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- W4367000403 abstract "Using $7.33~mathrm{fb}^{-1}$ of $e^+e^-$ collision data taken with the BESIII detector at the BEPCII collider, we report the first experimental study of the purely leptonic decay $D_s^{*+}to e^+nu_e$. A signal for the decay $D_s^{*+}to e^+nu_e$ is observed with a statistical significance of $2.9sigma$. The branching fraction of ${D_s^{*+}to e^+nu_e}$ is measured to be $(2.1{^{+1.2}_{-0.9}}_{rm stat.}pm0.2_{rm syst.})times 10^{-5}$, corresponding to an upper limit of $4.0times10^{-5}$ at the 90% confidence level. Taking the total width of the $D_s^{*+}$~(($0.070pm0.028$) keV) predicted by lattice quantum chromodynamics as input, the decay constant of the $D^{*+}_s$ is determined to be $f_{D_s^{*+}}=(213.6{^{+61.0}_{-45.8}}_{rm stat.}pm43.9_{rm syst.})$ MeV, corresponding to an upper limit of 353.8 MeV at the 90% confidence level." @default.
- W4367000403 created "2023-04-27" @default.
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