Charmed Hadron Asymmetries in the Intrinsic Charm Coalescence Model

Abstract

Fermilab experiment E791, measuring charmed hadron production in ${\pi }^{-}A$ interactions at 500 GeV with high statistics, has observed a strong asymmetry between the hadroproduction cross sections for leading $D$ mesons which contain projectile valence quarks and the nonleading charmed mesons without projectile valence quarks. Such correlations of the charge of the $D$ meson with the quantum numbers of the beam hadron explicitly contradict the factorization theorem in perturbative QCD which predicts that heavy quarks hadronize through a jet fragmentation function that is independent of the initial state. The E791 experiment also measures ${\Lambda }_c/{\bar{\Lambda }}_c$ and $D_s/\overline{D_s}$ production asymmetries as well as asymmetries in $D\bar{D}$ pair production. We examine these asymmetries and the fractional longitudinal momentum, $x_F$, distributions for single and pairs of charmed hadrons within a two-component model combining leading-twist $gg$ and $q\bar{q}$ fusion subprocesses with charm production from intrinsic heavy quark Fock states. A key feature of this analysis is intrinsic charm coalescence, the process by which a charmed quark in the projectile's Fock state wavefunction forms charmed hadrons by combining with valence quarks of similar rapidities.

arXiv commentLaTex 33 pages, 7 figures. To obtain a copy, send e-mail to [email protected]

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