High statistics study of f0(980) resonance in gamma gamma --> pi+ pi- production
Abstract
We report on a high statistics measurement of the cross section of the process gamma gamma to pi+ pi- in the center-of-mass energy range 0.8 GeV/c2 < W < 1.5 GeV/c2 with 85.9 fb-1 of data collected at sqrt(s)=10.58 GeV and 10.52 GeV with the Belle detector. A clear signal for the f0 lr 980 resonance is observed. From a fit to the mass spectrum, the resonance's mass, pi+ pi- and two-photon decay widths are found to be 985.6+1.2 -1.5(stat)+1.1-1.6(syst) MeV/c2, 34.2+13.9-11.8(stat)+8.8-2.5(syst) MeV, and 205+95-83(stat)+147-117(syst) eV, respectively.
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