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[en] Fermilab E781 plans measurements of γ-Sigma and γ-pion interactions using a 600 GeV beam of Sigmas and pions, and a virtual photon target. Pion polarizabilities and radiative transitions will be measured in this experiment. The former can test a precise prediction of chiral symmetry; the latter for α1 (1260) → πγ is important for understanding the polarizability. The experiment also measures polarizabilities and radiative transitions for Sigma hyperons. The polarizabilities can test predictions of baryon chiral perturbation theory. The radiative transitions to the Σ* (1385) provide a measure of the magnetic moment of the s-quark. Previous experimental and theoretical results for γπ and γΣ interactions are given. The E781 experiment is described. (orig.)
Source
Bernstein, A.M. (ed.) (Massachusetts Inst. of Tech., Cambridge, MA (United States). Dept. of Physics); Holstein, B.R. (ed.) (Massachusetts Inst. of Tech., Cambridge, MA (United States). Dept. of Physics); Lecture Notes in Physics; v. 452; 359 p; ISBN 3-540-59279-2; 
; 1995; p. 152-163; Springer; Berlin (Germany); Workshop on chiral dynamics: Theory and experiment; Cambridge, MA (United States); 25-29 Jul 1994; ISSN 0075-8450;
; 1995; p. 152-163; Springer; Berlin (Germany); Workshop on chiral dynamics: Theory and experiment; Cambridge, MA (United States); 25-29 Jul 1994; ISSN 0075-8450;