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HK: Physik der Hadronen und Kerne
HK 39: Theorie VII
HK 39.6: Vortrag
Mittwoch, 21. März 2001, 17:45–18:00, F
Hadronic decays of the η′ in U(3) chiral perturbation theory — •Niklas Beisert, Bugra Borasoy, and Stefan Wetzel — Physik-Department, Technische Universität München.
The dominant hadronic decay mode of the η′, i.e. η′ →
η
π π, is investigated up to one-loop order in U(3) chiral
perturbation
theory. Within this framework the η′ is included without employing
1/Nc counting rules and loop integrals are evaluated using infrared
regularization which preserves Lorentz and chiral symmetry.
This approach allows for a consistent power counting scheme in the
presence
of the η′ and incorporates important features of the η-η′
system, such as η-η′ mixing. The investigation will lead to
a better understanding of the role of gluons in chiral dynamics
due to the axial U(1) anomaly.
Work supported in part by the DFG.