J/Psi and Psi' total cross sections and formation times from data for charmonium suppression in $pA$ collisions

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  • 4 August 1999
Abstract
The recent data for E866 experiment on the x_F dependence for charmonium suppressio` in pA collisions at 800 GeV are analyzed using a time- and energy-dependent preform` charmonium absorption cross section \sigma_{abs}^\psi(\tau,\sqrt{s}). For \sqrt{s}=` the initially (\tau=0) produced premeson has an absorption cross section of \sigma_` At the same energy but for \tau -> \infty one deduces for the total cross sections \sigma_{tot}^{J/Psi N}=(2.8\pm 0.3)mb, \sigma_{tot}^{J/Psi N}=(10.5\pm 3.6)mb. The ` compatible with a formation time \tau_{1/2}=0.6 fm/c.

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