更改乳胶箭头图中动量箭头的大小和位置

发布于 2025-01-31 16:55:05 字数 1377 浏览 3 评论 0原文

我正在为乳胶中的康普顿散射制作Feynman图。实际上有两个图。第一个还可以。该代码是：

\begin{tikzpicture}
  \begin{feynman}
    \diagram[horizontal=a to b] {
  i1 [particle=\(e^{-}\)] -- [fermion,momentum'=\(p_{i}\)] a -- [photon,reversed momentum'=\(k_{i}\)] f1 [particle=\(\gamma\)],
  a -- [fermion] b,
  i2 [particle=\(\gamma\)] -- [photon,reversed momentum'=\(k_{f}\)] b -- [fermion,momentum'=\(p_{f}\)] f2 [particle=\(e^{-}\)],
};
  \end{feynman}
\end{tikzpicture}

它导致： “第一个图”

现在，第二个图并不能很好。

代码为：

\begin{tikzpicture}
  \begin{feynman}
    \diagram[horizontal=a to b] {
      i1 [particle=\(p_{i}\)]
         -- [fermion,momentum'=\(p_{i}\)] a
         -- [draw=none] f1 [particle=\(\gamma\)],
      a -- [fermion, edge label'=\( \)] b,
      f2 [particle=\(\gamma\)]
         --  [draw=none] b
         -- [fermion,momentum'=\(p_{f}\)] i2 [particle=\(p_{f}\)],
    };
    \diagram* {
      (a) -- [photon,momentum'=\(k_{f}\)] (f2),
      (f1) -- [photon,,momentum'=\(k_{i}\)] (b),
    };
  \end{feynman}
\end{tikzpicture}

它导致： “二维”

我希望光子动量箭头在光子线上，而比它们短现在。我也希望它们是在光子线的开头而不是中间的。此图显示了我希望该图的外观。红线显示箭头应该在哪里。

欢迎任何帮助！谢谢

原文

I am making a Feynman diagram for Compton scattering in LaTeX. There are two diagrams actually. First one is ok. The code is:

\begin{tikzpicture}
  \begin{feynman}
    \diagram[horizontal=a to b] {
  i1 [particle=\(e^{-}\)] -- [fermion,momentum'=\(p_{i}\)] a -- [photon,reversed momentum'=\(k_{i}\)] f1 [particle=\(\gamma\)],
  a -- [fermion] b,
  i2 [particle=\(\gamma\)] -- [photon,reversed momentum'=\(k_{f}\)] b -- [fermion,momentum'=\(p_{f}\)] f2 [particle=\(e^{-}\)],
};
  \end{feynman}
\end{tikzpicture}

It results in:
First diagram

Now, the second diagram did not end up well.

Code is:

\begin{tikzpicture}
  \begin{feynman}
    \diagram[horizontal=a to b] {
      i1 [particle=\(p_{i}\)]
         -- [fermion,momentum'=\(p_{i}\)] a
         -- [draw=none] f1 [particle=\(\gamma\)],
      a -- [fermion, edge label'=\( \)] b,
      f2 [particle=\(\gamma\)]
         --  [draw=none] b
         -- [fermion,momentum'=\(p_{f}\)] i2 [particle=\(p_{f}\)],
    };
    \diagram* {
      (a) -- [photon,momentum'=\(k_{f}\)] (f2),
      (f1) -- [photon,,momentum'=\(k_{i}\)] (b),
    };
  \end{feynman}
\end{tikzpicture}

It results in: Second diagram

I want the photon momentum arrows to be above the photon lines, and shorter than they are now. I would also like them to be by the beginning of the photon line, not in the middle. This image shows approximately how I would want the diagram to look like. Red lines show where the arrows should be.
New image

Any help is welcome!
Thank you

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淡莣 2025-02-07 16:55:05

% !TeX TS-program = lualatex
\documentclass{article}

\usepackage{tikz-feynman}

\begin{document}

\begin{tikzpicture}
  \begin{feynman}
    \diagram[horizontal=a to b] {
      i1 [particle=\(p_{i}\)]
         -- [fermion,momentum'=\(p_{i}\)] a
         -- [draw=none] f1 [particle=\(\gamma\)],
      a -- [fermion, edge label'=\( \)] b,
      f2 [particle=\(\gamma\)]
         --  [draw=none] b
         -- [fermion,momentum'=\(p_{f}\)] i2 [particle=\(p_{f}\)],
    };
    \diagram* {
      (a) -- [
                photon,
                momentum={[
                  arrow shorten=0.25, 
                  xshift=4mm,
                  yshift=2mm
                ]$k_{f}$}
              ] (f2),
      (f1) -- [
                photon,
                momentum={[
                  arrow shorten=0.25,
                  xshift=-4mm,
                  yshift=2mm
                ]$k_{i}$}
              ] (b),
    };
  \end{feynman}
\end{tikzpicture}

\end{document}

% !TeX TS-program = lualatex
\documentclass{article}

\usepackage{tikz-feynman}

\begin{document}

\begin{tikzpicture}
  \begin{feynman}
    \diagram[horizontal=a to b] {
      i1 [particle=\(p_{i}\)]
         -- [fermion,momentum'=\(p_{i}\)] a
         -- [draw=none] f1 [particle=\(\gamma\)],
      a -- [fermion, edge label'=\( \)] b,
      f2 [particle=\(\gamma\)]
         --  [draw=none] b
         -- [fermion,momentum'=\(p_{f}\)] i2 [particle=\(p_{f}\)],
    };
    \diagram* {
      (a) -- [
                photon,
                momentum={[
                  arrow shorten=0.25, 
                  xshift=4mm,
                  yshift=2mm
                ]$k_{f}$}
              ] (f2),
      (f1) -- [
                photon,
                momentum={[
                  arrow shorten=0.25,
                  xshift=-4mm,
                  yshift=2mm
                ]$k_{i}$}
              ] (b),
    };
  \end{feynman}
\end{tikzpicture}

\end{document}