Production of ω-mesons in proton-proton collisions
نویسندگان
چکیده
The production of ω-mesons in proton-proton collisions for proton incident energies up to 2.2 GeV is investigated within a mesonexchange model of hadronic interactions. We find a large cancellation between the dominant πρω meson-exchange current and nucleonic current contributions. A comparison with preliminary data from SATURNE calls for the inclusion of off-shell form factors at the NNω and πρω production vertices. Due to the present lack of knowledge of these form factors, together with the destructive interference mentioned above, the relative magnitude of the nucleonic and meson-exchange current contributions cannot be determined from existing total cross section data. However, it is shown that the angular distribution of the produced ω-mesons provides an unique and clear signature of the magnitude of these currents, thus allowing one to disentangle these two basic reaction mechanisms.
منابع مشابه
ex / 0 10 70 09 v 2 2 1 Se p 20 01 Production of ω mesons in proton - proton collisions ⋆ The COSY - TOF collaboration
The cross section for the production of ω mesons in proton-proton collisions has been measured in a previously unexplored region of incident energies. Cross sections of σ = (7.5± 1.9)μb and σ = (30.8± 3.4) μb (with 20% systematic uncertainties) were extracted at ǫ = 92 MeV and 173 MeV excess energy above the ω threshold, respectively. The angular distribution of the ω at ǫ = 173 MeV is strongly...
متن کاملar X iv : n uc l - ex / 0 10 70 09 v 1 1 2 Ju l 2 00 1 Production of ω mesons in proton - proton collisions ⋆
The cross section for the production of ω mesons in proton-proton collisions has been measured in a previously unexplored region of incident energies. Cross sections of σ = (7.5± 1.9)μb and σ = (30.8± 3.4) μb (with 20% systematic uncertainties) were extracted at 92 MeV and 173 MeV excess energy, respectively. The angular distribution of the ω at ǫ = 173 MeV is strongly anisotropic, demonstratin...
متن کاملO ct 2 00 3 Exclusive φ production in proton - proton collisions in the resonance model
Exclusive φ production in proton-proton collisions in the resonance model. Abstract The exclusive φ meson production in proton-proton reactions is calculated within the resonance model. The considered model was already successfully applied to the description of π, η, ρ, ω, ππ production in proton-proton collisions. The only new parameter entering into the model is the ω − φ mixing angle θ mix w...
متن کاملThe Qcd Pomeron in Ultraperipheral Heavy Ion Collisions: Iv. Photonuclear Production of Vector Mesons
The photonuclear production of vector mesons in ultraperipheral heavy ion collisions is investigated within the QCD color dipole picture, with particular emphasis on the saturation model. The integrated cross section and the rapidity distribution for the AA → V AA (V = ρ, ω, φ, J/Ψ) process are computed and theoretical estimates for scattering on both light and heavy nuclei are given for energi...
متن کاملStrange and Multi-Strange Particle Production in ALICE
The production of strange and multi-strange hadrons in proton-proton (pp) and lead-lead (Pb-Pb) collisions is studied with the ALICE experiment at the CERN LHC. These particles are reconstructed via their weak decay topologies, exploiting the tracking and particle identification capabilities of ALICE. Measurements of central rapidity yields of Λ, Ξ− and Ω− baryons, their antiparticles and KS me...
متن کامل