Open charm enhancement by secondary interactions in relativistic nucleus-nucleus collisions?

Abstract

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 $\pi N\to \bar{D}(\overline{D^{\ast }}){\Lambda }_c,({\Sigma }_c)$. 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.

14 pages, LaTeX, including 5 postscript figures, submitted to Phys. Lett. B

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