  We have used ISAJET and the JAS LCD fast simulation to explore the precision
of Snowmass Point SPS1a selectron mass reconstruction for the Silicon Detector
concept. Simulating collisions at E_cm = 1 TeV, we have found that most of the
information constraining the selectron mass is carried in the forward
(|cos(theta)| > 0.8) region. We have also found that, for a beam energy spread
of 1% (conventional RF design), detector resolution limitations compromise the
selectron mass reconstruction only in the forward region. However, for a beam
energy spread of less than 0.2% (superconducting RF design), the detector
resolution compromises the selectron mass reconstruction over the full angular
region.
