N ov 2 00 5 Study of the decay φ → f 0 ( 980 ) γ → π + π − γ with the KLOE detector
نویسندگان
چکیده
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 use different theoretical models to fit the spectrum and we determine the f0 mass and coupling constants to the φ, to π +π− and to KK̄.
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