We compute the decay constants of the lowest cc¯-states with quantum numbers JPC=
0−+(η c), 1−−(J/ψ), and 1+−(hc) by using lattice QCD and QCD sum rules. We consider the …

Nonrelativistic quark models of charmonia are tested by comparison of theoretical
charmonium decay constants, form factors, and γ γ widths with experiment and lattice gauge …

Two-photon decay rates of pseudoscalar, scalar and tensor states of charmonium and
bottomonium are calculated in the framework of the relativistic quark model. Both relativistic …

In this paper, we calculate the mass spectrum, weak decay constants, two photon decay
widths, and two-gluon decay widths of ground (1 S) and radially excited (2 S, 3 S,…) states …

A new mechanism for the observed inclusive B→ η′ X decay is suggested. We argue that
the dominant contribution to this amplitude is due to the Cabibbo favored b→ c cs process …

In this work, we investigate the spectroscopy and decay rates of charmonia within the
framework of the non-relativistic Schrödinger equation by employing an approximate inter …

We evaluate the two-photon width of the pseudoscalar charmonia, Γ γ γ (η c) and Γ γ γ (η
c′), within a Heavy-Quark Spin-Symmetry setting and show that whereas the former width …

Two-photon and two-gluon annihilation rates of ηc, ηc′, ηb and ηb′ are estimated in the
relativistic Salpeter method. By solving the full Salpeter equation with a well defined …

The ηcγ transition form factor is calculated within a perturbative approach. For the ηc-meson,
a wave function of the Bauer-Stech-Wirbel type is used where the two free parameters …

We study O (α sv 2) corrections to decays of S 0 1 heavy quarkonium into light hadrons and
two photons within the framework of nonrelativistic QCD and find these O (α sv 2) corrections …