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Searching for η → γγγ decay The KLOE

Data collected by the KLOE experiment in years 2001/2002 for a total integrated luminosity of 410 pb−1, corresponding to 17 million of produced η’s from the Φ → ηγ radiative decay, have been analyzed to look for the C-violating decay η → γγγ. The signal is searched in events with 4 photons in the final state by using the spectrum of the most energetic photon. The background is evaluated from the data themself, doing a fifth degree polynomial fit outside the signal region, and extrapolating inside it. No signal has been observed and taking into account a selection efficiency ǫ = 20.3% we get from a likelihood fit Br(η → γγγ) ≤ 1.6 × 10−5 at 95% CL. The procedure has a systematic ambiguity at the 35 % level.