

\subsection{\bf A High Energy Experiment Scenario}

\begin{slide}
\begin{itemize}
\item Each particle is seen in a huge detector with some probability.

\centerline{\psfig{figure=ni.fig12.ps,clip=true,width=3.5in}}

\item Some particles miss apparatus.  Others hit chambers/bend into
magnets.

\item All ``multiple scatter''.  

\item Many produce secondary ``showers'' (i.e., final detection is a
``mess'').

\item Further theory is
\begin{description}
\item{$\bullet$} a) An approximation;
\item{$\bullet$} b) Hard to calculate.
\item{$\bullet$} However it is ``just'' an integral.
\end{description}
\end{itemize}
\end{slide}

