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

1994/02/03 by A. E. Kaloshin, V. M. Persikov, V. V. Serebryakov
Physics and Astronomy · #hep-ph

paper · pdf

published as Phys.Atom.Nucl. 57 (1994) 2207-2208; Yad.Fiz. 57N12 (1994) 2298-2299 · Latex, 5 pages, no figures, ISU-IAP.Th94-01, Irkutsk

arxiv created 1994/02/03 · arxiv updated 2009/11/30

Abstract

We carry out the semi--model analysis of existing data on the angular distributions of the γγ→π⁺ π^- , π⁰ π⁰ 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: (α+ β)^π+ = 0.28 ± 0.07 (MARK-II \citeM2), (α+ β)^π+ = 0.38 ± 0.05 (CELLO \citeCELLO), (α+ β)^π0 = 1.26 ± 0.06 (Crystal Ball \citeCB) in units of 10^-42 cm³ (e²=4 πα).

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