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Weak Effects in Sigma-zero Decay (1979) |
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(1) This coupling to the photon can arise from 
couplings between the quarks, and therefore does not correspond to a second-class effect, which should be (essentially) absent in a gauge theory.
(2) R. E. Behrends, Phys. Rev. 111, 1691 (1958).
(3) M. A. Shifman, A. I. Vainshtein, and V. I. Zakharov, ITEP Report No. ITEP-113, 1976 (unpublished).
(4) H. S. Mani and H. S. Sharatchandra, Phys. Rev. D 10, 2849 (1974); J. Schecter and M. Singer, Nuovo Cimento 26A, 117 (1975); E. S. Abers and M. Sharif, Phys. Rev. D 16, 2237 (1977); M. A. Pérez, ibid 19, 400 (1979).
