Majorana Fermion with non-hermitian mediator
Asked by
Vinicius
I implemented in Calchep a generic model that I am working. When I put in Calchep the process: S2 + N2 -> N1 + S1 (where S1,S2,N1 and N2 are majorana fermions, moreover this process is mediated by a non-hermitian boson U, that is neutral).
I do not understand why Calchep consider for this process (S2 + N2 -> N1 + S1 ), the contribution of theses two diagrams:
S2 N1
=====@=====
|
U|
N2 | S1
=====@=====
and
S2 N1
=====@=====
|
\bar{U}|
N2 | S1
=====@=====
Since theses contributions have the same vertices, same contribution, and equal amplitude.
Thanks,
Vinicius
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