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Near Threshold Electroproduction of J / Ψ at 11 GeV May 4 , 2012 the ATHENNA Collaboration

We propose to measure the electroproduction of J/Ψ meson cross section off a proton near threshold (4.05 GeV < W < 4.45 GeV and |t − tmin| < 2.5 GeV2) with an 11 GeV electron beam. The high luminosity JLab 12 GeV upgrade electron beam combined with the large acceptance device SoLID in Hall A allow for a fully exclusive measurement of this process near threshold. The proposed measurement is sensitive to the non-perturbative gluonic interaction between the J/Ψ and nucleon and might reveal an enhancement of the cross section just above threshold. This in turn could be a manifestation of the important role of the conformal anomaly. A further consequence is whether or not J/Ψ-nuclear bound states would exist in nature. Such a measurement would open a new window to study QCD in the nonperturbative regime using charmonium as we contemplate a multi-phase program. Our total requested beam time for the first phase of measurements on proton is 60 days.