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EWK Dataset Distribution/Validation

EWK Dataset Distribution/Validation. Deprecated Summer08 datasets have been deleted from all T2 https://hypernews.cern.ch/HyperNews/CMS/get/ewk/201.html Datasets transferred to CIEMAT and Wisconsin since last EWK meeting https://hypernews.cern.ch/HyperNews/CMS/get/ewk/199/1.html

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EWK Dataset Distribution/Validation

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  1. EWK Dataset Distribution/Validation • Deprecated Summer08 datasets have been deleted from all T2 • https://hypernews.cern.ch/HyperNews/CMS/get/ewk/201.html • Datasets transferred to CIEMAT and Wisconsin since last EWK meeting • https://hypernews.cern.ch/HyperNews/CMS/get/ewk/199/1.html • https://hypernews.cern.ch/HyperNews/CMS/get/ewk/202.html • Standard validation jobs run over GEN-SIM-RECO, AOD-SIM • Validation jobs run locally at Wisconsin • Action item: Need to duplicate code in PAT for cross-validation 20 September 2014

  2. Duplicate Madgraph Events • “Large number of duplicates in Zjets-madgraph sample” (found by Dmytro Kovalskyi) • https://hypernews.cern.ch/HyperNews/CMS/get/generators/477.html • Possibly problems in merging but log files are lost • https://hypernews.cern.ch/HyperNews/CMS/get/generators/477/1.html • Brute force search over Madgraph (and other?) datasets looking for duplicate sets of events almost certainly required • Solution for future needed in central production 20 September 2014

  3. Another Madgraph Problem ... • Generator validation of VV->4l Madgraph gridpack shows several undesirable features which may (or may not) be common to all Madgraph production • https://hypernews.cern.ch/HyperNews/CMS/get/generators/443/2/2.html • W and Z mass distributions correlated with Pt • Some final state particles have extremely unphysical masses (e.g. tau mass > 100 GeV) • Very tight (+/- ~10 GeV) W and Z mass windows • Tight windows may be intrinsically necessary for Madgraph? • Problem which may be present in all Madgraph datasets is a bias in event selection based on the absolute numbers of jobs and events per job used in central production • Will produce high-statistics generator runs for all current Madgraph gridpacks to test this 20 September 2014

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