\relax \@writefile{toc}{\contentsline {section}{\numberline {1}Introduction}{1}} \@writefile{toc}{\contentsline {section}{\numberline {2}The Mandelstam Variables}{1}} \newlabel{eq:studef}{{2}{1}} \@writefile{lof}{\contentsline {figure}{\numberline {1}{\ignorespaces Definition of particles involved in the scattering process. }}{2}} \newlabel{fig:abcdelsct}{{1}{2}} \@writefile{lof}{\contentsline {figure}{\numberline {2}{\ignorespaces The figure shows the valid regions of phase space allowed by energy and momentum conservation. }}{2}} \newlabel{fig:stualwd}{{2}{2}} \@writefile{toc}{\contentsline {section}{\numberline {3}The \ensuremath {e^+}\ensuremath {e^-}, \ensuremath {e^-} \ensuremath {e^-} Scattering Amplitude}{3}}