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EMC Software and analysis update

EMC Software and analysis update. Update on EMC News from last run Calibrations Status of data analysis Software update Offline software Online software Task list and service work. What worked during the last run. Towers About 100/2400 dead or noisy

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EMC Software and analysis update

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  1. EMC Software and analysis update • Update on EMC • News from last run • Calibrations • Status of data analysis • Software update • Offline software • Online software • Task list and service work Alexandre A. P. Suaide

  2. What worked during the last run • Towers • About 100/2400 dead or noisy • 1 bad digitizer board (32) channels (replaced) • 68 noisy/dead channels • HV is set to zero for all of them • SMD • 3/60 modules not working • Some individual channels • Some we know are dead • Zero pedestal and no readout • Some are noisy Alexandre A. P. Suaide

  3. Bad runs/days Weijiang Dong • About 138 bad runs • Thanks to Weijiang Dong • List at ~suaide/badruns/2003.h Alexandre A. P. Suaide

  4. Noise S. Trentalange • There is a correlated noise between towers very common to calorimeters • Pedestal distribution has a width ob ~25 GeV that can be easly reduced to ~5-6 GeV using standard comon noise subtraction methods • The Energy dynamic range of EMC is 2400 towers*60 GeV = 144 TeV • Noise at 1:104 level Alexandre A. P. Suaide

  5. BEMC Calibration • Detector is calibrated using MIP peak method • Electron calibration is under way Alexandre A. P. Suaide

  6. ET measurement in Au+Au collisions M. M. de Moura • Paper (PRC) being reviewed in the high-pT PWG Alexandre A. P. Suaide

  7. Electron identification in d+Au • Use TPC dE/dX to pre-select electrons in the range of 1.5 < p < 5.0 GeV/c (can extend a little more) • Compare TPC momentum with tower energy (p/Etower) Distance < 0.015 distance p/Etower p/Etower Alexandre A. P. Suaide

  8. Comparison with Au+Au • Electron peak is wider than Au+Au • Lower multiplicity in d+Au makes tower equalization more difficult -> working on it • Current tower resolution ~ 21%/sqrt(E) d+Au p/Etower Alexandre A. P. Suaide

  9. BOTH NO SMD Electron candidates Hadron candidates SMD-h SMD-f type Distance SMD-track The SMD can enhance e/h discrimination • SMD can help to discriminate electrons from hadrons • Most of hadrons do not have SMD clusters • The distance between SMD and track has different distributions Alexandre A. P. Suaide

  10. Single electron spectrum for HT d+Au collisions Preliminary (e+ + e- )/2 pT (GeV/c) Preliminary single electron spectra for d+Au collisions • 950 k High-tower events • No corrections applied • Trigger bias • Efficiency • background • Momentum resolution, etc • Need to tune up electron identification with EMC HT1 HT2 Alexandre A. P. Suaide

  11. p0 mass reconstruction in d+Au S. Trentalange and S. Guertin Alexandre A. P. Suaide

  12. p0 reconstruction in d+Au – SMD information S. Trentalange and S. Guertin • SMD is used to get the photon position • Need to understand efficiencies • Look how many EMC points at given energy have SMD info on it • Efficiency drops at lower energies because SMD thresholds are very high at reconstruction software • Need tune up Alexandre A. P. Suaide

  13. p0 spectrum in d+Au S. Trentalange and S. Guertin • Much work to be done • Efficiency corrections (embedding) • Cluster thresholds • This may have huge difference at high-pt because of the very small opening angle between photons Preliminary Alexandre A. P. Suaide

  14. Preliminary Df High tower azimuthal correlations S. Chattopadhyay, S. Voloshin and A. Suaide • Most of high tower triggered events with no tracks pointing to the tower come from p0´s • HT-track correlations and HT-HT correlations is a good way to study p0-track and p0-p0 correlations • It is possible to go very high in pT because of trigger • Very preliminary work. Need to compare to minimum bias track pT Alexandre A. P. Suaide

  15. EMC Software status • Offline reconstruction chain is fully implemented Alexandre A. P. Suaide

  16. EMC Database • Calibration and pedestals are filled in the database • Only MIP calibration for a while • Pedestals were saved every 12 hours during beam time • Status tables • Only one table with the bad towers/SMD channels in the beggining of the run • Bad runs at ~suaide/badruns/2003.h Alexandre A. P. Suaide

  17. EMC simulations and embedding • Slow simulator (PLEASE USE ONLY Y2003a GEOMETRY) • Real gains, pedestal and map of dead channels from database • Geometry propagation to .geant.root -> Is there any hope??? • Embedding (2 steps) • TPC embedding • EMC embedding Alexandre A. P. Suaide

  18. Online software – preparation for next run • Online calibration and pedestal measurement • Software is ready – Pedestal measurement, tower equalization and MIP calibration with L3 tracks • Need to tune up parameters • Multiplicity cuts, time interval for pedestal calculation • Event display • Ready to go • Online monitoring • EMC Monitoring – ready • STAR online monitoring (Panitkin’s) – ready • Need to check for possible changes in the trigger map and event pool library Alexandre A. P. Suaide

  19. Software summary – task list and service work • Simulations • Trigger simulator (very high priority) • Implementation of current High Tower and Patch algorithms • Signed but nothing has been done. NEED PEOPLE??? • Slow simulator (moderate priority) • Include simulation of correlated noise • Signed but nothing has been done. NEED PEOPLE??? • Embedding • Turn on EMC real data processing (very high priority) • Signed. Small problem with timestamp. Working on a solution • Test StEmcMixerMaker (very high priority) • DONE with simulation alone.Need to wait for previous item to be fixed Alexandre A. P. Suaide

  20. Software summary – task list and service work (cont.) • Calibration • Electron calibration (very high priority) • Under way. Working on better tower equalization • SMD calibration • NEED PEOPLE HERE • Database • Status tables (extremely high priority) • Map dead/bad towers and SMD channels • Time dependence of bad channels • NEED PEOPLE HERE • Online Software • Check software for next run (moderate priority) • Recompile with newer libraries • Check for possible changes in the event pool library and possible changes in the trigger maps • NEED PEOPLE HERE Alexandre A. P. Suaide

  21. Final comments • Data analysis is progressing very well (QM2004????) • ET paper being reviewed in the high-pT PWG • Single electron spectrum • p0 spectrum and correlations • Software development • All pieces in place • Task list • Offline -> Simulations, embedding, map dead channels, etc. • Online -> Need to prepare for next run • NEED VOLUNTEERS THAT ARE REALLY COMMITED TO HELP Alexandre A. P. Suaide

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