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PWG-DQ Experience and Requests

PWG-DQ Experience and Requests. Status of:. Muon based – analysis Central barrel - analysis. R. Arnaldi March 7 th 2012. Outline. 5 PAGs in PWG-DQ:. Jpsi2ee : J/  in the electron decay channel Jpsi2mumu : J/  in the dimuon decay channel

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PWG-DQ Experience and Requests

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  1. PWG-DQ Experience and Requests Status of: • Muon based – analysis • Central barrel - analysis R. Arnaldi March 7th 2012

  2. Outline • 5 PAGs in PWG-DQ: Jpsi2ee: J/ in the electron decay channel Jpsi2mumu: J/ in the dimuondecay channel LMee: Low mass in the electron decay channel LMmumu: Low mass in the dimuon decay channel Upsilon2mumu:  in the dimuon decay channel Many analysis on-going both on the 2010 and 2011 pp and PbPb data 2 published papers, 5 in preparation, based on 2010 data

  3. MUON analysis: PbPb2011 Focus on PbPb 2011 in view of the incoming Hard Probes conference Thanks for the special PbPb LHC11h pass1_MUON reconstruction!!! 5 days to have the full 2011 PbPb data ready for analysis (immediately after data taking)! Analysis are now proceeding very fast in view of the Hard Probes conference • Analysis of 2011PbPb data are based both on (Muon) AODs and ESDs • Several analysis done in parallel and results compared •  no discrepancy Muon AOD size extremely small  ~70Gb for all the PbPb 2011 useful for all Muon based analysis (134 runs)

  4. MUON Analysis: PbPb2011 (2) PbPb analysis are now based on AOD083 Hint of a rise for very central collisions (due to the chosen centrality anchor run)  solved with the new OADB (commit of 24/2/2012) To follow the centrality improvement, we will ask for a reprocessing of the AODs AOD083 Percentile V0M

  5. Embedding Pure J/ signal is embedded in a MB PbPb event (J. Castillo, C. Suire)  crucial ingredient to evaluate A x eff for the J/ RAA result (see arXiv:1202.1383) Checks on going Embedding soon needed also for the low mass analysis and for  studies

  6. Embedding (2) Some check plots: Centrality, Z vertex position and J/ peak are correctly reproduced in the embedding

  7. Analysis tools • PWG/muon/AliMuonTrackCutsand AliMuonPairCutsclasses used in several muon/dimuon analysis (D.Stocco) • Allow to apply a standard set of cuts on muon tracks or muon pairs. • As an example: • -4 <  < -2.5 • 2 < abs <10 degree • Match trigger (All pT/Low pT/High pT) • p x DCA cut  tuned period by period using the OADB • … Effects of PDCA cut. Important in the  region!

  8. Central barrel analysis: pp Jpsi2ee, LM2ee • Using already ESDs (mainly) and AODs • AOD analysis fully validated by comparing the results • Displaced J/analysis in pp is entirely done on filtered AODs (very small size sample)

  9. Central Barrel analysis: PbPb No special request for the moment: filtering is not significantly reducing file size Analysis feasible on both ESD and AODs Plan to join the legotrains, as it was done in the past, (after updating the dielectron framework)

  10. Conclusions Effort to finalize analysis in view of the incoming conferences (Hard Probes) Stable analysis framework. Tools prepared for 2010 analysis can be adapted to 2011 Almost all analysis can be run on ESD or AODs Fast Pass1 muon-devoted reconstruction was extremely useful!!! No major requests to the Offline 

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