Tikz Feynman 在循环内拟合一条线

Question

我正在尝试以特定格式（使用 pdflatex！）编写一个双环费曼图，基本上是用一条线将两个环分成两半。不幸的是，虽然下图中的结果几乎符合我的预期，但垂直线与环相交，这让它看起来很混乱。有办法解决这个问题吗？或者更广泛地说，有没有更好的方法来实现这个图？

  \documentclass{article}
    \usepackage{tikz} 
    \usepackage{tikz-feynman} 
    \tikzfeynmanset{compat=1.1.0}
    \begin{document}
                \begin{tikzpicture}[layered layout,baseline]
                \begin{feynman}
                \vertex (a1);
                \vertex[right=2cm of a1] (a2);
                \vertex[above right= 2.12 cm of a2](a3);
                \vertex[below right= 2.12 cm of a2](a4);
                \vertex[below = 1 cm of a3] (a31);
                \vertex[above = 1 cm of a4] (a32);
                \vertex[right=3cm of a2] (a5); 
                \vertex[right=2cm of a5] (a6); 
                \diagram* {
                    (a1) -- [gluon] (a2)
                    (a2) -- [fermion,half left] (a5)
                    (a3) -- [gluon] (a31) -- [fermion] (a32) -- [gluon] (a4)
                    (a5) -- [fermion,half left] (a2)
                    (a5) -- [gluon] (a6)
                };
                \end{feynman}
                \end{tikzpicture}
    \end{document}

Answer 1

我会使用quarter lefts 并且不在胶子上放箭头，因为它会在真实表示中进行变换。

\documentclass{article}
\usepackage{tikz} 
\usetikzlibrary{positioning}
\usepackage{tikz-feynman} 
\tikzfeynmanset{compat=1.1.0}
\begin{document}
            \begin{tikzpicture}[layered layout,baseline]
            \begin{feynman}
            \vertex (a1);
            \vertex[right=2cm of a1] (a2);
            \vertex[above right= 2.12 cm of a2](a3);
            \vertex[below right= 2.12 cm of a2](a4);
            \vertex[below = 1 cm of a3] (a31);
            \vertex[above = 1 cm of a4] (a32);
            \vertex[right=3cm of a2] (a5); 
            \vertex[right=2cm of a5] (a6); 
            \diagram* {
            (a1) -- [gluon] (a2)
                -- [fermion, quarter left] (a3)
                -- [fermion, quarter left] (a5)
                -- [fermion, quarter left] (a4)
                -- [fermion, quarter left] (a2),
                (a5) -- [gluon] (a6),
                (a3) -- [gluon] (a4)        
            };
            \end{feynman}
            \end{tikzpicture}
\end{document}