First estimates of the $(α+ β)^π$ from two--photon experiments

Details First estimates of the $(α+ β)^π$ from two--photon experiments First estimates of the $(α+ β)^π$ from two--photon experiments

1994-02-03

arxiv.org/abs/hep-ph/9402220v1

Phys.Atom.Nucl. 57 (1994) 2207-2208; Yad.Fiz. 57N12 (1994) 2298-2299

Physics

High Energy Physics

High Energy Physics - Phenomenology

Latex, 5 pages, no figures, ISU-IAP.Th94-01, Irkutsk

Scientific paper

We carry out the semi--model analysis of existing data on the angular distributions of the $\gamma\gamma\rightarrow\pi^+ \pi^- ,\ \pi^0 \pi^0$ reactions with purpose to obtain S-wave cross section and D-wave's parameters. In the first time we obtain from experiment the sum of electrical and magnetic pion polarizabilities: $(\alpha + \beta)^{\pi^+} = 0.28 \pm 0.07$ (MARK-II \cite{M2}), \ \ $(\alpha + \beta)^{\pi^+} = 0.38 \pm 0.05$ (CELLO \cite{CELLO}), \ \ $(\alpha + \beta)^{\pi^0} = 1.26 \pm 0.06$ (Crystal Ball \cite{CB}) \ \ in units of $10^{-42} \ cm^3$ ($e^2=4 \pi \alpha$).

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