Observations of the peculiar A dependence of a production process of symmetric hadron pairs at large P

The effect of decreasing meson pair yields with heavy nuclei is too strong that it can be attributed to revealing the EMC effect. Value α equal to 0.52 for pion pairs at Psub(perpendicular)=2.02 GeV/s corresponds to 5 tipes difference of nucleon yields with Be and Pb nuclei. Observed A-dependence of symmetric hadron pair production only for pairs with proton participation is within the framework of parton model representations while for meson pairs it turns aut to be considerably more complex