Changes between Version 5 and Version 6 of WorkBook/PileUp
- Timestamp:
- Mar 6, 2013, 11:34:38 AM (12 years ago)
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WorkBook/PileUp
v5 v6 8 8 === Mixing pile-up === 9 9 10 The mixing procedure is done via the "PileUpMerger" module. The user can specify 4 parameters: PileUpFile, MeanPileUp, ZVertexWidth, ZVertexResolution.10 The mixing procedure is done via the {{{PileUpMerger}}} module. The user can specify 4 parameters: {{{PileUpFile}}}, {{{MeanPileUp}}}, {{{ZVertexWidth}}}, {{{ZVertexResolution}}}. 11 11 12 * PileUpFile:12 * {{{PileUpFile}}}: 13 13 14 14 the event sample containing pile-up events in binary format. This format allows for faster random event access compared to root trees. Basic information about the event is contained (particle 4-momenta, vertex position, and Particle ID) … … 16 16 This sample has to be generated in advance with an event generator (typically Pythia6/8 or HERWIG) and then converted into binary format. 17 17 18 * MeanPileUp:18 * {{{MeanPileUp}}}: 19 19 20 20 the average amount of pile-up events per bunch-crossing. For each hard scattering, N pile-up events will be randomly chosen from the PileUp file, where N is a random number following Poisson statistics with a mean MeanPileUp. 21 21 22 * ZVertexWidth:22 * {{{ZVertexWidth}}}: 23 23 24 24 Pile-up events randomly populate the z-axis. The position of each pile-up event is generated from a gaussian distribution with a standard deviation ZveterxWidth. 25 25 26 * ZVertexResolution26 * {{{ZVertexResolution}}} 27 27 28 28 For |z|< ZVertexResolution the hard interaction vertex cannot be distinguished from pile-up vertices. For such pile-up events both charged and neutrals are then merged in the event (no charged particle subtraction).