Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-03-07
Phys.Lett. B513 (2001) 1-8
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, LaTeX, including 5 postscript figures, submitted to Phys. Lett. B
Scientific paper
10.1016/S0370-2693(01)00744-4
We calculate open charm production in $Pb+Pb$ reactions at SPS energies within the HSD transport approach - which is based on string, quark, diquark ($q, \bar{q}, qq, \bar{q}\bar{q}$) and hadronic degrees of freedom - including the production of open charm pairs from secondary 'meson'-'baryon' (or quark-diquark and antiquark-diquark) collisions. It is argued that at collision energies close to the $c\bar{c}$ pair threshold the dominant production mechanism is related to the two body (or quasi two body) reactions $\pi N \to \bar{D} (\bar{D^*}) \Lambda_c, (\Sigma_c)$. Estimates within the framework of the Quark-Gluon String model suggest cross sections of a few $\mu b$ for $\pi N \to \bar{D} \Lambda_c$ in the region of 1 GeV above threshold. The dynamical transport calculations for $Pb + Pb$ at 160 A$\cdot$GeV indicate that the open charm enhancement reported by the NA50 Collaboration might be due to such secondary reaction mechanisms.
Cassing Wolfgang
Kondratyuk L. A.
Lykasov Gennadi I.
Rzjanin M. V.
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