Observation of the $\varphi (1680)$ and the Y(2175) in $e^{+}{e}^{-}\to \varphi {\pi }^{+}{\pi }^{-}$

Abstract

The cross sections for $e^{+}{e}^{-}\to \varphi {\pi }^{+}{\pi }^{-}$ and $e^+ e^- \to ϕ\fzero$ are measured from threshold to $\sqrt{s}=3.0$ $GeV$ using initial state radiation. The analysis is based on a data sample of 673 fb${}^{-1}$ collected on and below the ${\rm Y}(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider. First measurements are reported for the resonance parameters of the $\varphi (1680)$ in the $\varphi {\pi }^{+}{\pi }^{-}$ mode: $m=(1689\pm 7\pm 10)$ MeV/$c^2$ and $\Gamma =(211\pm 14\pm 19)$ MeV/$c^2$. A structure at $\sqrt{s}=2.1GeV/c^2$, corresponding to the so called Y(2175), is observed; its mass and width are determined to be $2079\pm 13_{-28}^{+79}$ MeV/$c^2$ and $192\pm 23_{-61}^{+25}MeV/c^2$, respectively.

11 pages, 6 figures. Add one plot. Accepted by Phys.Rev.D(RC)

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• A Structure at 2175 MeV in $e^{+}{e}^{-}\to \varphi f_0(980)$ Observed via Initial-State Radiation
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• Analysis of Y(2175) as a tetraquark state with QCD sum rules
• The $e^{+}{e}^{-}\to K^{+}{K}^{-}{\pi }^{+}{\pi }^{-}$, $K^{+}{K}^{-}{\pi }^0{\pi }^0$ and $K^{+}{K}^{-}{K}^{+}{K}^{-}$ Cross Sections Measured with Initial-State Radiation
• A Candidate for $1^{--}$ Strangeonium Hybrid
• Y(2175): Distinguish Hybrid State from Higher Quarkonium
• The Y(2175) State in the QCD Sum Rule

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