If I use scalebox, the labels of the vertices are too big compared to those of the particles.
\scalebox{2.5}{
\feynmandiagram [horizontal=a to b] {
i1 [node font=\tiny, particle=$e^-$] -- [fermion, arrow size=0.8pt, momentum={[arrow shorten=0.3, node font=\tiny]$k_1$}] a [label=${\mu}$]-- [fermion, arrow size=0.8pt, rmomentum={[arrow shorten=0.3, node font=\tiny]$k_2$}] i2 [node font=\tiny, particle=$e^+$],
a -- [photon,node font=\tiny, edge label=\(\gamma\), momentum'={[arrow shorten=0.3, node font=\tiny]$q$}] b [label=$\nu$],
f1 [node font=\tiny, particle=$\mu^+$] -- [fermion, arrow size=0.8pt, rmomentum'={[arrow shorten=0.3, node font=\tiny]$p_2$}] b -- [fermion, arrow size=0.8pt, momentum'={[arrow shorten=0.3, node font=\tiny]$p_1$}] f2 [node font=\tiny, particle=$\mu^-$],
};
}
How can I fix that (still using scalebox) ?
\documentclass
and the appropriate packages so that those trying to help don't have to recreate it.