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HK: Physik der Hadronen und Kerne
HK 23: Theory III
HK 23.5: Vortrag
Mittwoch, 13. März 2002, 12:15–12:30, A
Chiral Dynamics of the η′ — •Niklas Beisert, Bugra Borasoy, and Stefan Wetzel — Physik-Department, Technische Universität München
We investigate chiral dynamics of the η′ at low energies based on a U(3) chiral Lagrangian.
As a first example, the dominant hadronic decay mode of the η′, η′→ η π π, is evaluated up to one-loop order. For the evaluation of loop integrals we employ infrared regularization which makes 1/Nc counting rules redundant. Reasonable agreement with data is obtained without finetuning any parameters.
In the second part of the report, the spectrum of scalar resonances is analysed by non-pertubative means. The chiral effective Lagrangian is combined with a coupled-channel Bethe-Salpeter approach which generates bound state poles of two pseudoscalar mesons. By taking the next-to-leading order Lagrangian into account we observe a number of resonances, including exotics, around 1.5 GeV, some of which can be identified with resonances found in nature.
Work supported in part by the DFG.