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Charmed-meson decay constants in three-flavor lattice QCD.

C Aubin1, C Bernard, C Detar

  • 1Physics Department, Columbia University, New York, New York 10027, USA.

Physical Review Letters
|October 4, 2005
PubMed
Summary

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This study provides the first lattice quantum chromodynamics (QCD) calculation of the D+-meson decay constant (fD+) using realistic sea quark content. The results offer crucial data for understanding meson properties in particle physics.

Area of Science:

  • High Energy Physics
  • Quantum Chromodynamics
  • Hadron Spectroscopy

Background:

  • The D+-meson decay constant (fD+) is a fundamental parameter in particle physics.
  • Previous calculations often simplified the sea quark content, limiting accuracy.
  • Realistic sea quark content is essential for precise theoretical predictions.

Purpose of the Study:

  • To perform the first lattice QCD calculation of fD+ with realistic sea quark content.
  • To provide accurate theoretical values for fD+ and fDs.
  • To contribute to the understanding of meson properties and Standard Model tests.

Main Methods:

  • Utilized the MILC Collaboration's publicly available lattice gauge field ensembles.
  • Employed a quark sea with two light flavors (up and down) and a heavier strange quark.

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  • Performed lattice quantum chromodynamics (QCD) calculations.

    • Main Results:

    • Obtained the D+-meson decay constant f(D+) = 201 ± 3 ± 17 MeV.
    • Calculated the Ds meson decay constant f(Ds) = 249 ± 3 ± 16 MeV.
    • The errors include both statistical and systematic uncertainties.

    Conclusions:

    • This work presents the most accurate lattice QCD determination of fD+ to date with realistic sea quark content.
    • The calculated values provide important benchmarks for theoretical predictions and experimental comparisons.
    • The methodology sets a new standard for future lattice QCD studies of meson properties.