Observation of a Resonant Structure in e+e−→K+K−π0π0

Résumé fourni par la source

A partial-wave analysis is performed for the process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ at the center-of-mass energies ranging from 2.000 to 2.644 GeV. The data samples of ${e}^{+}{e}^{\ensuremath{-}}$ collisions, collected by the BESIII detector at the BEPCII collider with a total integrated luminosity of $300\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$, are analyzed. The total Born cross sections for the process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$, as well as the Born cross sections for the subprocesses ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\phi}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$, ${K}^{+}(1460){K}^{\ensuremath{-}}$, ${K}_{1}^{+}(1400){K}^{\ensuremath{-}}$, ${K}_{1}^{+}(1270){K}^{\ensuremath{-}}$, and ${K}^{*+}(892){K}^{*\ensuremath{-}}(892)$, are measured versus the center-of-mass energy. The corresponding results for ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ and $\ensuremath{\phi}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ are consistent with those of BABAR with better precision. By analyzing the cross sections for the four subprocesses, ${K}^{+}(1460){K}^{\ensuremath{-}}$, ${K}_{1}^{+}(1400){K}^{\ensuremath{-}}$, ${K}_{1}^{+}(1270){K}^{\ensuremath{-}}$, and ${K}^{*+}(892){K}^{*\ensuremath{-}}(892)$, a structure with mass $M=(2126.5\ifmmode\pm\else\textpm\fi{}16.8\ifmmode\pm\else\textpm\fi{}12.4)\text{ }\text{ }\mathrm{MeV}/{c}^{2}$ and width $\mathrm{\ensuremath{\Gamma}}=(106.9\ifmmode\pm\else\textpm\fi{}32.1\ifmmode\pm\else\textpm\fi{}28.1)\text{ }\text{ }\mathrm{MeV}$ is observed with an overall statistical significance of $6.3\ensuremath{\sigma}$, although with very limited significance in the subprocesses ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}_{1}^{+}(1270){K}^{\ensuremath{-}}$ and ${K}^{*+}(892){K}^{*\ensuremath{-}}(892)$. The resonant parameters of the observed structure suggest it can be identified with the $\ensuremath{\phi}(2170)$, thus the results provide valuable input to the internal nature of the $\ensuremath{\phi}(2170)$.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.