The reactions K −p → Y 0 + vector meson at 3.15 and 3.3 GeV/ c and the quark model

Abstract

We present new data on the reactions K − p → Λϱ, Σ oϱ, Λω, Λφ, Σ oφ, Y ∗ϱ and Y ∗φ . All the reactions are characterised by forward-peaked production angular distributions. Fits of the form exp( At′) to the momentum transfer distributions result in values of A ∼ 1 (GeV/ c) −2. We have examined the decay distributions of the vector mesons with respect to an axis normal to the production plane. The data are compared with the quark model predictions for the ϱ/ω, Λ/Σ o and Λ/ Y ∗ ratios. The most serious contradiction is for the Λ/ Σ o ratio, which is experimentally too small.