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Charmed-meson decay constants in three-flavor lattice QCD
1Physics Department, Columbia University, New York, New York 10027, USA.
Physical Review Letters
|October 4, 2005
Summary
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.
- 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.