uc l - th / 9 50 50 21 v 1 1 6 M ay 1 99 5 NN Annihilation in Large Nc QCD with ρ and ω Mesons

- th / 9 90 50 16 v 1 6 M ay 1 99 9 Dilepton Production from ρ - Mesons in a Quark - Gluon Plasma ∗

Assuming that ρ -mesons exist in a quark-gluon plasma at temperatures close to the QCD phase transition, we calculate the dilepton production rate from q-q̄ annihilation via a ρ -meson state using Vector Meson Dominance. The result is compared to the rates from direct q-q̄ annihilation and from π-π annihilation. Furthermore we discuss the suppression of low mass dileptons if the quarks assume an ...

ar X iv : n uc l - th / 9 90 50 49 v 2 2 6 M ay 1 99 9 η - and η ′ - meson production in the reaction pn → dM near threshold

ar X iv : n uc l - th / 9 90 50 49 v 1 2 1 M ay 1 99 9 η - and η ′ - meson production in the reaction pn → dM near threshold

ar X iv : n uc l - th / 9 31 10 21 v 1 2 3 N ov 1 99 3 Rates for the reactions pp → πφ and γφ

We study pp annihilation at rest into πφ and γφ. and ρ + ρ − for pp → πφ states is sizable, of order (0.90 to 2.6) × 10 −4 in the branching ratio, but smaller than experiment. For pp → γφ the rescattering contributions are negligible, but the γφ channel is well explained by a ρφ intermediate state combined with vector meson dominance.

ar X iv : h ep - p h / 95 04 36 2 v 1 2 1 A pr 1 99 5 Branching Ratios in Proton Antiproton Annihilation at Rest from Large

We use classical or large N c QCD to describe the mesons (π, ρ, ω) coming from proton-antiproton annihilation at rest as classical fields, which we then quantize as coherent states. This treatment gives a nearly parameter free account of the pion branching ratios in annihilation.