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I want to get this Feynman diagram: enter image description here

I have following code, however when I add \(g(b,\overline a)\) , I get many errors. Could you please tell me how should I get desired result?

\begin{center}
\feynmandiagram[horizontal=a to b]{
    i1[particle=\(u(r)\)] -- [anti fermion] a -- [anti fermion] i2[particle=\(u(b)\)],
    a -- [gluon, edge label= \(g\)] b,
};
\end{center}
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  • @campa Awesome, it worked! Thanks a lot.
    – somerandomguest
    Oct 7, 2021 at 16:23
  • 1
    I was exactly answering this. @somerandomguest also please make your MWE compilable right away (I had to guess that you used tikz-feynman from your other question, I’ve never used that before), the standalone class is quite nice for this. ;)
    – Archange
    Oct 7, 2021 at 16:27

1 Answer 1

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This is due to parsing issue with the comma, you have to use braces {}:

\documentclass{standalone}

\usepackage{tikz-feynman}

\begin{document}

\feynmandiagram[horizontal=a to b]{
    i1[particle=\(u(r)\)] -- [anti fermion] a -- [anti fermion] i2[particle=\(u(b)\)],
    a -- [gluon, edge label= {\(g,\overline a\)}] b,
};

\end{document}

The output: feynman

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