Saime Solmaz

Scalar sigma meson effects in radiative rho0 meson decays

We study the radiative

Scalar

\rho^0\to \pi^+\pi^-\gamma

a_0(980)

and

meson in

\rho^0\to \pi^0\pi^0\gamma

\phi\to \pi^{0}\eta\gamma

decays and we calculate their branching ratios using a phenomenological approach by adding to the amplitude calculated within the framework of chiral perturbation theory and vector meson dominance the amplitude of

decay

\sigma

Scalar a0(980) meson in ϕ → π0ηγ decay

-meson intermediate state. Our results for the branching ratios are in good agreement with the experimental values.

LEP Indications for Two Light Higgs Bosons and U(1) ' Model

We study the radiative decay → π0ηγ within the framework of a phenomenological approach in which the contributions of the ρ meson, chiral loop and a0 meson are considered. We analyse the interference effects between different contributions and utilizing the experimental branching ratio and invariant π0η mass spectrum for the → π0ηγ decay, we estimate the branching ratio of the → a0γ decay.We study the radiative decay

CERN LEP indications for two light higgs bosons and the U(1)' model

\phi\to\pi^{0}\eta\gamma

Different contributions inω→π0ηγandρ→π0ηγdecays

within the framework of a phenomenological approach in which the contributions of