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Search for a strangeonium-like structure Z_s decaying into φ π and a measurement of the cross section e^+e^-rightarrowφππ
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arxiv 1801.10384 v4 pith:Q4YOYGFX submitted 2018-01-31 hep-ex
Search for a strangeonium-like structure Z_s decaying into φ π and a measurement of the cross section e^+e^-rightarrowφππ
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Using a data sample of $e^+e^-$ collision data corresponding to an integrated luminosity of 108 pb$^{-1}$ collected with the BESIII detector at a center-of-mass energy of 2.125 GeV, we study the process $e^+e^-\rightarrow \phi\pi\pi$ and search for a strangeoniumlike structure $Z_s$ decaying into $\phi\pi$. No signal is observed in the $\phi\pi$ mass spectrum. Upper limits on the cross sections for $Z_s$ production at the 90\% confidence level are determined. In addition, the cross sections of $e^+e^-\rightarrow\phi\pi^{+}\pi^{-}$ and $e^+e^-\rightarrow\phi\pi^{0}\pi^{0}$ at 2.125 GeV are measured to be $(436.2\pm6.4\pm30.1)$ pb and $(237.0\pm8.6\pm15.4)$ pb, respectively, where the first uncertainties are statistical and the second systematic.
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