Leading Charm in Hadron-Nucleus Interactions in the Intrinsic Charm Model

Abstract

Leading charm hadrons produced in hadron-nucleus interactions cannot be adequately described within the parton fusion model. Recent results on charm baryon production in ${\Sigma }^{-}A$ interactions at 330 GeV with the WA89 detector disagree with fusion predictions. Intrinsic heavy quark pairs in the ${\Sigma }^{-}(dds)$ wavefunction provide a simple mechanism for producing fast charm hadrons. We calculate leading charm baryon production from ${\Sigma }^{-}$, ${\pi }^{-}$ and $p$ projectiles in a two component model combining parton fusion with intrinsic charm. Final state $D^{-}$, ${\Sigma }_c^0$, ${\Xi }_c^{+}$, and ${\Lambda }_c^{+}$ $d\sigma /d{x}_F$ distributions and $D^{-}/D^{+}$, $D_s^{-}/D_s^{+}$ and ${\Lambda }_c^{+}/{\bar{\Lambda }}_c^{+}$ asymmetries are compared to WA89 data. Predictions are made for 650 GeV ${\Sigma }^{-}A$ and ${\pi }^{-}A$ interactions in the SELEX detector at Fermilab and for 800 GeV $pA$ interactions.

arXiv comment33 pages LaTeX, 10 .eps figures

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