Observation of a resonant structure in $e^{+}{e}^{-}\to K^{+}{K}^{-}{\pi }^0{\pi }^0$

Abstract

Using $e^{+}{e}^{-}$ collision data samples with center-of-mass energies ranging from 2.000 to 2.644 GeV, collected by the BESIII detector at the BEPCII collider, and with a total integrated luminosity of 300 pb^{-1}, a partial-wave analysis is performed for the process $e^{+}{e}^{-}\to K^{+}{K}^{-}{\pi }^0{\pi }^0$. The total Born cross sections for the process $e^{+}{e}^{-}\to K^{+}{K}^{-}{\pi }^0{\pi }^0$, as well as the Born cross sections f or the subprocesses $e^{+}{e}^{-}\to \varphi {\pi }^0{\pi }^0$, $K^{+}(1460)K^{-}$, $K_1^{+}(1400)K^{-}$, $K_1^{+}(1270)K^{-}$ and $K^{\ast +}(892)K^{\ast -}(892)$, are measured versus the center-of-mass energy. The corresponding results for $e^{+}{e}^{-}\to K^{+}{K}^{-}{\pi }^0{\pi }^0$ and $\varphi {\pi }^0{\pi }^0$ are consistent with those of BaBar and have much improved precision.By analyzing the cross sections for the four subprocesses, $K^{+}(1460)K^{-}$, $K_1^{+}(1400)K^{-}$, $K_1^{+}(1270)K^{-}$ and $K^{\ast +}{K}^{\ast -}$, a structure with mass $M$ = (2126.5 $\pm$ 16.8 $\pm$ 12.4)~MeV/c^{2} and width $\Gamma$ = (106.9 $\pm$ 32.1 $\pm$ 28.1)~MeV is observed with an overall statistical significance of 6.3 $\sigma$, although with very limited significance in the subprocesses $e^{+}{e}^{-}\to K_1^{+}(1270)K^{-}$ and $K^{\ast +}(892)K^{\ast -}(892)$. The resonant parameters of the observed structure suggest it can be identified with the $\varphi (2170)$, thus the results provide valuable input to the internal nature of the $\varphi (2170)$.

References in corpus (10)

• Matching perturbative and Parton Shower corrections to Bhabha process at flavour factories
• X(2175) as a resonant state of the $\varphi K\bar{K}$ system
• Observation of Y(2175) in $J/\psi \to \eta \varphi f_0(980)$
• Analysis of Y(2175) as a tetraquark state with QCD sum rules
• A Candidate for $1^{--}$ Strangeonium Hybrid
• Y(2175): Distinguish Hybrid State from Higher Quarkonium
• Higher Tetraquark Particles
• The Y(2175) State in the QCD Sum Rule
• Study of J/psi->eta phi pi+pi- at BESIII
• ϕK^{+}K^{-} production in electron-positron annihilation

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• Possible Assignment of Excited Light ${}^3{S}_1$ Vector Mesons
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