Unregularized Propagator Diagrams

Edit and compile if you like:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
\documentclass[tikz]{standalone}
\usetikzlibrary{patterns}
\def\radius{1}
\begin{document}
\begin{tikzpicture}
  % Left diagram
  \draw[thick] (0,0) circle (\radius);
  \draw (-2*\radius,0) -- (-\radius,0) (\radius,0) -- (2*\radius,0);
  \draw[fill=white,postaction={pattern=north east lines}] (\radius,0) circle (0.25*\radius) node[above right] {$\Gamma_k^{(3)}$} (-\radius,0) circle (0.25*\radius) node[above left] {$\Gamma_k^{(3)}$};
  \node at (3*\radius,0) {$-$};
  % Right diagram
  \begin{scope}[xshift=160]
    \draw[thick] (0,0) circle (\radius);
    \draw (-2*\radius,-\radius) -- (2*\radius,-\radius);
    \draw[fill=white,postaction={pattern=north east lines}] (0,-\radius) circle (0.25*\radius) node[above=5pt] {$\Gamma_k^{(4)}$};
  \end{scope}
\end{tikzpicture}
\end{document}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX