Trying to put Feyman Diagram side by side horizontally w/ "+" in between.

Question

So i've been trying several threads in this forum on how to make my feynman diagrams look side by side. The problem is that no thing seems to work, this is how my two diagram look:

and this is my code:

\begin{figure}[H]
\feynmandiagram [large, vertical= b to b1] {
a [particle=\(\nu_\mu\)] -- [anti fermion] b --  [charged boson,edge 
label=$Z^0$] b1 [dot],
c [particle=\(\nu_\mu\)] -- [ fermion] b,
b1 -- [double,with arrow=0.5,edge label=$\mathcal{P}$] i2,
b2 -- [anti fermion,edge label=$N$] i2,
b3 -- [fermion,edge label=$N$] i2,
b1 -- [charged scalar,edge label=$\pi^0$] i3,
}; 

\feynmandiagram [large, vertical=b to b1] {
a [particle=\(\nu_\mu\)] -- [anti fermion] b  -- [charged boson,edge 
label=$Z^0$] b1 [blob] ,
c [particle=\(\nu_\mu\)] -- [ fermion] b,

i4 -- [fermion,edge label=$N$] b1,
b1 -- [fermion, bend right=10, edge label = $Hadrons$] i5,
b1 -- [charged boson,edge label=$\pi^0$] i7,
};
\caption{\label{fig:fi} Semi inclusive COH + DIS + RES $\pi^0$ 
 production.}
\end{figure}

I would like to put them side by side with a "+" sign in between them. Any help will be greatly appreciated. Thanks!

Answer 1

The perhaps simplest way is to use the inline option and to put the diagrams in a math environment (because of the + and spacing).

\documentclass[a4paper]{article}
\usepackage{tikz-feynman}
\begin{document}
\begin{figure}[h]
\[
\feynmandiagram [large, vertical= b to b1,inline=(b1.base)] {
a [particle=\(\nu_\mu\)] -- [anti fermion] b --  [charged boson,edge 
label=$Z^0$] b1 [dot],
c [particle=\(\nu_\mu\)] -- [ fermion] b,
b1 -- [double,with arrow=0.5,edge label=$\mathcal{P}$] i2,
b2 -- [anti fermion,edge label=$N$] i2,
b3 -- [fermion,edge label=$N$] i2,
b1 -- [charged scalar,edge label=$\pi^0$] i3,
}; 
+
\feynmandiagram [large, vertical=b to b1,inline=(b1.base)] {
a [particle=\(\nu_\mu\)] -- [anti fermion] b  -- [charged boson,edge 
label=$Z^0$] b1 [blob] ,
c [particle=\(\nu_\mu\)] -- [ fermion] b,

i4 -- [fermion,edge label=$N$] b1,
b1 -- [fermion, bend right=10, edge label = $Hadrons$] i5,
b1 -- [charged boson,edge label=$\pi^0$] i7,
};
\]
\caption{\label{fig:fi} Semi inclusive COH + DIS + RES $\pi^0$ 
 production.}
\end{figure}
\end{document}

BTW, this is now at least your third question here, but so far you have not given any feedback on the answers you received. It would be great if you could do that.