The initial study for a Pixel prototype (patch) was done in MathCAD by Howard Wieman.
The goal was set to measure D cross section (flow and high-pt suppression seemed unrealistic for a
short run/life-time device). To that end one aims to catch the mean-pt region, ie around 1 GeV in pt.

The study is here:
www-rnc.lbl.gov/~wieman/D_efficiency.htm which was updated, for comparison to GEANT purposes, to this: www-rnc.lbl.gov/~wieman/D_efficiency_2.htm and later updated to this:
www-rnc.lbl.gov/~wieman/D_efficiency_3.htm
WARNING: These pages require IE or Safari to be viewed and played properly.
A pdf version is also attached (no .avi movies though) for universal viewing.

A GEANT simulation with some less ideal situation can be found here:
www.star.bnl.gov/protected/strange/margetis/hft/patch3.pdf