cms-sw/cmssw — pull request #277 by kknb1056 (2013-08-09 15:42:11+00:00)
Title: Fix bug where pileup TrackingParticles are given the wrong initial vertex position

Fix to the old deprecated TrackingTruthProducer. Bug shows up as a falsely improved dz resolution. TrackingParticles are given their initial position from a SimVertex, but the array indexing doesn't take account of which crossing the SimVertex is in. Consequently pileup TrackingParticles are given a position from a random SimVertex in the signal crossing.