BINARY REACTIONS IN (P)OVER-BAR-P COLLISIONS AT INTERMEDIATE ENERGIES

We discuss here the binary reactions of strange and charmed particle p roduction in pBARp collisions at intermediate energies. In the case of baryon production with only one strange or charmed quark the cross se ction is determined by planar diagrams with K, K** or D*, D**-meson p oles in the t-channel. We calculated these diagrams in the frame of qu ark-gluon string model (QGSM) proposed earlier. We obtained also the c ross-sections for reactions with baryon exchange in the t-channel with KKBAR and DDBAR pair in the final state. Predicted cross-sections for the reactions of LAMBDABAR(c)LAMBDA(c) production are of the order of hundred nanobarns. Using reggeon calculus we estimated cross-sections of binary reactions with two or three strange quarks in the final sta te: pBARp-->XIXIBAR, OMEGAOMEGABAR and phiphi. We discuss also the pos sible manifestation of color transparency effects in reactions with an tiprotons on nuclei where all antiproton quarks annihilate.