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EMCal PPR Group 4 – Electrons/Heavy Flavor-Jets

EMCal PPR Group 4 – Electrons/Heavy Flavor-Jets. Coordinators: J.Klay (Calpoly), K.Read (Tennessee), M. Heinz (Yale). Group Members: Josh Hamblen & Irakli Martashvili (Tennessee) Udara Abeysekara (Creighton) Alberto Lozea (USP-Sao Paolo) Brandon Boswell & Christopher Brown (Cal Poly)

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EMCal PPR Group 4 – Electrons/Heavy Flavor-Jets

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  1. EMCal PPR Group 4 – Electrons/Heavy Flavor-Jets Coordinators:J.Klay (Calpoly), K.Read (Tennessee), M. Heinz (Yale) Group Members: • Josh Hamblen & Irakli Martashvili (Tennessee) • Udara Abeysekara (Creighton) • Alberto Lozea (USP-Sao Paolo) • Brandon Boswell & Christopher Brown (Cal Poly) • Per Thomas Hille & Student (Yale) • Mauro Cosentino (Campinas) Weekly EVO meetings organized by Ken: Thursdays 11:00am EDT C.) Electron and heavy flavor jet reconstruction • Electron reconstruction • Electron-jet reconstruction • Heavy quark energy loss • Heavy quark fragmentation functions

  2. Heavy quark tagging with electrons • Show electron to heavy meson correspondence in AA collisions. • Optimize e/h discrimination • Simulate signed DCA method for B-mesons • Direct reconstruction of high pT J/

  3. Issues and Updates • Electron dE/dx cut • AliEn/GRID • Software • Track-matching bug • PWG4 • B-jet simulations • Plans

  4. Electron ID with dE/dx cut • Joern suggested at LBL meeting to look at dE/dx cut for matched tracks when identifying electrons (a la STAR) dE/dx > 70 Single e: All matched tracks PYTHIA: All matched tracks Single e: MC PDG = e PYTHIA: MC PDG = e

  5. AliEn/GRID • Since April LBL Meeting • We learned that GRID productions unusable • Committed new track-matching parameters • Continued testing software for running large-scale jobs on grid • Current Status • Migrated to PWG4 and ALICE Analysis framework • Ken Read put together completely working, documented example at /afs/cern.ch/users/k/kread/public/all • Ready to validate productions

  6. Track-matching bug • Committed new track-matching parameters after LBL meeting • Subsequent testing indicated a problem • All matches marked as “fake” during reconstruction, thus no matched tracks assigned to clusters • “Fake” means MC label of track != MC label of cluster • Two different methods for matching exist • AliESDtrack + AliESDCaloCluster (post-reconstruction) • AliESDtrack + AliEMCALRecPoint (during reconstruction) • AliEMCALRecPoint->GetPrimaryIndex() was being used to get the MC label, but should have been AliEMCALRecPoint->GetParents() • Bug report and fix submitted to savannah (14-May-09) and patched to release by P. Hristov (15-May-09)

  7. PWG4 Analysis Code • As of 14-May-09 all PPR Group 4 members agreed to migrate to PWG4 analysis framework • Adheres to ALICE analysis framework • Provides much of functionality needed without duplicated effort • Cross-section weighting • JetFinder correlation integration • Interface to various data types • Example AliAnalysisTaskElectron provided to group members (JLK) • Ken Read adapted example to run in any of 5 modes: • Local, LocalCAF, PROOF, GRID, PLUGIN • Code tested, documented and available to everyone • /afs/cern.ch/users/k/kread/public/all

  8. B-Jet Simulations • Recently discovered requested update to AliGenPythia (Oct-08) was not included • Previous electron-jet GRID productions not optimized • Missing information • In order to correlate MC and reconstruction, need to save MC jet info (previously only done for Jet-Jet, -Jet) • Incorrect configuration • No call to check trigger conditions of requested b-jets • In order to improve efficiency, need to require electron with minimum pT in fiducial volume of EMCAL • Bug report and fixes submitted (14-May-09) with request for review • A. Morsch reviewed fix and responded to add process definition to AliPythia • Testing in progress, final fixes imminent

  9. Examples 50 > pThard > 60 pT(e) > 1 GeV in EMCAL

  10. Examples 50 > pThard > 60 pT(e) > 1 GeV in EMCAL

  11. Activities Matrix – group 4

  12. Plans • Added task to matrix: J/ ee in EMCAL (Mauro Cosentino) • Continue developing code within PWG4 framework • Working with HFE (heavy flavor electron) group led by Silvia Masciocchi from PWG3 to make sure we coordinate effort/don’t duplicate work • Analyze grid data when available • Produce final PPR plots

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