J/ΨN and Psi' N total cross sections from photoproduction data: failure of vector dominance

Abstract

Values for the cross sections $σ^{ΨN}_{tot}$ and $σ^{Ψ' N}_{tot}$ are of crucial importance, once one wants to understand nuclear suppression of $J/Ψ$($Ψ'$) in a search for the quark gluon plasma. Quoted values are usually extracted from $γN \to J/Ψ(Ψ') N$ data via the vector dominance model (VDM) and are very small compared with expectations from QCD. The validity of QCD is questioned. When the VDM is extended to a multi-channel case, the $γN$ data lead to a value $2.8\pm 0.12 mb <σ_{tot}^{ΨN}(\sqrt{s}= 10 GeV) < 4.1\pm 0.15 mb$, which is a factor 3 larger than the VDM prediction. Errors are due to experimental input, and the corridor shows the theoretical uncertainty. We also derive from the data $σ_{tot}^{Ψ' N}/σ_{tot}^{J/ΨN}\approx 4$, where we could not estimate the theoretical uncertainty.