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- W4297437369 abstract "We report a measurement of the cross section for the process $e^+e^-topi^+pi^-J/psi$ around the $X(3872)$ mass in search for the direct formation of $e^+e^-to X(3872)$ through the two-photon fusion process. No enhancement of the cross section is observed at the $X(3872)$ peak and an upper limit on the product of electronic width and branching fraction of $X(3872)topi^+pi^-J/psi$ is determined to be $Gamma_{ee}timesmathcal{B}(X(3872)topi^+pi^-J/psi)<7.5times10^{-3},text{eV}$ at $90,%$ confidence level under an assumption of total width of $1.19pm0.21$ MeV. This is an improvement of a factor of about $17$ compared to the previous limit. Furthermore, using the latest result of $mathcal{B}(X(3872)topi^+pi^-J/psi)$, an upper limit on the electronic width $Gamma_{ee}$ of $X(3872)$ is obtained to be $<0.32,text{eV}$ at the $90,%$ confidence level." @default.
- W4297437369 created "2022-09-28" @default.
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