Theory and phenomenology of the η c photo-and electroproduction is developed from the point of view of probing the odderon singularity in QCD which corresponds to the three gluon exchange mechanism. This mechanism leads to the cross-sections which are independent of W 2 for the exchange of three noninteracting gluons or exhibit increase with increasing W 2 (or 1/x) for the odderon intercept above unity. The η c electroproduction in the three gluon exchange mechanism is shown to be entirely controlled by the transversely polarised virtual photons. The magnitude of the η c photoproduction cross-section is estimated to be around 11-45 pb. The t-dependence of the differential cross-section is also discussed.

We calculate the single spin asymmetry in the inclusive pion production in protonproton collisions. We generate the asymmetry at the level of fragmentation function (Collins effect) by the Lund coloured string mechanism. We compare our results with the Fermilab E704 data from p↑p collisions at 200 GeV. We show that the transversely polarized quark densities at high Bjorken x strongly differ from these predicted by the SU(6) proton wave function.

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