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## Main Question or Discussion Point

Please teach me this:

When we use cutting rule for Bhabha scattering to cut the Feymann diagram to parts.Why we know the two parts are complex conjugation of each other,so we have optical theorem:

2ImM(s)=.... M.M*...

Thank you very much in advanced

When we use cutting rule for Bhabha scattering to cut the Feymann diagram to parts.Why we know the two parts are complex conjugation of each other,so we have optical theorem:

2ImM(s)=.... M.M*...

Thank you very much in advanced