Tri-meson-mixing of π\pi-η\eta-η′\eta' and ρ\rho-ω\omega-ϕ\phi in the light-cone quark model

The radiative transition form factors of the pseudoscalar mesons {$\pi$, $\eta$, $\eta'$} and the vector mesons {$\rho$, $\omega$, $\phi$} are restudied with $\pi$-$\eta$-$\eta'$ and $\rho$-$\omega$-$\phi$ in tri-meson-mixing pattern, which is described by tri-mixing matrices in the light-cone constituent quark model. The experimental transition decay widths are better reproduced with tri-meson-mixing than previous results in a two-mixing-angle scenario of only two-meson $\eta$-$\eta'$ mixing and $\omega$-$\phi$ mixing.Comment: 8 pages, 6 figures, final version to appear in EPJ

Energievooruitzichten 2000-2020 : verkennende scenario's voor Belgie

Deze studie verkent de energiescenario's voor Belgie tegen 2020. Het hoofddoel bestaat erin om de voornaamste problemen en onzekerheden te identificeren en te bespreken, waarmee het Belgische energiesysteem de komende twintig jaar geconfronteerd zal worden. Voor elk scenario wordt de overeenkomstige CO2-uitstoot berekend.

Anomalous Ward identities and psi rarr gamma eta ( eta '), psi ' rarr psi pi /sup 0/( eta ) decay rates

Anomalous Ward identities saturated with one-particle pseudoscalar states, together with pi /sup 0/, eta and eta ' rarr 2 gamma decay amplitudes and Gamma ( psi rarr eta ' gamma )/ Gamma ( psi rarr eta gamma ), Gamma ( psi ' rarr psi pi /sup 0 /)/ Gamma ( psi ' rarr psi eta ) branching ratios, provide a set of equations which can be solved for the axial-vector couplings and the topological charge components.Anglai

Costs of a ceiling on Kyoto flexibility

This paper examines the potential costs of a ceiling on the use of flexibility mechanisms in the Kyoto Protocol using POLES, a partial equilibrium model of the world energy systems. The results suggest that if emission trading were restricted to Annex I countries, halving the traded volume would increase costs by US$11 billion per year. If emission trading were to operate at a global level, reducing the trade to half the perfect market volume would increase annual costs by US$12 billion per year. Global carbon emission might, however, be 1% lower. The sensitivity of the results is discussed