Impact Parameter Distributions at Primary Vertex

A. C. Saulys


Using the DEV version of library

Using my version of library and the Kalman filter for globtrk

Using my version of library and a constrained fit at primary vertex

From this VERY PRELIMINARY study, I conclude that cutting on the chisquare is a very good selection criterion for primary tracks. The advantage in using this type of cut is that it is momentum independent, where the impact distribution itself is not as shown in the previous plots above.

Last modified on Feb 15, 2000