Measurement of branching fraction of $D^{*+}_s\to D^+_s \pi^0$ relative to $D^{*+}_s\to D^+_s \gamma$

TL;DR

This paper reports a precise measurement of the branching fraction of the decay $D^{*+}_s o D^+_s \pi^0$ relative to $D^{*+}_s o D^+_s \\gamma$ using BESIII data, and derives individual branching fractions for these decays.

Contribution

The study provides the first precise measurement of the relative branching fraction of $D^{*+}_s$ decays, improving understanding of charm-strange meson decay dynamics.

Findings

Measured the relative branching fraction as (6.16 ± 0.43 ± 0.19)%

Determined the absolute branching fractions as (93.57 ± 0.44 ± 0.19)% for $D^{*+}_s \\gamma$ and (5.76 ± 0.44 ± 0.19)% for $D^{*+}_s \\pi^0$

Results are consistent with theoretical predictions and previous measurements.

Abstract

Based on 7.33 fb$^{-1}$ of $e^+e^-$ collision data taken at center-of-mass energies between 4.128 and 4.226 GeV with the BESIII detector, we measure the branching fraction of $D^{*+}_s\to D^+_s\pi^0$ relative to that of $D^{*+}_s\to D^+_s\gamma$ to be $(6.16\pm 0.43\pm 0.19)\%$. The first uncertainty is statistical and the second one is systematic. By using the world average value of the branching fraction of $D^{*+}_s\to D^+_se^+e^-$, we determine the branching fractions of $D^{*+}_s\to D^+_s\gamma$ and $D^{*+}_s\to D^+_s\pi^0$ to be $(93.57\pm0.44\pm0.19)\%$ and $(5.76\pm0.44\pm0.19)\%$, respectively.