Hadronic and radiative $D^{\ast }$ decays

Abstract

A recent measurement of the total $D^{\ast +}$ width, ${\Gamma }_{\mathrm{tot}}(D^{\ast +})=(83.3\pm 1.3\pm 1.4)$ keV, is shown to be close to earlier predictions based on the single-quark-transition hypothesis. Those predictions are updated using more recent masses and branching fractions to a value of 80.4 keV, with a small uncertainty associated with the radiative branching fractions of $D^{\ast 0}$ and $D^{\ast +}$. A prediction for the total width of $D_2(2460)$ and its partial width into $D^{\ast }\pi$ and $D\pi$ is also updated, and found to be in agreement with experiment.

Comments: 6 pages, 2 figures, submitted to Phys. Rev. D. Reference to new data added; typo corrected; added text above Eq. (3); two references added