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Calibration hits in Jets

Calibration hits in Jets. A proposal for a package analyzing calibration hits inside reconstructed jets. Pierre–Antoine Delsart Mohsen Kharzad & Rachid Mazini. Package Overview. Results from the code being written for forward jets analysis Quite generic thanks to back navigation

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Calibration hits in Jets

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  1. Calibration hits in Jets A proposal for a package analyzing calibration hits inside reconstructed jets Pierre–Antoine Delsart Mohsen Kharzad & Rachid Mazini

  2. Package Overview • Results from the code being written for forward jets analysis • Quite generic thanks to back navigation ⇒ can be useful to others • Consists of one simple analysis algorithm It uses fully simulated events with calibration hits, produces an ntuple & associates to each jet : • Sum of energy of the hits inside the jets • An array corresponding to some calorimeter bins holding the jet energy deposition in each bin This for each 'type' of energy (G4 Total, G4 visible, etc...) Calo is divided in : • geometric region (Barrel, Tile, HEC,...) • Energy density bins (1 or 16) as in current hadronic calibration

  3. Package Details - Inputs It requires ESD files containing CaloCellContainers filled with Calibration hits. Simulation with calibration hits Reconstruction + CalibHitToCaloCell algo Digitization + keep calib hits - Add jobOption : “CalibHit_joboption.py” - May add 'topo jets' Add this line in jobOption : Stream1.ItemList+=["CaloCalibrationHitContainer#*"] ESD file

  4. Package Details - algo In each event, for each jet : NonEm Energy Jets Visible Energy G4 CaloCellContainer Total Energy back navigation G4 cells reco cells IdentifierHash • E+=Ecell • Find and fill calo bin according to CaloSample and E density • Other convenient calculation...

  5. Algorithm Output – Analysis script The algo produces an ntuple with jet related info : - Jet E, pT, eta, phi (for jets before and after calibration) - same for (eta,phi)-matched truth jet - G4 Total, visible, NonEm energy of the jet - array of calo bins in the form 'ZoneEnergy[njet][nbin]' for reco and all G4 energies - Radial energy profile of the jet The granularity of calo bins is quite fine (505 bins) : allows flexible analysis but information extraction is not immediate A ROOT script is provided : allows to easily convert the initial bin division into - Hadronic weight division - Calo Sample division - custom division ...

  6. Analysis examples (di-jet sample, E~1Tev, eta>3) Ratio E/Etruth in E density bins Total jet energy/ True jet energy distribution Reco/True G4 / True G4 total G4 Visible G4 non EM Reco Jets in HEC-FCAL crack Hadronic weight binning Ratio G4/Reco uncalibrated Calibration weights

  7. Work in progress – open questions • Dead Material hits information is being implemented in the algo : - by building a (eta,phi) distribution of DM energy - associating each jet to a (eta,phi) DM subregion • Currently having problems with cal hits in 10.0.4 (wrong Ids). Being fixed... If interest for this analysis algorithm, it is ready to be released as a pakage - New package (where ?) or add it to an existing package ? - Easy to re-implement it as an Athena tool or algo if prefered - Easy to extend it to any type of calorimeter object (back navigation) A test version is available here : /afs/cern.ch/user/d/delsart/publi/JetAnalysis.tar.gz Please email me for details (delsart at lps umontreal ca)

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