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Measurement of the D*(2010)+ meson width and the D*(2010)+ - D0 mass difference
J P Lees1, V Poireau, V Tisserand
1Laboratoire d'Annecy-le-Vieux de Physique des Particules (LAPP), Université de Savoie, CNRS/IN2P3, F-74941 Annecy-Le-Vieux, France.
Physical Review Letters
|October 1, 2013
Summary
This study precisely measured the mass difference and natural linewidth of the D*(2010)+ meson transition to D0 and a pion. The results offer significant improvements in precision over previous measurements.
Area of Science:
- Particle Physics
- Hadron Spectroscopy
Background:
- The D*(2010)+ meson is a crucial element in understanding heavy quark dynamics.
- Precise measurements of its properties, like mass difference and linewidth, are essential for refining theoretical models.
Purpose of the Study:
- To accurately determine the mass difference (Δm0) between the D*(2010)+ and D0 mesons.
- To measure the natural linewidth (Γ) of the D*(2010)+ → D0π+ transition.
Main Methods:
- Utilized data from the BABAR detector at Υ(4S) resonance with an integrated luminosity of 477 fb⁻¹.
- Reconstructed the D0 meson in decay modes D0 → K⁻π+ and D0 → K⁻π+π⁻π+.
Main Results:
- Measured the natural linewidth Γ = (83.3 ± 1.2 ± 1.4) keV.
- Determined the mass difference Δm0 = (145425.9 ± 0.4 ± 1.7) keV.
- Achieved approximately 12x and 6x improvement in precision for linewidth and mass difference, respectively.
Conclusions:
- The study provides highly precise measurements of D*(2010)+ meson properties.
- These refined values will significantly aid in testing and advancing theoretical frameworks in particle physics.
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