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 > > By the way, your term "i/2 sigma^uv (p'-p)_v" has an sic: it is either > "i/2 [gamma^u,gamma^v] (p'-p)_v" or "sigma^uv (p'-p)_v" but not "i/2 > sigma^uv (p'-p)_v." Actually, Igor, I need to correct the above; your original post was are correct; I misread the meaning of Weinberg's notation for the sigma^uv. The calculation I posted at http://home.nycap.rr.com/jry/Papers/...alculation.pdf has a factor that is off by -1/8, that is, all the F_2^2 terms need to be multiplied by -1/8 to be correct. Corrected repost will follow in due course. Jay.