Measurement of the Branching Ratios Gamma(D_s*+ -> D_s+ pi0)/Gamma(D_s*+ -> D_s+ gamma) and Gamma(D0+ -> D0 pi0)/Gamma(D0* -> D0 gamma)

TL;DR

This paper reports precise measurements of the ratios of branching fractions for specific D* and D_s* meson decays, providing improved data for understanding isospin-violating processes in charm mesons.

Contribution

The study presents the first high-precision measurements of these branching ratios, significantly refining previous world average values.

Findings

Measured $rac{ ext{Gamma}(D_s^{*+} o D_s^+ ext{pi}^0)}{ ext{Gamma}(D_s^{*+} o D_s^+ ext{gamma})} = 0.062 \

Measured $rac{ ext{Gamma}(D^{*0} o D^0 ext{pi}^0)}{ ext{Gamma}(D^{*0} o D^0 ext{gamma})} = 1.74 \

Both measurements are more precise than previous world averages.

Abstract

Data samples corresponding to the isospin-violating decay $D_s^{*+}\to D_s^+ \pi^0$ and the decays $D_s^{*+}\to D_s^+\gamma$, $D^{*0}\to D^0\pi^0$ and $D^{*0}\to D^0\gamma$ are reconstructed using 90.4 ${\rm fb}^{-1}$ of data recorded by the BaBar detector at the PEP-II asymmetric-energy $e^+e^-$ collider. The following branching ratios are extracted: $\Gamma(D_s^{*+}\to D_s^+ \pi^0)/\Gamma(D_s^{*+}\to D_s^+\gamma) = 0.062\pm0.005 ({\rm stat.})\pm0.006 ({\rm syst.})$ and $\Gamma(D^{*0}\to D^0\pi^0)/\Gamma(D^{*0}\to D^0\gamma) = 1.74\pm0.02 ({\rm stat.})\pm0.13 ({\rm syst.})$. Both measurements represent significant improvements over present world averages.