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تسجيل مستخدم جديد$gammagamma$ physics with the KLOE experiment
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The processes $e^+e^-to e^+e^-X$, with $X$ being either the $eta$ meson or $pi^0pi^0$, 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 $gammagammatoeta$ process, with both $etatopi^+pi^-pi^0$ and $etatopi^0pi^0pi^0$ channels, and the evidence for $gammagammatopi^0pi^0$ production at low $pi^0pi^0$ invariant mass.
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