Hello i am trying to make a Feynman diagram with this code

every vertex={red, dot},
every particle={blue},
every blob={draw=green!40!black, pattern color=green!40!black},
\feynmandiagram [horizontal=a to b] {
a [particle={\(\gamma, Z\)}] -- [fermion] b [blob],
c -- [fermion] b -- [fermion] d,
\caption{\label{fig:firstmesonimag} A $\pi^0$ decaying onto two gammas.}

and i am getting something like this

and i want to make something like this

enter image description here

Can anyone help how to get the double fermion horizontally along with the incoming nucleus?

Any help will greatly appreciated.



  \feynmandiagram [horizontal=a to d] {
    a -- [fermion,edge label=$N$] b [dot] -- [double,with arrow=0.5,edge label=$\mathcal{R}$] c -- [fermion,edge label=$N'$] d,
    i -- [charged boson,edge label=$W^i$] b,
    c -- [charged scalar,edge label=$\pi$] o,


enter image description here

  • Thanks Henri Menke! that was quite a useful solution. Greatly appreciated! – spacecatbro Apr 3 '18 at 2:31
  • I was also wondering how would you also include label on the vertices? if that's possible. – spacecatbro Apr 3 '18 at 2:38
  • 1
    @spacecatbro That can be easily achieved by reading the manual (PDF). – Henri Menke Apr 3 '18 at 5:42

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