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SFrame – an analysis framework

SFrame – an analysis framework. motivation: each analysis in HEP proceeds in cycles . each cycle: cycles over input events from different sources: e.g. “data” and various MC types a selection is done or new quantities are calculated

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SFrame – an analysis framework

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  1. SFrame – an analysis framework • motivation: • each analysis in HEP proceeds in cycles. • each cycle: • cycles over input events from different sources: e.g. “data” and various MC types • a selection is done or new quantities are calculated • output data are written for each selected event (trees) and validation histograms are filled • output of one cycle is input to next cycle • idea: set-up a generic analysis framework based on ROOT • history: • SFrame development started in the CERN Atlas Trigger group. • developers: S. Ask (CERN), N. Berger (CERN), T. Eifert (Geneva), J. Haller (Hamburg), A. Höcker (CERN) SFrame

  2. SFrame – schematic SFrame Histograms Histograms Histograms Histograms Histograms Histograms Histograms Histograms Histograms Histograms Histograms Histograms Histograms Histograms Histograms Cycle 2: e.g. TMVA selection, calculations Cycle 3: Selection, calculations Cycle 1: weighting selection, calculations … XML file: cycle structure, I/O information, meta-data: luminosities, generator cuts Root trees Root trees Root trees Root trees Root trees Root trees Root trees Root trees Root trees Root trees Root trees Root trees Root trees Root trees Root trees Root trees different lumis and different cuts on generator level ! Data AOD MC1 AOD MC2 AOD Some ROOT tree producing job, e.g. EventView MC3 AOD … MC4 AOD MC5 AOD SFrame

  3. SFrame - status • status: • basic version exists • still in the development phase !! • used by several analyses: • CERN, DESY, University Hamburg, University Manchester, … • Other groups arewelcome to use it and comment/ request/ implement additional functionality • more information: • SFrame TWiki athttps://twiki.cern.ch/twiki/bin/view/Main/SFramePage • CVS repository:/atlas/groups/catsusy/SFrame • disclaimer: SFrame only provides the framework: • I/O (controlled via XML file) • weighting of MC samples according to integrated luminosity, taken in to account possible cuts on generator level ! ). • loop execution (cycles, files, events) • filling of user-def. OO-trees and histos • book-keeping of histos. • (plotting: some generic macros) • user still has to provide: • input Root trees with meta-data (type, lumi, cuts) in steering card (XML) • implementation of cycles (full the C++ template for ExecuteEvent() method), incl. validation histograms • definition of output trees. SFrame

  4. Quick ATLAS analysis using SFrame: Di-leptons in SUSY • ROOT tree files from SUSYView, i.e.“standard” EventView particle ID • tree tailored for di-lepton study • produced test samples to debug analysis frame work • samples based on CSC11, but only small statistics: • SU3 (sample 5402-5403, v11000505) • Zee (sample 5144, v11004201) • T1 (sample 5200, v11004204) • selection: • e+ e- with pT >10GeV and |η|<2.5 • note: no cut on Meff or ET,miss many samples missing! QCD jets, T2 jets, W/Z+jets , SU2, …produced meanwhile, but not yet included in nice plots. masses in SU3 m(c01) 116 GeV m(c02) 223 GeV m(c03) 460 GeV m(eR) 157 GeV Dxy = m(c0x) - m(c0y) Invariant mass Meff ~ D12: 107 GeV c02 l- l+  c01 l- l+ SFrame

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