High statistics measurement of the cross-sections of gamma gamma ---> pi+ pi- production

We report on a high statistics measurement of the total and differential cross sections of the process gamma gamma -> pi^+ pi^- in the pi^+ pi^- invariant mass range 0.8 GeV/c^2 < W < 1.5 GeV/c^2 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 of the f_0(980) resonance is observed in addition to the f_2(1270) resonance. An improved 90% confidence level upper limit Br.(eta'(958) -> pi^+ pi^-) < 2.9 x 10^{-3} is obtained for P- and CP-violating decay of the eta'(958) meson using the most conservative assumption about the interference with the background.

two-photon production
f0(980)
f2(1270)
eta'(958)
gammagamma->pi+pi- cross section
electron positron: colliding beams
exchange: two-photon
photon photon: exclusive reaction
pi: pair production
mass spectrum: (pi+ pi-)

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