How to specify this font in beamer?

How to specify the font used in the following figure in my beamer document? By the way, I am using XeLaTeX.

% !TEX program = xelatex
documentclass[]{beamer}

usepackage{xeCJK}
usepackage{fontspec}

usetheme{CambridgeUS} 
usecolortheme{beaver}
usefonttheme{serif}
%%%%%%%%%%%%%%%%%%%%
title[]{Font}
%%%%%%%%%%%%%%%%%%%%
begin{document}
maketitle
%%%%%%%%%%%%%%%%%%%%
begin{frame}{Transactional vs. non-transactional}
  begin{center}
    transactional vs. non-transactional
  end{center}
end{frame}
%%%%%%%%%%%%%%%%%%%%
end{document}
%%%%%%%%%%%%%%%%%%%%