Using data samples with a total integrated luminosity of $22.1~\mathrm{fb}^{-1}$ at center-of-mass energies between $4.008$ and $4.951~\mathrm{GeV}$ collected with the BESIII detector, the cross sections of the process $e^+e^- \to \pi^0\pi^0\psi(3686)$ are measured. The obtained cross sections are found to be approximately one-half of those of $e^+e^- \to \pi^+\pi^-\psi(3686)$, consistent with the expectation from isospin symmetry. A coherent fit to the dressed cross sections is performed, with the $Y(4230)$ parameters fixed to the values measured in the $e^+e^- \to \pi^+\pi^-\psi(3686)$ process. The significances of the $Y(4390)$ and $Y(4660)$ are both greater than $5\sigma$, and their masses and widths are consistent with the previous measurements in the $e^+e^- \to \pi^+\pi^-\psi(3686)$ channel.
Cross section measurement of 𝑒+𝑒− →𝜋0𝜋0𝜓(3686) from √𝑠 =4.008 GeV to 4.951 GeV
Garzia, I.;Melendi, F. M.;
2026
Abstract
Using data samples with a total integrated luminosity of $22.1~\mathrm{fb}^{-1}$ at center-of-mass energies between $4.008$ and $4.951~\mathrm{GeV}$ collected with the BESIII detector, the cross sections of the process $e^+e^- \to \pi^0\pi^0\psi(3686)$ are measured. The obtained cross sections are found to be approximately one-half of those of $e^+e^- \to \pi^+\pi^-\psi(3686)$, consistent with the expectation from isospin symmetry. A coherent fit to the dressed cross sections is performed, with the $Y(4230)$ parameters fixed to the values measured in the $e^+e^- \to \pi^+\pi^-\psi(3686)$ process. The significances of the $Y(4390)$ and $Y(4660)$ are both greater than $5\sigma$, and their masses and widths are consistent with the previous measurements in the $e^+e^- \to \pi^+\pi^-\psi(3686)$ channel.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
