\documentclass[uplatex,a4j,10pt]{jsarticle}
\usepackage{fancybox,boxedminipage,ascmac}
\usepackage{amsmath,amsthm,amssymb,bm}
\usepackage{amsfonts,amscd,mathrsfs}
\usepackage{cases,physics}
\usepackage[dvipdfmx]{graphicx}
\usepackage[all]{xy}
\usepackage{tikz,tikz-cd}
\usetikzlibrary{shadows}
\usepackage{multicol}
\usepackage[version=3]{mhchem}
\usepackage{tcolorbox}
\tcbuselibrary{raster,skins}
\usepackage[compat=1.1.0]{tikz-feynhand}
%\usepackage{tikz-feynman}
%\tikzfeynmanset{compat=1.1.0}
\renewcommand{\labelenumi}{[\ \arabic{enumi}\ ]\ \ }
\setlength{\textwidth}{15cm}
\setlength{\oddsidemargin}{-1.0cm}
\setlength{\evensidemargin}{-1.0cm}
\setlength{\topmargin}{-2cm}
\setlength{\textheight}{24cm}
\begin{document}
\begin{center}
\textbf{tikz-feynman の使い方}\ (2020/07/12) \\
\end{center}
\begin{align*}
\int dx\; f(x) = \alpha
\begin{tikzpicture}[baseline=(o.base)]
\begin{feynhand}
\vertex (a) at (-1,-1); \vertex (b) at (1,-1); \vertex (c) at (0,1);
\vertex [dot, blue] (o) at (0,0) {}; \propag [fermion, blue] (a) to (o);
\propag [anti fermion, blue] (b) to (o); \propag [fermion, blue] (c) to (o);
\end{feynhand}
\end{tikzpicture}
- 2i\,e
\begin{tikzpicture}[baseline=-0.3cm]
\begin{feynhand}
\vertex (a) at (-1,-1); \vertex (b) at (1,-1); \vertex (c) at (0,1);
\vertex [dot, orange] (o) at (0,0) {};
\propag [photon, orange] (a) to (o);
\propag [photon, orange] (b) to (o);
\propag [photon, orange] (c) to (o);
\end{feynhand}
\end{tikzpicture}
\end{align*}
\vspace{1cm}
\begin{center}
\begin{tikzpicture}
\begin{feynhand}
\vertex [particle] (a) at (0,0) {e$^-$};
\vertex [dot] (b) at (2,0) {};
\vertex (c1) at (4,0.5);
\vertex (c2) at (4,-0.5);
\propag [fer] (a) to (b);
\propag [chasca] (b) to (c1);
\propag [chabos] (b) to (c2);
\end{feynhand}
\end{tikzpicture}
\end{center}
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