Charm-anticharm asymmetries in photoproduction from heavy-quark recombination

Journal Article

The asymmetries between charm and anticharm mesons observed in fixed-target photoproduction experiments are an order of magnitude larger than the asymmetries predicted by conventional perturbative QCD. We show that these charm meson asymmetries can be explained by a heavy-quark recombination mechanism for heavy meson production. In this process, a charm quark combines with a light antiquark from the hardscattering process and they subsequently hadronize into a state including the charm meson. This recombination mechanism can be calculated within perturbative QCD up to some nonperturbative constants. After using symmetries of QCD to reduce the number of free parameters to two, we obtain a good fit to all the data on the asymmetries for charmed mesons from the E687 and E691 experiments.

Duke Authors

Cited Authors

  • Braaten, E; Jia, Y; Mehen, T

Published Date

  • 2002

Published In

Volume / Issue

  • 66 / 1 II

Start / End Page

  • 140031 - 1400310

International Standard Serial Number (ISSN)

  • 0556-2821