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如何在 TikZ-Feynman 中调整动量箭头

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如何在 TikZ-Feynman 中调整动量箭头

我正在尝试使用 Latex 中的 TikZ-Feynman 包创建 Feynman-Diagra。

有没有办法调整 TikZ 中动量箭头的位置？目前，光子线的两个动量箭头在图中重叠，看起来不太好看。我想让动量箭头更靠近光子线的边缘。我该怎么做？

\begin{tikzpicture}
    \begin{feynman}
    \diagram [baseline={(current bounding box.center)},vertical'=a to b] { 
      i1[particle=\(e^{-}\)] -- [anti fermion, rmomentum'={[arrow style=white,label style=black]\(p^\prime\)}] 
      a -- [draw=none] 
      f1[nudge=(-45:0.5cm),particle=\(\gamma\)], 
      a -- [anti fermion, rmomentum'={[arrow style=white,label style=black]\(p-k^\prime\)}] b,
      i2[particle=\(e^{-}\)] -- [fermion,rmomentum={[arrow style=white,label style=black]\(p\)}] 
      b -- [draw=none]
      f2[nudge=(45:0.5cm), particle=\(\gamma\)], };
      \diagram* {
        (a) -- [photon,rmomentum={[arrow shorten=0.15mm,arrow distance=3mm]\(k\)}] (f2),
        (b) -- [photon,momentum'={[arrow shorten=0.15mm,arrow distance=3mm]\(k\)}] (f1),
      };
    \end{feynman}
\end{tikzpicture}

在此处输入图片描述

答案1

我觉得有点拖延，所以就开始吧。

如果你用宏手动定义坐标，这很容易\vertex。（见第 2.4.3 节手动放置请参阅手册中的说明，以供参考。）

代码输出

\documentclass{article}
\usepackage[compat=1.1.0]{tikz-feynman}
\begin{document}   
\begin{tikzpicture}[
  arrowlabel/.style={
    /tikzfeynman/momentum/.cd, % means that the following keys are read from the /tikzfeynman/momentum family
    arrow shorten=#1,arrow distance=1.5mm
  },
  arrowlabel/.default=0.4
]
\begin{scope}[local bounding box=part A]
\begin{feynman}
% first define the coordinates
\vertex (a);
\vertex [right=of a] (b1);
\vertex [above=1cm of b1] (b2);
\vertex [above=1cm of b2] (b3);
\vertex [above=1cm of b3] (b4);
\vertex [right=of b4] (c);

% then draw connections
\diagram* {
  (a) -- [boson, momentum={[arrowlabel]$k$}] (b2),
  (b1) -- [fermion, edge label'=$p$]   (b2)
       -- [fermion, edge label'=$p+k$] (b3) 
       -- [fermion, edge label=$p'$]   (b4),
  (b3) -- [boson, momentum'={[arrowlabel]$k'$}] (c),
};
\end{feynman}
\end{scope}

\node [right=3mm of part A] (plus) {$+$};

\begin{scope}[local bounding box=part B, shift={([xshift=3mm]plus.east |- part A.south)}]
\begin{feynman}
\vertex (a);
\vertex [right=of a] (b1);
\vertex [above=1cm of b1] (b2);
\vertex [above=1cm of b2] (b3);
\vertex [above=1cm of b3] (b4);
\vertex [right=of b4] (c);

\diagram* {
  (a) -- [boson, momentum={[arrowlabel=0.42]$k$}] (b3),
  (b1) -- [fermion, edge label'=$p$]   (b2)
       -- [fermion]                    (b3) 
       -- [fermion, edge label=$p'$]   (b4),
  (b2) -- [boson, momentum'={[arrowlabel=0.42]$k'$}] (c),
};
\end{feynman}
\end{scope}
\end{tikzpicture}
\end{document}

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