As discussed above the main background for the tracking system analysis for
high mass states is from processes which result in a genuine slow track
through most of the apparatus.
For processes which
produce a proton with the ``right'' kinematics to fake a strangelet we have shown above
that the tracking system has a rejection of 1.94 
per collision.
To achieve the desired sensitivity for high masses
the calorimeter must supply further rejection of better than 
. Although this may seem
to be an ambitious requirement for the calorimeter, one should observe that to fake a high
mass particle, the apparent energy in the calorimeter which is matched with a fake high mass
candidate found by the tracking system must be many times greater than the
typical central nucleon energy.
For example, in order to fall within our timing window such a background track must be
necessarily ``slow'' ( 
, corresponding to
. Allowing for a maximum calorimeter timing error of 0.5
ns, the fastest accepted proton will deposit at most 2.4 GeV in the calorimeter.
In contrast, a 10 
strangelet with the same rapidity will
deposit 24 GeV in the calorimeter. The job of the calorimeter is to
distinguish, with high reliability, between these two possibilities. As might
be expected, the dominant process which can cause the
calorimeter to fail to make this discrimination is the accidental overlap of
several neutrons, in spatial and temporal coincidence (to within the
calorimeter resolution) with the tertiary proton track. We have performed a Monte
Carlo study of the calorimeter rejection with the result that the
calorimeter, as we propose to construct it, has more than adequate ability to
reject such background. We have also used this simulation to calculate the
efficiency for detecting calorimeter showers from high mass particles in the presence of
full central events.