Update in the Multiple Scattering description of the SFD detector in Geant-Dirac DIRAC NOTE 02-2016

nal track extrapolation to the target plane in the X and Y coordinates. The experimental error in the measurement of the tracks determines the width of the x = x2 x1 and y = y2 y1 which we call vertex resolution. We study the Vertex resolution as function of the total momentum of the track-pair. We can parametrise the distribution width of the two track impact points (in the target) as