Another look at the angular distributions of the $γγ\toπ π$ reactions

Details Another look at the angular distributions of the $γγ\toπ π$ reactions Another look at the angular distributions of the $γγ\toπ π$ reactions

1995-04-07

arxiv.org/abs/hep-ph/9504261v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, four figures (POSTSCRIPT)

Scientific paper

We analyze the existing data on the angular distributions of the $\gamma\gamma\to \pi^+ \pi^- ,\pi^0 \pi^0$ reactions with using of the unitary model for helicity 2 amplitude. The purpose is to obtain the D--wave parameters and S--wave cross section. We obtain from experiment in the first time the values of $\alpha + \beta$ for sum of the electric and magnetic pion's polarizabilities. We found the S-wave cross sections much smaller as compared with previous similar analysis. Comparison of the $\gamma\gamma\to \pi^+ \pi^-$ and $\gamma\gamma\to \pi^0 \pi^0$ data gives an indication for a marked I = 2, J = 2 contribution in region of $f_2(1270)$.

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