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Amplitude Analysis of high statistics results on γγ → π + π− and the two photon width of isoscalar states

By M. R. Pennington, T. Mori and S. Uehara


We perform an Amplitude Analysis of the world published data on γγ → π + π − and π 0 π 0. These are dominated in statistics by the recently published results from Belle on the charged pion channel. Nevertheless, having only limited angular information, a range of solutions remain possible. We present two solutions with Γ(f0(980) → γγ) = 0.42 and 0.10 keV, and Γ(f2(1270) → γγ) = 3.14 ± 0.20 and 3.82 ± 0.30 keV, respectively: the former being the solution favoured by χ 2, the latter at the edge of acceptability. Models of the structure of the f0(980) predict two photon widths to be between 0.2 and 0.6 keV, depending on its composition as mainly KK, ss or qqqq. Presently available data cannot yet distinguish unambiguously between these predictions. However, we show how forthcoming results on γγ → π 0 π 0 can not only discriminate between, but also refine, these classes of partial wave solutions. 1

Year: 2013
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