Measurement of $e^{+}e^{-} \to ��^{0}��^{0}��(3686)$ at $\sqrt{s}$ from 4.009 to 4.600 GeV and observation of a neutral charmoniumlike structure
説明
Using $e^{+}e^{-}$ collision data collected with the BESIII detector at the BEPCII collider corresponding to an integrated luminosity of 5.2 $fb^{-1}$ at center-of-mass energies ($\sqrt{s}$) from 4.009 to 4.600 GeV, the process $e^{+}e^{-} \to ��^{0} ��^{0}��(3686)$ is studied for the first time. The corresponding Born cross sections are measured and found to be half of those of the reaction $e^{+}e^{-} \to ��^{+}��^{-}��(3686)$. This is consistent with the expectation from isospin symmetry. Furthermore, the Dalitz plots for $��^{0}��^{0}��(3686)$ are accordant with those of $��^{+}��^{-}��(3686)$ at all energy points, and a neutral analogue to the structure in $��^\pm ��(3686)$ around 4040 MeV/$c^{2}$ first observed at $\sqrt{s}$=4.416 GeV is observed in the isospin neutral mode at the same energy.
