$γγ$ physics with the KLOE experiment

Details $γγ$ physics with the KLOE experiment $γγ$ physics with the KLOE experiment

2011-07-19

arxiv.org/abs/1107.3782v1

Physics

High Energy Physics

High Energy Physics - Experiment

Contributed paper to the Lepton-Photon 2011 Conference

Scientific paper

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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