Measurement of the absolute branching fraction of inclusive semielectronic $D_s^{+}$ decays

Abstract

We measure the inclusive semielectronic decay branching fraction of the $D_s^{+}$ meson. A double-tag technique is applied to $e^{+}{e}^{-}$ annihilation data collected by the BESIII experiment at the BEPCII collider, operating in the center-of-mass energy range $4.178-4.230$ GeV. We select positrons from $D_s^{+}\to X{e}^{+}{\nu }_e$ with momenta greater than 200 MeV/$c$, and determine the laboratory momentum spectrum, accounting for the effects of detector efficiency and resolution. The total positron yield and semielectronic branching fraction are determined by extrapolating this spectrum below the momentum cutoff. We measure the $D_s^{+}$ semielectronic branching fraction to be $\mathcal{B}\left(D_s^{+}\to X{e}^{+}{\nu }_e\right)=\left(6.30\pm 0.13(\text{stat.})\pm 0.10(\text{syst.})\right)\%$, showing no evidence for unobserved exclusive semielectronic modes. We combine this result with external data taken from literature to determine the ratio of the $D_s^{+}$ and $D^0$ semielectronic widths, $\frac{\Gamma (D_s^{+}\to X{e}^{+}{\nu }_e)}{\Gamma (D^0\to X{e}^{+}{\nu }_e)}=0.790\pm 0.016(\text{stat.})\pm 0.020(\text{syst.})$. Our results are consistent with and more precise than previous measurements.

arXiv comment62 pages in total, 9 figures, 8 tables, to be submitted to Phys. Rev. D

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Cited by in corpus (8)

• Revisiting Inclusive Decay Widths of Charmed Mesons
• Measurement of the Absolute Branching Fraction of $D_s^{+}\to {\tau }^{+}{\nu }_{\tau }$ via ${\tau }^{+}\to e^{+}{\nu }_e{\bar{\nu }}_{\tau }$
• Improved measurement of the absolute branching fraction of inclusive semileptonic ${\Lambda }_c^{+}$ decay
• Measurement of the absolute branching fraction of the inclusive decay $D_s^{+}\to {\pi }^{+}{\pi }^{+}{\pi }^{-}X$
• Search for the Rare Decays $D_s^{+}\to h^{+}(h^0)e^{+}{e}^{-}$
• Determination of Strong Coupling Constant from Inclusive Semileptonic Decays of Charmed Mesons
• Theory Motivation: What measurements are needed?
• ${\eta }^{(\prime )}$-meson twist-2 distribution amplitude within QCD sum rule approach and its application to the semi-leptonic decay $D_s^{+}\to {\eta }^{(\prime )}{\ell }^{+}{\nu }_{\ell }$