Comments from MarlinReco users in Asia

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Presentation transcript:

Comments from MarlinReco users in Asia Taikan Suehara ICEPP, The Univ. of Tokyo

Topics Introduction of our work flow ROOT issues Other LCIO/Marlin/DST issues Future collaboration

Original proc. in Marlin Work flow in Asia Generator/ preselection Mokka Jupiter StdHep LCIO LCIO (w/converter) QuickSim (fast simulator) Reconstruction in Marlin/MarlinReco DST DST Original proc. in Marlin MARS (DST-JSF interface) ROOT tree JSF internal JSF internal Analysis in ROOT Analysis in JSF Tokyo procedure Tau-pair SUSY point5 (w/DESY) Jet clustering development KEK/Tohoku procedure Higgs / Top ZHH / ttH / Little higgs etc. in QuickSim Strip clustering

Tokyo analysis flow in detail TAU SUSY point5 DST DST Tau clustering BCalTagEfficiency TauProcessor Precuts Fill ROOT trees 1cfit-proc Precuts Kinematic fit Fill ROOT trees Marlin Marlin Many (~15000) small .root files contains cluster 4-momentum, charge, MC info, cut variables, whizard ID etc. in each tree DESY analysis hadd hadd Share trees Combined file (1 - a few) Analysis with ROOT macros (event weighting, obtain plots/numbers)

Issues on current analysis flow Many trivial work concerning LCIO in the Marlin processor No built-in 3- and 4- vector classes 1-by-1 copy from LCIO to ROOT tree Event weighting is performed in the analysis level – should be standardized? Original scripts which modifies steering file and run Marlin are needed – also should be standardized? Virtually everyone uses ROOT, so ROOT-friendliness is very important.

Proposals for ROOT interoperability Two independent proposals: Add ROOT-friendly LCIO interface and allow using it in Marlin. For Marlin processors Use of TVector3/TLorentzVector etc. as the interface to LCIO parameters Implement an easy conversion processor from LCIO to ROOT trees. For off-Marlin analysis Specification of the trees can be fixed or determined by Marlin parameters Both can be done without critical change of LCIO/Marlin framework.

Miscellaneous issues LCIO Marlin/MarlinReco/DST (Shallow) copy of ReconstructedParticle etc. Polarization in MCParticle Event-ID numbering Marlin/MarlinReco/DST Command line modification of Marlin parameters JSF has the feature. Eg. Marlin hoge.xml --/global/SkipNEvents=1000 Lepton + jets clustering Slow lfc-ls in GRID: too many files in a directory

Contributions to Marlin framework Possible contributions from Asia: Tracking JetClustering/Vertexing/(Flavor tagging) Strip clustering PFA Generator/Preselection (StdHep output) Fast simulator (QuickSim) LCIO/ROOT interface …of course manpower is very limited…

The end