The authors compute mass spectra, rearrangement decays, and Regge trajectories for cs s-bar s-bar tetraquarks modeled as axial [cs][s-bar s-bar] systems in a Cornell potential framework with Ds threshold inputs.
Observation of the Dalitz Decay $D_{s}^{*+} \to D_{s}^{+} e^{+} e^{-}$
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abstract
Using 586 $\textrm{pb}^{-1}$ of $e^{+}e^{-}$ collision data acquired at $\sqrt{s}=4.170$ GeV with the CLEO-c detector at the Cornell Electron Storage Ring, we report the first observation of $D_{s}^{*+} \to D_{s}^{+} e^{+} e^{-}$ with a significance of $5.3 \sigma$. The ratio of branching fractions $\calB(D_{s}^{*+} \to D_{s}^{+} e^{+} e^{-}) / \calB(D_{s}^{*+} \to D_{s}^{+} \gamma)$ is measured to be $[ 0.72^{+0.15}_{-0.13} (\textrm{stat}) \pm 0.10 (\textrm{syst})]%$, which is consistent with theoretical expectations.
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UNVERDICTED 2representative citing papers
Fitting independent quark couplings of the X17 boson to D, psi(2S), and phi decay data yields |ε_c| = 7.6×10^{-3}, |ε_s| = 2.4×10^{-3}, a huge |ε_u| in tension with ATOMKI, and a predicted range for the D^{*+} → D^{+} e⁺e⁻ rate.
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Compact $cs\bar{s}\bar{s}$ Tetraquarks in the Charm--Strange Sector: Mass Spectra, Rearrangement Decays and Regge Trajectories with $D_s$ Threshold Inputs
The authors compute mass spectra, rearrangement decays, and Regge trajectories for cs s-bar s-bar tetraquarks modeled as axial [cs][s-bar s-bar] systems in a Cornell potential framework with Ds threshold inputs.
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Testing the hypothesis of vector X17 boson by D meson, Charmonium, and $\phi$ meson decays
Fitting independent quark couplings of the X17 boson to D, psi(2S), and phi decay data yields |ε_c| = 7.6×10^{-3}, |ε_s| = 2.4×10^{-3}, a huge |ε_u| in tension with ATOMKI, and a predicted range for the D^{*+} → D^{+} e⁺e⁻ rate.