Example of drawing control regions with LaTeX using the TikZ package. For more related figures, please visit https://tikz.net/tag/categorization/.

decay_planes.tex

% Author: Izaak Neutelings (June, 2017)
 
\documentclass{article}
\usepackage{amsmath} % for \text
\usepackage{tikz}
\tikzset{>=latex} % for LaTeX arrow head
\definecolor{mylightred}{RGB}{255,200,200}
\definecolor{mylightblue}{RGB}{172,188,63}
\definecolor{mylightgreen}{RGB}{150,220,150}
 
% split figures into pages
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{1pt}%
 
\begin{document}
 
 
 
% CONTROL REGION: isolation
\begin{tikzpicture}[scale=6]
 
% define to change easily 
\def\isoe{0.15}
\def\isomu{0.20}
\def\isoSB{0.50}
\def\isomax{0.60}
 
% axes
\draw[->,thick]
  (0,0) -- (0,\isomax)
  node[at end,left=24pt,rotate=90] {muon isolation $I_\mu$};
\draw[->,thick]
  (0,0) -- (\isomax,0)
  node[at end,below=16pt,left] {electron isolation $I_\text{e}$};
 
% boxes
\draw[thick,fill=mylightgreen]
  (0,0) rectangle (\isoSB,\isoSB)
  node[anchor=north east] {SB};
\draw[thick,fill=mylightred]
  (0,0) rectangle (\isoe,\isomu)
  node[anchor=north east] {SR};
 
% labels
\draw
  (0,\isomu) node[anchor=east]  {\scriptsize$\isomu$}
  (0,\isoSB) node[anchor=east]  {\scriptsize$\isoSB$}
  (\isoe, 0) node[anchor=north] {\scriptsize$\isoe$}
  (\isoSB,0) node[anchor=north] {\scriptsize$\isoSB$};
 
\end{tikzpicture}
 
 
 
% CONTROL REGION: OS/SS
\begin{tikzpicture}[scale=4]
 
% axes
\draw[thick]
  (0,0) rectangle (1,1);
 
% dashed lines
\draw[dashed,thick]
  (0.5,-0.1) -- (0.5,1);
\draw[dashed,thick]
  (-0.1,0.5) -- (1,0.5);
 
% labels
\draw
  (0,0.75) node[anchor=east]  {OS}
  (0,0.25) node[anchor=east]  {SS}
  (0.25,0) node[anchor=north] {SR}
  (0.75,0) node[anchor=north] {SB};
\draw
  (0.25,0.75) node {QCD}  %{$\text{QCD}^\text{OS,SR}_\text{data}$}
  (0.75,0.25) node[text width=40,align=center] {QCD\\shape}; %{$\text{QCD}^\text{SS,SB}_\text{data}$};
 
% arrows
\begin{scope}[shift={(0.51,0.52)},scale=0.3]
    \draw[->,thick]
      (0.5,-0.5) -- (-0.5,0.5)
      node[midway, above=6pt, right=1pt] {\scriptsize$F$};
        %\frac{(\text{OS}/\text{SS})^\text{SR}_\text{sim}}
        %{(\text{OS}/\text{SS})^\text{SB}_\text{sim}}$};
\end{scope}
 
\end{tikzpicture}
 
 
 
\end{document}