The axial vector current in beta decay

S. M. Berman:Phys. Rev.,112, 267 (1958).

Private communication fromV. L. Telegdi on the work of the Chicago group.

R. P. Feynman andM. Gell-Mann:Phys. Rev.,109, 193 (1958).

E. C. G. Sudarshan andR. E. Marshak:Phys. Rev.,109, 1860 (1958).

S. S. Gershtein andJ. B. Zeldovich:Žurn. Ėksp. Teor. Fiz.,29, 698 (1955) (translation:Sov. Phys. Journ. Exp. Theor. Phys.,2, 576 (1957)).

D. A. Bromley, E. Almquist, H. E. Gove, A. E. Litherland, E. B. Paul andA. J. Ferguson:Phys. Rev.,105, 957 (1957).

M. Gell-Mann:Phys. Rev.,111, 362 (1958).

M. T. Burgy, V. E. Krohn, T. B. Novey, G. R. Ringo andV. L. Telegdi:Phys. Rev.,110, 1214 (1958). See alsoC. S. Wu:Rev. Mod. Phys.,31, 783 (1959).

J. C. Taylor:Phys. Rev.,110, 1216 (1958);M. L. Goldberger andS. B. Treiman:Phys. Rev.,110, 1478 (1958).

R. J. Blin-Stoyle:Nuovo Cimento,10, 132 (1958);S. Okubo:Nuovo Cimento,13, 292 (1959).

ByR. P. Feynman, with some assistance from one of us (M. G.-M.).

R. E. Norton andW. K. R. Watson:Phys. Rev.,110, 996 (1958).

J. C. Taylor: quoted in ref. (17). See alsoR. F. Streater andJ. C. Taylor:Nucl. Phys.,7, 276 (1958).

M. L. Goldberger andS. B. Treiman:Phys. Rev.,110, 1178 (1958). A recent criticism of their paper has been given byR. F. Sawyer:Phys. Rev.,116, 231 (1959); like us,Sawyer seeks a better derivation of their result.

As listed byK. M. Crowe:Nuovo Cimento,5, 541 (1957).

See forthcoming article byBernstein, Fubini, Gell-Mann andThirring.

Our point of view in this section has much in common with that ofS. Glashow:Nucl. Phys.,10, 107 (1959), as well as that ofS. Bludman:Nuovo Cimento,9, 433 (1958). See, also, the earlier work ofJ. Schwinger: ref. (16).

J. Schwinger:Ann. Phys.,2, 407 (1957).

J. C. Polkinghorne:Nuovo Cimento,8, 179, 781 (1958).

J. Bernstein, M. Gell-Mann andL. Michel:Nuovo Cimento,16, 560 (1960).

M. Gell-Mann:Phys. Rev.,106, 1296 (1957) andJ. Schwinger: ref. (16).

F. Gürsey:Nuovo Cimento,16, 230 (1960).

A. Pais:Proc. Nat. Acad. Sci.,40, 835 (1954).