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The four fermion interaction proposed by enrico fermi to learn weak interaction

postulates that four dirac fields interact via the interaction hamilton

J1[tex]^{}u[/tex]*J2[tex]_{}u[/tex]

where J1[tex]^{}u[/tex]=phi_d(x)*y[tex]^{}u[/tex]*phi_c(x)

but by question is this

is the bilinear form taken between wavefuctions asscoiated with different particles

conserve current just like [tex]\Psi[/tex]

[tex]\bar{}[/tex]*[tex]\gamma[/tex]*[tex]\Psi[/tex]

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# Four fermion interaction?

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