Braaten E, Jia Y, Mehen T. Leading-particle effect from heavy-quark recombination.
PHYSICAL REVIEW LETTERS 2002;
89:122002. [PMID:
12225080 DOI:
10.1103/physrevlett.89.122002]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2002] [Indexed: 05/23/2023]
Abstract
The leading particle effect in charm hadroproduction is an enhancement of the cross section for a charmed hadron D in the forward direction of the beam when the beam hadron has a valence parton in common with the D. The large D(+)/D(-) asymmetry observed by the E791 experiment is an example of this phenomenon. We show that the heavy-quark recombination mechanism provides an economical expla-nation for this effect. In particular, the D(+)/D(-) asymmetry can be fit reasonably well using a single parameter whose value is consistent with a recent determination from charm photoproduction.
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