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We measured, with the KLOE detector, the spectrum of π+π− invariant mass in a sample of 6.7×105 e+e−→π+π−γ events with the photon at large polar angle (θγ>45°) at a centre of mass energy s around the ϕ mass. We observe in this spectrum a clear contribution from the intermediate process ϕ→ f0(980)γ. A sizeable effect is also observed in the distribution of the pion forward–backward asymmetry. We...
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