

\subsection{\bf A Monte Carlo Event}

\begin{slide}
\begin{itemize}
\item We call the resultant point ``an event'' in analogy to what
happens in real world.  Monte Carlo Integrals are ``just''
averages over events.  Call

\begin{description}
\item{$\bullet$} ``$f$'' = Cross-section to produce Higgs
\item{$\bullet$} ``$g$'' = Particles interacting with experimental
detector.
\end{description}

\item In the real world, each event has ``unit weight'' (God does
perfect importance sampling).  

\item In the Monte Carlo,
\begin{description}
\item{$\bullet$} $g$ is typically 0 or 1, as it is in real world,
\item{$\bullet$} $f$ is a widely varying function reflecting
theoretical expectation (model).
\end{description}

\item Calculating $g$ is very time consuming as need to track many
(100's at SSC) particles through apparatus.

\item Also, one typically has several different $g$'s to calculate for
each $f$.

\item These different $g$'s are the responses of different parts of
apparatus.
\end{itemize}
\end{slide}

