Dubravko Klabucar

eta and eta-prime in a coupled Schwinger-Dyson and Bethe-Salpeter approach

Extending our earlier treatments of π0,ηc, and ηb, we study the η−η′ system and its γγ decays using a model which is a leading version of t

η and η ′ mesons in the Dyson-Schwinger approach at finite temperature

We study the temperature dependence of the pseudoscalar meson properties in a relativistic bound-state approach exhibiting the chiral behavior mandated by QCD. Concretely, we adopt the Dyson-Schwinger approach with a rank-2 separable model interaction. After extending the model to the strange sector and fixing its parameters at zero temperature, T=0, we study the T-dependence of the masses and decay constants of all ground-state mesons in the pseudoscalar nonet. Of chief interest are

Two-photon processes of pseudoscalar mesons in a Bethe-Salpeter approach

\eta

Anomalous γ→3π amplitude in a bound-state approach

and

γ★γ→π0 transition and asymptotics of γ★γ and γ★γ★ transitions of unflavored pseudoscalar mesons

\eta^\prime

Application of Jain and Munczek's bound state approach to gamma gamma processes of Pi0, eta(c) and eta(b)

. The influence of the QCD axial anomaly on them is successfully obtained through the Witten-Veneziano relation at T=0. The same approach is then extended to T>0, using lattice QCD results for the topological susceptibility. The most conspicuous finding is an increase of the

Pseudoscalar Meson Nonet at Zero and Finite Temperature

\eta^\prime

Schwinger-Dyson Approach to Light Pseudoscalars

mass around the chiral restoration temperature

Quark off-shell contributions to KL → γγ in a bound-state approach

T_{; ; ; ; \rm Ch}; ; ; ;

Pseudoscalar qq mesons and effective QCD coupling enhanced by condensate

, which would suggest a suppression of