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Leading-particle effect from heavy-quark recombination.

Eric Braaten1, Yu Jia, Thomas Mehen

  • 1Physics Department, The Ohio State University, Columbus, Ohio 43210, USA.

Physical Review Letters
|September 13, 2002
PubMed
Summary

The leading particle effect enhances charm hadroproduction. Heavy-quark recombination explains the large D(+)/D(-) asymmetry observed in experiments, fitting data with a single parameter.

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Area of Science:

  • High Energy Physics
  • Particle Physics
  • Quantum Chromodynamics

Background:

  • The leading particle effect describes enhanced charm hadroproduction when beam hadrons share partons with the produced charmed hadron (D).
  • The E791 experiment observed a significant asymmetry between D(+) and D(-) production, highlighting this phenomenon.

Purpose of the Study:

  • To investigate the heavy-quark recombination mechanism as an explanation for the leading particle effect in charm hadroproduction.
  • To analyze the D(+)/D(-) asymmetry within the framework of heavy-quark recombination.

Main Methods:

  • Theoretical modeling of heavy-quark recombination.
  • Fitting experimental data, specifically the D(+)/D(-) asymmetry from the E791 experiment.

Main Results:

  • The heavy-quark recombination mechanism provides an economical explanation for the leading particle effect.
  • The model successfully fits the observed D(+)/D(-) asymmetry using a single parameter.

Conclusions:

  • Heavy-quark recombination is a viable mechanism explaining the leading particle effect in charm hadroproduction.
  • The parameter value derived from fitting charm hadroproduction data is consistent with findings from charm photoproduction.

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