So this is the code that genreates the image below. I am trying to get the pointed arrows on the fermions but I have no idea why is not working wit particle. Any help will be appreciated.
\feynmandiagram [large, horizontal=i2 to d] {
a -- [fermion,edge label=$N$] i2 [dot] -- [anti charged boson,edge
label=$Z^0$] { b -- c1 [particle=\(\nu_\mu\)], b -- c2 [particle=\
(\nu_\mu\)] }, i2 --[double,with arrow=0.5,edge label=$\mathcal{R}$] { d
--[charged scalar,edge label=$\pi^0$] d1 , d -- [fermion,edge
label=$N$]d2} ,
};
\caption{\label{fig:irs} RES}
\end{figure}