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Exclusive charm production in pbar p collisions at s^12 15 GeV
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Exclusive charm production in p?p collisions at
√
s . 15GeV
A.I. Titova,b and B. Ka?mpfera,c
aForschungzentrum Dresden-Rossendorf, 01314 Dresden, Germany
bBogoliubov Laboratory of Theoretical Physics, JINR, Dubna 141980, Russia
c Institut fu?r Theoretische Physik, TU Dresden, 01062 Dresden, Germany
Abstract
We discuss the open charm production in peripheral reactions p?p → Y?cYc and p?p → McM?c,
where Yc and Mc stand for Λ
+
c ,Σ
+
c and D,D
?, respectively, at
√
s . 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 dependance is determined
by the effective interaction of lowest exchanged resonance. Unknown parameters are fixed by an
independent analysis of open strangeness production in p?p → Y? Y and p?p → 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.
PACS numbers: 12.38Bx, 13.85Ni, 13.88.+e
1
I. INTRODUCTION
Open charm production will be one of the major topics of the hadron and heavy-ion
programme at FAIR [1]. On the one hand, charm spectroscopy will be addressed by the
PANDA collaboration [2], while the CBM collaboration [3] will exploit charmed particles as
probes of the nuclear medium at maximum compression. For both large-scale experiments
at FAIR one needs to know the properties of charmed baryons and mesons as well as their
production processes in elementary pp and p?p reactions. For this the opportunities at FAIR
are promising, as for instance, the PAX collaborati
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