K. Liu

Observation of $e^+e^-\toπ^0π^0ψ_2(3823)$

BESIII Collaboration, M. Ablikim, Mikhail N. Achasov, P. Adlarson et autres

Using a data sample corresponding to an integrated luminosity of 11.3 $\rm fb^{-1}$ collected at center-of-mass energies from $4.23$ to $4.70$~GeV with the BESIII detector, we observe the process $e^+e^-\toπ^0π^0ψ_2(3823)$ for the first time with a statistical significance of $6.0σ$. The ratio …

Study of light scalar mesons through Ds+→π0π0e+νe and KS0KS0e+νe decays

Mikhail N. Achasov, P. Adlarson, S. Ahmed, M. Albrecht et autres

Using $6.32\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of ${e}^{+}{e}^{\ensuremath{-}}$ collision data recorded by the BESIII detector at center-of-mass energies between 4.178 to 4.226 GeV, we present the first measurement of the decay ${D}_{s}^{+}\ensuremath{\rightarrow}{f}_{0}(980){e}^{+}{\ensuremath{\nu}}_{e},\phantom{\rule{0ex}{0ex}}{f}_{0}(980)\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$. The product branching fraction of ${D}_{s}^{+}\ensuremath{\rightarrow}{f}_{0}(980){e}^{+}{\ensuremath{\nu}}_{e},{f}_{0}(980)\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ is measured to be $(7.9\ifmmode\pm\else\textpm\fi{}1.{4}_{\mathrm{stat}}\ifmmode\pm\else\textpm\fi{}0.{4}_{\mathrm{syst}})\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$, with …

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