Hadronic and radiative $D^*$ decays

TL;DR

This paper compares recent measurements of the $D^{*+}$ meson width with theoretical predictions based on the single-quark-transition hypothesis, updating the predictions with new data and confirming their consistency.

Contribution

It updates the theoretical predictions of $D^{*+}$ and $D_2(2460)$ widths using recent experimental data and verifies their agreement with measurements.

Findings

Measured $D^{*+}$ width is close to updated predictions.

Updated predictions for $D^{*+}$ and $D_2(2460)$ widths agree with experimental data.

Small uncertainties are associated with radiative branching fractions.

Abstract

A recent measurement of the total $D^{*+}$ width, $\Gamma_{\rm tot}(D^{*+}) = (83.3 \pm 1.3 \pm 1.4)$ 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 $D^{*0}$ and $D^{*+}$. A prediction for the total width of $D_2(2460)$ and its partial width into $D^* \pi$ and $D \pi$ is also updated, and found to be in agreement with experiment.