Measurement of the D[superscript *](2010)[superscript +] Meson Width and the D[superscript *](2010)[superscript +]-D[superscript 0] Mass Difference

• Main Authors: Cowan, Ray Franklin (Contributor), Dujmic, D. (Contributor), Sciolla, Gabriella (Contributor)
• Other Authors: Massachusetts Institute of Technology. Laboratory for Nuclear Science (Contributor)
• Format: Article
• Language: English
• Published: American Physical Society, 2013-10-15T17:30:11Z.
• Subjects: Article
• Online Access: Get fulltext

We measure the mass difference Δm0 between the D[superscript *](2010)[superscript +] and the D[superscript 0] and the natural linewidth Γ of the transition D[superscript *](2010)[superscript +]→D[superscript 0]π[superscript +]. The data were recorded with the BABAR detector at center-of-mass energies at and near the Υ(4S) resonance, and correspond to an integrated luminosity of approximately 477  fb[superscript -1]. The D[superscript 0] is reconstructed in the decay modes D[superscript 0]→K[superscript -]π[superscript +] and D[superscript 0]→K[superscript -]π[superscript +]π[superscript -]π[superscript +]. For the decay mode D[superscript 0]→K[superscript -]π[superscript +] we obtain Γ=(83.4±1.7±1.5)  keV and Δm[subscript 0]=(145425.6±0.6±1.8)  keV, where the quoted errors are statistical and systematic, respectively. For the D[superscript 0]→K[superscript -]π[superscript +]π[superscript -]π[superscript +] mode we obtain Γ=(83.2±1.5±2.6)  keV and Δm[subscript 0]=(145426.6±0.5±2.0)  keV. The combined measurements yield Γ=(83.3±1.2±1.4)  keV and Δm[subscript 0]=(145425.9±0.4±1.7)  keV; the width is a factor of approximately 12 times more precise than the previous value, while the mass difference is a factor of approximately 6 times more precise.
United States. Dept. of Energy
National Science Foundation (U.S.)
Alfred P. Sloan Foundation