Threshold open charm production in nucleon-nucleon collisions
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The associative charm particles production in nucleon-nucleon collisions $N+N\to Λ_c(Σ_c)+\bar{D}+N$, is described in a general way and the spin and isospin structure of the corresponding matrix elements are derived. Using an analogy with strange particle ($ΛK$)-production, the $D-$meson exchange model is considered in detail. Estimations of the energy behavior of the threshold cross sections show a large dependence on the form of the phenomenological hadron form factors and indicate that, at threshold, the cross section is three order of magnitude smaller than for strange particle production.
11 page, 3 figures
11 page, 3 figures