The decay ρ 0 → π + + π − + γ and the coupling constant g ρσγ

ar X iv : h ep - p h / 01 06 21 1 v 1 1 9 Ju n 20 01 Interference effects in the decay φ → π 0 π 0 γ and the coupling constant g

N ov 2 00 4 Study of the D 0 → K + K − π + π − decay

Using data from the FOCUS (E831) experiment at Fermilab, we present a new measurement for the Cabibbo-suppressed decay modeD0 → K+K−π+π−. We measure: Γ(D0 → K+K−π+π−)/Γ(D0 → K−π−π+π+) = 0.0295 ± 0.0011 ± 0.0008 . An amplitude analysis has been performed in order to determine the resonant substructure of this decay mode. The dominant components are the decays D0 → K1(1270) +K−, D0 → K1(1400) +K−...

Study of the D 0 → K + K − π + π − decay

Using data from the FOCUS (E831) experiment at Fermilab, we present a new measurement for the Cabibbo-suppressed decay modeD0 → K+K−π+π−. We measure: Γ(D0 → K+K−π+π−)/Γ(D0 → K−π−π+π+) = 0.0295 ± 0.0011 ± 0.0008 . An amplitude analysis has been performed in order to determine the resonant substructure of this decay mode. The dominant components are the decays D0 → K1(1270) +K−, D0 → K1(1400) +K−...

The decay ρ 0 → π 0 π 0 γ and the role of σ - meson

THE MAPPING CLASS GROUP ACTS REDUCIBLY ON SU(n)-CHARACTER VARIETIES

When G is a connected compact Lie group, and π is a closed surface group, then Hom(π,G)/G contains an open dense Out(π)-invariant subset which is a smooth symplectic manifold. This symplectic structure is Out(π)-invariant and therefore defines an invariant measure μ, which has finite volume. The corresponding unitary representation of Out(π) on L(Hom(π,G)/G, μ) contains no finite-dimensional su...