Extracting the f0(980) signal from the photoproduced π+ π- spectrum
1 State School of Higher Education in Oświęcim, Kolbego 8, 32–600, Oświęcim Poland
2 H. Niewodniczański Institute of Nuclear Physics PAN, Radzikówskiego 152, 31–342, Krakow Poland
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We present a phenomenological analysis of the π+π- photoproduction data obtained by the CLAS collaboration at the Thomas Jefferson Laboratory. A special emphasis is put on the interference pattern observed in the moments of angular distribution for the π+π- efective masses around 1 GeV. This pattern is attributed to the photoproduction of the scalar-isoscalar resonance f0(980). By fitting the model parameters to the data we obtain the strengths of the resonant and nonresonant parts of the S-wave photoproduction amplitude. We calculate the f0(980) photoproduction cross section which is smaller than previous estimations by a factor of about 5. A new estimation of the product of the σ meson couplings to nucleon and to the γρ system |gNNσgγρσ| is given.
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