Münster 2011 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 58: Hadronenstruktur und -spektroskopie IX

HK 58.6: Talk

Thursday, March 24, 2011, 18:00–18:15, C-2

Primakoff production of π⁰, η and η′ in the Coulomb field of a nucleus — •Murat Kaskulov and Ulrich Mosel — Institut für Theoretische Physik, Universität Giessen, Germany

The Primakoff production of neutral pseudoscalar mesons π⁰,η(587) and η′(958) in the Coulomb field of an atomic nucleus is studied using a model which describes the coherent electromagnetic and nuclear parts of the production amplitude. At high energies the nuclear background is dominated by the exchange of C-parity odd Regge trajectories. In the coherent production the isospin filtering makes the ω(782) a dominant trajectory. We revise the production of pions which has been used to measure the π⁰→γγ decay width at JLAB. The calculations are in agreement with data provided the photon shadowing and final state interactions of mesons are taken into account. The kinematic conditions which allow to study the Primakoff effect in η and η′ photoproduction off nuclei are further discussed.

Supported by DFG through TR16.