Article

# $\gamma\gamma$ physics with the KLOE experiment

07/2011;
Source: arXiv

ABSTRACT The processes $e^+e^-\to e^+e^-X$, with $X$ being either the $\eta$ meson or
$\pi^0\pi^0$, are studied at DA$\Phi$NE, with $e^+e^-$ beams colliding at
$\sqrt{s}\simeq1$ GeV, below the $\phi$ resonance peak. The data sample is from
an integrated luminosity of 240 pb$^{-1}$, collected by the KLOE experiment
without tagging of the outgoing $e^+e^-$. Preliminary results are presented on
the observation of the $\gamma\gamma\to\eta$ process, with both
$\eta\to\pi^+\pi^-\pi^0$ and $\eta\to\pi^0\pi^0\pi^0$ channels, and the
evidence for $\gamma\gamma\to\pi^0\pi^0$ production at low $\pi^0\pi^0$
invariant mass.

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### Keywords

$\phi$ resonance peak

data sample

integrated luminosity

invariant mass

tagging