pseudoscalar mesons off neutrons from deuteron data. The main statement is that the final-state-interaction corrections for the proton and neutron target are in general not equal, but for π0 production there are special cases where they have to be identical and there are large regions in the parameter space of incident photon energy and pion polar angle, Θ*, where they happen to be quite similar. The corrections for both target nucleons are practically identical for π0 production in the energy range of the Δ(1232)3/2+ resonance due to the specific isospin structure of this excitation. Also above the Δ-isobar range large differences between proton and neutron correction factors are only predicted for extreme forward angles (Θ* *lt; 20°), but the results are similar for larger angles. The case of η photoproduction is also briefly considered. Numerical results for the γp → π0p and γn → π0n correction factors are discussed. Also the model description for the available data on the differential γd → π0pn cross sections are given.

作者简介

V. Tarasov

Institute of Theoretical and Experimental Physics

Email: igor@gwu.edu
俄罗斯联邦, Moscow

W. Briscoe

The George Washington University

Email: igor@gwu.edu
美国, Washington

M. Dieterle

Department of Physics

Email: igor@gwu.edu
瑞士, Basel

B. Krusche

Department of Physics

Email: igor@gwu.edu
瑞士, Basel

A. Kudryavtsev

Institute of Theoretical and Experimental Physics; The George Washington University

Email: igor@gwu.edu
俄罗斯联邦, Moscow; Washington

M. Ostrick

Institut für Kernphysik

Email: igor@gwu.edu
德国, Mainz

I. Strakovsky

The George Washington University

编辑信件的主要联系方式.
Email: igor@gwu.edu
美国, Washington

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