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Upper limit on the $\eta\to\pi^{+}\pi^{-}$ branching fraction with the KLOE experiment
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abstract
Based on an integrated luminosity of 1.61 fb$^{-1}$ $e^+e^-$ collision data collected with the KLOE detector at DA$\Phi$NE, the Frascati $\phi$-factory, a search for the $P$- and $CP$-violating decay $\eta\to\pi^{+}\pi^{-}$ has been performed. Radiative $\phi\to\eta\gamma$ decay is exploited to access the $\eta$ mesons. No signal is observed in the $\pi^{+}\pi^{-}$ invariant mass spectrum, and the upper limit on the branching fraction at 90\% confidence level is determined to be ${\mathcal B}(\eta\to\pi^{+}\pi^{-})<4.9\times10^{-6}$, which is approximately three times smaller than the previous KLOE result. From the combination of these two measurements we get ${\mathcal B}(\eta\to\pi^{+}\pi^{-}) < 4.4\times10^{-6}$ at 90\% confidence level.
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Cited by 1 Pith paper
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Simulation of dark scalar particle sensitivity in $\eta$ rare decay channels at HIAF
A one-month HIAF simulation projects branching-ratio upper limits of about 10^-9 (e+e-) and 10^-6 (pi pi) for eta decays to a dark scalar, with parameter sensitivities beyond current bounds.
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