Status of Reconstruction in 3.5 and 3.6 D. Lange, J-R Vlimant 7/05/09 PVT Meeting Vlimant 1
Outline ● Report on 3.5 cycle ● Report on 3.6 cycle ● Suggested plan for next reprocessing 7/05/09 PVT Meeting Vlimant 2
Feature list for 3.5 (1) https://twiki.cern.ch/twiki/bin/view/CMS/RecoTagSetDigest35X#Executive_Summary ● Cleaning of Hcal noise in particle flow (also in 3.4) ● Track Jets are added to the standard reconstruction. (also in 3.4) ● Better DT segment cleaning. ● CSC ME1/1a segments have less ghost. ● Muon identification with calorimeter compatibility is improved. ● Particle flow muons now contain pure tracker muon. ● Better identification of muon from segment compatibility. ● Hcal noisy rechit flaging. ● Better Zero Degree Calorimeter noise reduction. ● ZDC in rechits and digis in reco event content. ● Improved Ecal rechit noise flagging. ● Improved electron and photon identification. ● Castor reconstruction in default reconstruction. ● Castor rechit, tower, clusters, and jet in event content. 7/05/09 PVT Meeting Vlimant 3
Feature list for 3.5 (2) https://twiki.cern.ch/twiki/bin/view/CMS/RecoTagSetDigest35X#Executive_Summary ● dEdX is calculated without the pixel hits (also in 3.4) ● Better HO energy association to muon (also in 3.4). ● Better Hcal noise handling in MET (also in 3.4). ● Better beam halo identification (also in 3.4). ● Better Hcal rechit timing at low energy ● Calotower bad hit removal mechanism ● Ecal spike flagging and flagging infrastructure 3.5.6 * ● Particle flow nuclear interaction reconstruction ● Improved particle flow muon identification ● HF rechit cleaning 3.5.7 * ● Tuning of HF cleaning ● Updated software to use scaler beam-spot 3.5.8.patch3 * ● Protect all tracking seeding step to 10K seeds (*) not including the many big-fixes in the listing 7/05/09 PVT Meeting Vlimant 4
Processing with 3.5.8.patch3 ● Full reprocessing available https://twiki.cern.ch/twiki/bin/view/CMS/ReproRequest358patch3 2010 and 2009 data ● Running on Tier0 Using the scaler beam-spot (scaler ~ BeamSpot::type()=LHC) Pixel vertex not using the beam-spot constraint (inconsistent ?) Conservative tracking seeding regions (~40 cm in z) Loose PV reconstruction cuts (1 cm z-separation) Loose photon reconstruction (5 GeV instead of 10 GeV, ...) ➢ Still need completion of validation for high level reconstruction ➢ The two datasets are not as consistent as we would like them to be due to the beam-spot, but the effect is minor. 7/05/09 PVT Meeting Vlimant 5
Feature list for 3.6 (1) https://twiki.cern.ch/twiki/bin/view/CMS/RecoTagSetDigest36X#Executive_Summary ● CSC local reconstruction tuning ● Iterative tracking tuning ● Pixel vertexing clustering reduced to 1mm ● PV reconstruction improved ● Siscone 5 and 7 removed ● Jet-plus-track added ● Jet identification in HF ● HPS tau algorithm added ● Fixed cone tau algorithm removed ● Updated electron identification ● Improved information on soft lepton tagging ● Beam information ● Magnetic field value 7/05/09 PVT Meeting Vlimant 6
Feature list for 3.6 (2) https://twiki.cern.ch/twiki/bin/view/CMS/RecoTagSetDigest36X#Executive_Summary ● Added product for bTagging ● Tuning of the HF PMT cleaning ● Updated software to use scaler beam-spot 3.6.1 * ● Protect all tracking seeding step to 10K seeds ● Pixel error unpacking ● Possible next things for 3.6 cycle ➔ Bug-fixes ... ➔ Particle flow back port ➔ Pre-shower back port ➔ Tracking seeding adaptive thresholds ➔ Tracker cluster adaptive thresholds ➔ Use channel status in Ecal unpacking ➔ Updated track-jet algo ➔ ... (*) not including the many big-fixes in the listing 7/05/09 PVT Meeting Vlimant 7
Reprocessing with 3.6 (1) ● April 24 : https://twiki.cern.ch/twiki/bin/view/CMS/ReproRequest360 ➢ Configuration include Adapted PV loose configuration ✗ Did not succeed: 20% failures. ➢ Memory issues with tracking due to an evolution of the third step ● April 28 : https://twiki.cern.ch/twiki/bin/view/CMS/ReproRequest360Bis ➢ Configuration include tighter photon reconstruction electron reconstruction out-of-the-box Tuning of HF PMT cleaning ✔ Samples exist : 5% failures. ➢ Still memory issue with tracking 7/05/09 PVT Meeting Vlimant 8
Reprocessing with 3.6 (2) ● May 5 : https://twiki.cern.ch/twiki/bin/view/CMS/ReproRequest360patch2 ➢ Include Back-plane correction for strip local reconstruction Update SiStrip Lorentz-Angle conditions Updated strip gain conditions (not actually used) ✔ Sample exist ➢ Validated for tracking and Hcal ➢ Known issues with Ecal cleaning 7/05/09 PVT Meeting Vlimant 9
Reprocessing with 3.6 ● Next pre- reprocessing : 3.6.1 ➢ Include ✔ All addition to 3.6.1(see previous slides) ✔ Validated with previous pre-reprocessing Back-plane correction for strip local reconstruction Update SiStrip Lorentz-Angle conditions ✔ Pre-validated Updated strip gain calibration Updated tracker alignment Updated Ecal calibration ✗ To be pre-validated Updated muon alignment (alignment and APE) ➔ Not enough stat ➔ Would the reprocessing of the muon skim be useful ? ➔ Next valSkim (358patch3) will be enriched in muon Increase threshold on strip cluster ➔ Not easy to check for memory related crash 7/05/09 PVT Meeting Vlimant 10
Next Reprocessings ● Plan A: pre-reprocessing with 3.6.1 and new conditions towards production next week (see previous slide) ➢ Takes ~2 days ✔ Pros: validated by Monday, switching to production next week ✔ Cons: beam-spot payload next week to be validated ● Plan B : full reprocessing with 3.6.1 and no new conditions with respect to 3.6.0.patch2 reprocessing (?) ➢ Takes ~5 days for 99% of data ➢ Takes a bit more for skims to be made ✔ Pros: get a full dataset with 3.6.1 ✔ Cons: beam-spot payload and conditions to be integrated 7/05/09 PVT Meeting Vlimant 11
Summary ● 3.5.8.patch3 in production and good datasets available ● 3.6.1 in shape for reprocessing and production 7/05/09 PVT Meeting Vlimant 12
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