Let be the nuclear reaction:(adsbygoogle = window.adsbygoogle || []).push({});

[tex] ee \rightarrow e+e+ [/tex] (if not possible a similar one)

Of course we have 2 states |A> with 2 electrons and |B> with two "positrons"..if we wished to compute the transition probability we should know:

[tex] <B|S|A> [/tex] where "S" is the S-Matrix..my question is..is there any variational method to obtain the coefficients of the Matrix S?..if not could be one or is mathematically impossible?..thanks.

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# Variatonal principles in quantum Field Theory

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