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HK: Fachverband Hadronen und Kerne
HK 34: Hadron Structure and Spectroscopy I
HK 34.8: Talk
Tuesday, March 17, 2009, 18:30–18:45, H-ZO 20
Vector-meson dominance from counting rules — •Stefan Leupold1 and Matthias Lutz2 — 1Institut für Theoretische Physik, Universität Giessen, Germany — 2Theory Division, GSI, Darmstadt, Germany
Recently a systematic flavour SU(3) framework has been proposed [1] to describe the
strong and electromagnetic interactions of light pseudoscalar and vector mesons, with
the latter represented by antisymmetric tensor fields. From the corresponding
leading-order Lagrangian one can deduce for which processes vector-meson dominance
applies and for which it does not. In particular, it turned out that at leading order
the hadronic three-body and also the radiative decays of vector mesons are governed
by vector-meson dominance. This allows to predict the hadronic three-body decays, once
the parameters are determined from the radiative decays [2]. The obtained result for
the three-pion decay of the omega meson agrees very well with experiment.
The partial decay widths for the rare three-body decays of the K* are predicted.
Further examples are discussed where the leading-order Lagrangian
does not lead to vector-meson dominance.
Work of S.L. supported by GSI.
[1] M.F.M. Lutz and S. Leupold, Nucl. Phys. A 813 (2008) 96, arXiv:0801.3821 [nucl-th].
[2] S. Leupold and M.F.M. Lutz, arXiv:0807.4686 [hep-ph].