Mixing angles and decay constants of eta, eta-prime and eta(c)

Positivity conditions on the spectral representation of the pseudoscalar densities are used to obtain bounds on the quark vacuum condensate ratio (ss)/(uu). These relate (ss)/(uu) to the topological susceptibility G(0) of the U(1) sector and appear to favour a smaller value for this quantity than is given by the current-algebra result.

Spectral function sum rules and the SU(3) violation of quark condensates in quantum chromodynamics

The mixing of the glueball candidate⇌i(1,460) with η and η′ is studied in a chiral symmetry breaking framework. Using the solutions of anomalous Ward identities for flavourU(3)×U(3), we find that the octet-singlet mixing angle is quite large and that our results are consistent with a large glueball component in⇌i(1,460) with moderate gluonium mixing in η and η′.

Meson-gluonium mixing and the glueball candidate⇌i(1,460)

The anomalous Ward identities are solved in the framework of QCD. An important outcome of this calculation is the possibility of an extremely small width for ι→γγ decay mode.

B. Bagchi

Papers

Solutions of anomalous Ward identities in a QCD framework