I have to draw a diagram for radiative corrections on an external field, but I would like to make half-loops for self-energy of electron on the slanted fermionic lines (see figure and code). I tried this but it doesn't seem to have any effect. There is nothing on the documentation. Could anyone help me?
\begin{tikzpicture}
\begin{feynman}
\vertex (a) ;
\vertex[below right= of a] (b);
\vertex[above right= of b] (c);
\vertex[crossed dot, below= of b] (d) {};
\diagram* {
(a) -- [fermion] (b) -- [fermion] (c);
(b) -- [boson] (d);
};
\draw [boson, half left] ($(b)!0.2!(c)$) -- ($(b)!0.8!(c)$);
\end{feynman}
\end{tikzpicture}
Is it possibile to add momentum for this half loop?
EDIT:
https://www.overleaf.com/8134191135krhdbksyvxpg
the idea is to draw these