Exclusive charm production in pbar p collisions at s^1/2 <15 GeV

Abstract

We discuss the open charm production in peripheral reactions $\bar{p}p\to {\bar{Y}}_c{Y}_c$ and $\bar{p}p\to M_c{\bar{M}}_c$, where $Y_c$ and $M_c$ stand for ${\Lambda }_c^{+},{\Sigma }_c^{+}$ and $D,D^{\ast }$, respectively, at $\sqrt{s}\lesssim 15$ GeV, which corresponds to the energy range of FAIR. Our consideration is based on the topological decomposition of the planar quark and diquark diagrams which allows to estimate consistently meson and baryon exchange trajectories and energy scale parameters as well. The spin dependence is determined by the effective interaction of lowest exchanged resonance. Unknown parameters are fixed by an independent analysis of open strangeness production in $\bar{p}p\to \bar{Y}Y$ and $\bar{p}p\to \bar{K}K$ reactions and of SU(4) symmetry. We present the corresponding cross sections and longitudinal double-spin asymmetries for exclusive binary reactions with open charm mesons and baryons in the final state. The polarization observables have a non-trivial $t$ and $s$ dependence which is sensitive to details of the open charm production mechanism.

arXiv comment26 pages, 18 figures

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