Direct Measurements of Absolute Branching Fractions for D0 and D+ Inclusive Semimuonic Decays

TL;DR

This paper reports direct measurements of the inclusive semimuonic decay branching fractions for D0 and D+ mesons using BES-II data, providing key insights into charm meson decay properties.

Contribution

First direct measurement of D0 and D+ inclusive semimuonic branching fractions at around 3.773 GeV with BES-II data.

Findings

BF(D0 → μ+ X) = (6.8 ± 1.5 ± 0.7)%

BF(D+ → μ+ X) = (17.6 ± 2.7 ± 1.8)%

Ratio BF(D+)/BF(D0) = 2.59 ± 0.70 ± 0.25

Abstract

By analyzing about 33 $\rm pb^{-1}$ data sample collected at and around 3.773 GeV with the BES-II detector at the BEPC collider, we directly measure the branching fractions for the neutral and charged $D$ inclusive semimuonic decays to be $BF(D^0 \to \mu^+ X) =(6.8\pm 1.5\pm 0.7)%$ and $BF(D^+ \to \mu^+ X) =(17.6 \pm 2.7 \pm 1.8)%$, and determine the ratio of the two branching fractions to be $\frac{BF(D^+ \to \mu^+ X)}{BF(D^0 \to \mu^+ X)}=2.59\pm 0.70 \pm 0.25$.