
\documentclass[border=5pt,multi=true]{standalone}
\usepackage{standalone}
\usepackage{ifthen}
\usepackage{microtype}
\usepackage{lineno}
\usepackage{xspace}
\usepackage{caption}
\usepackage{graphicx}
\usepackage{color}
\usepackage{colortbl}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{amsfonts}
\usepackage{upgreek}
\usepackage{hyperref}
\usepackage{hypcap}
\usepackage{cite}
\usepackage{mciteplus}
\usepackage{longtable}
\usepackage{mathtools}
\usepackage{rotating}
\usepackage{graphpap}
\usepackage{multirow}
\usepackage{mathrsfs}
\usepackage{pifont}
\usepackage{cancel}
\usepackage{afterpage}
\usepackage{pdflscape}


\graphicspath{{./figs/}}

\begin{document}
\DeclareGraphicsExtensions{.pdf}
\setlength{\unitlength}{1mm}
  \centering
  \begin{picture}(150,60)
    \put(  0,  0){ 
      \includegraphics*[width=75mm,height=60mm,%
      ]{Fig1a.pdf}
    }
    \put( 75,  0){ 
      \includegraphics*[width=75mm,height=60mm,%
      ]{Fig1b.pdf}
    }
    \put( 32, 45) { \small { {$\begin{array}{l}\mbox{LHCb}\xspace~\ensuremath{\sqrt{s}}\xspace=7\ensuremath{\mathrm{\,Te\kern -0.1em V}}\xspace \\ 3<\ensuremath{p_{\mathrm T}}\xspace<4\ensuremath{{\mathrm{\,Ge\kern -0.1em V\!/}c}}\xspace \\ 3.0<y<3.5\end{array}$}}}
    \put(106, 45) { \small { {$\begin{array}{l}\mbox{LHCb}\xspace~\ensuremath{\sqrt{s}}\xspace=8\ensuremath{\mathrm{\,Te\kern -0.1em V}}\xspace \\ 3<\ensuremath{p_{\mathrm T}}\xspace<4\ensuremath{{\mathrm{\,Ge\kern -0.1em V\!/}c}}\xspace \\ 3.0<y<3.5\end{array}$}}}
    \put(  2, 14) { \begin{sideways}Candidates/(10\ensuremath{{\mathrm{\,Me\kern -0.1em V\!/}c^2}}\xspace)\end{sideways}}
    \put( 77, 14) { \begin{sideways}Candidates/(10\ensuremath{{\mathrm{\,Me\kern -0.1em V\!/}c^2}}\xspace)\end{sideways}}
    \put( 38,  2) { $m_{\ensuremath{\ensuremath{\mu}\xspace^+\ensuremath{\mu}\xspace^-}\xspace}$}  \put( 57.5,2) { $\left[\!\ensuremath{{\mathrm{\,Ge\kern -0.1em V\!/}c^2}}\xspace\right]$ }
    \put(113,  2) { $m_{\ensuremath{\ensuremath{\mu}\xspace^+\ensuremath{\mu}\xspace^-}\xspace}$}  \put(132.5,2) { $\left[\!\ensuremath{{\mathrm{\,Ge\kern -0.1em V\!/}c^2}}\xspace\right]$}  
  \end{picture}
\end{document}
