R. Escribano

Mixing of η-η′ mesons in Jψ decays into a vector and a pseudoscalar meson

Abstract The octet-singlet mixing angle θP in the pseudoscalar meson nonet is deduced from the rich set of accurate data on J ψ decays into a vector and a pseudoscalar meson. Corrections due to non-ideal ω-φ mixing have been included for the first time and turn out to be crucial to find θP = −16.9° ± 1.7°, which is appreciably less negative than previous results coming from similar analyses.

On the mass, width and coupling constants of the f(0)(980)

Abstract. Using the pole approach we determine the mass and width of the f0(980); in particular, we analyze the possibility that two nearby poles are associated to it. We restrict our analysis to a neighborhood of the resonance, using

The \(\eta \) transition form factor from space- and time-like experimental data

\pi\pi

Scalar σ meson effects in ρ and ω decays into π0π0γ

data for the phase shift and inelasticity, and the invariant mass spectrum of the

Scalar f 0 (980) and \(\sigma (500)\) meson exchange in \(\phi\) decays into \(\pi^0\pi^0\gamma\)

J/\psi\rightarrow\phi\pi\pi, \phi K\bar K

New bounds on the magnetic and electric moments of the tau lepton

decays. The formalism we use is based on unitarity and a generalized ver sion of the Breit-Wigner parameterization. We find that a single pole describes the f0(980), the precise position depending upon the

Radiative VPγ transitions and η–η′ mixing

\pi\pi

The ratio Φ→K+K−/K0K̄0

data used. As a byproduct, values for the

Chiral loops and a0(980) exchange in φ→π0ηγ

g_{f_0\pi\pi}

The orthopositronium decay puzzle and primordial nucleosynthesis

and