Measurement of the D*(2010)⁺ Natural Linewidth and the D*(2010)⁺—D⁰ Mass Difference

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Abstract

We measure the mass difference, Δm₀, between the D (2010)⁺ and the D⁰ and the natural linewidth, Γ, of the transition D(2010)⁺ → D⁰π⁺. 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⁻¹. The D⁰ is reconstructed in the decay modes D⁰ → K⁻ π⁺ and D⁰ → K⁻ π⁺ π⁻ π⁺. For the decay mode D⁰ → K⁻ π⁺ we obtain Γ = (83.4 ± 1.7 ± 1.5) keV and Δm₀ = (145425.6 ± 0.6 ± 1.8) keV, where the quoted errors are statistical and systematic, respectively. For the D⁰ → K⁻ π⁺ π⁻ π⁺ mode we obtain Γ = (83.2 ± 1.5 ± 2.6) keV and Δm₀ = (145426.6 ± 0.5 ± 2.0) keV. The combined measurements yield Γ = (83.3 ± 1.2 ± 1.4) keV and Δm₀ = (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.

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Keywords

Gigaelectronvolts (GeV), Azimuthal angle, Resolution functions, Resolution bandwidth, D0 experiment

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Rights

CC BY 3.0 (Attribution), ©2014 CERN, for the ATLAS Collaboration

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