Münster 2002 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 19: Electromagnetic and Hadronic Probes II

HK 19.6: Talk

Tuesday, March 12, 2002, 18:30–18:45, D

η′ photo- and electroproduction on nucleons — •Eugenio Marco, Bugra Borasoy, and Stefan Wetzel — Physik-Department, Technische Universität München

The S wave contribution to photo- and electroproduction of the η′ meson on both the proton and neutron is investigated within a relativistic chiral unitary approach based on coupled channels. We work with an effective chiral Lagrangian which includes the η′ as an explicit degree of freedom and incorporates important features of the underlying QCD Lagrangian such as the axial U(1) anomaly. Unitarity constraints are imposed in performing the resummation of the amplitudes obtained from chiral perturbation theory and cross sections of η′ photo- and electroproduction from nucleons are obtained. The investigation of the η′-nucleon system may offer new insights into the role of gluons in chiral dynamics.

Work supported in part by the DFG and the Alexander von Humboldt Foundation.