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SUMMARY DA and Shuttle OCDB RECONSTRUCTION SIMULATION ANALYSIS

ZDC offline code in Pb-Pb data taking. SUMMARY DA and Shuttle OCDB RECONSTRUCTION SIMULATION ANALYSIS. DAs and Shuttle. DA running at P2 for STANDALONE_PEDESTAL, STANDALONE_LASER, CALIBRATION_BC and PHYSICS run types

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SUMMARY DA and Shuttle OCDB RECONSTRUCTION SIMULATION ANALYSIS

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  1. ZDC offline code in Pb-Pb data taking • SUMMARY • DA and Shuttle • OCDB • RECONSTRUCTION • SIMULATION • ANALYSIS

  2. DAs and Shuttle • DA running at P2 for STANDALONE_PEDESTAL, STANDALONE_LASER, CALIBRATION_BC and PHYSICS run types • validated, installed at P2 but waiting for test session with DAQ people for CALIBRATION_EMD run type • CALIBRATION_EMD runs • standalone runs with L0 trigger given by ZDC (~12 bunch cross late) to trigger EM dissociation events • interest not only for ZDC energy calibration but also for physics of ultra-relativistic interactions (i.e., 1n emission x-section…) • first data taken with Pb circulating beams the past week • Shuttle failed for CALIBRATION_EMD runs since the DA is not properly producing output files retrieved by the Shuttle • waiting for DAQ people (we didn’t run CALIBRATION_EMD runs but at the very beginning of the Pb run even before STABLE BEAM declared by LHC) C. Oppedisano

  3. ZN energy calibration Single EMD event selection in physics runs(ZNA or ZNC) && !(ZEM1 or ZEM2) 1n and 2n peaks in low gain chain ADC (dual range) ZNC ZNA ZNC PMC ZNA PMC C. Oppedisano

  4. OCDB • ZDC OCDB entry that could be soon updated • ZDC/Calib/EnergyCalib • energy calibration coefficient calculated in CALIBRATION_EMD runs • all coefficients are currently set =1 as in pp • calculating offline energy calibration for neutron ZDCs • ZDC/Calib/MBCalib • MB distributions used to select centrality event by event during Pb-Pb data reconstruction • contains the output of the most recent simulations • need to be updated with correlations taken from data C. Oppedisano

  5. RECONSTRUCTION • MC • reconstruction correctly provides centrality estimations (Npart and b) • DATA • currently centrality variables provided by reconstruction are NOT reliable at all! • need to establish offline the centrality determination “golden rule” (i.e., use only of ZN or also of ZP signals…) • PROBLEM  calibration events in PHYSICS run makes use of default AliZDCRecoParam object which is the object for pp but the reconstruction is initialized for Pb-Pb! Therefore when the reconstructor tries to access data that are not even defined in pp recoparam object it crashes…Peter kindly offered to help me in finding a solution C. Oppedisano

  6. SIMULATION • Nspectator is taken from the generator • fragmentation algorithm is applied to extract the number of FREE (not bound in fragments) spectators • to consistently reduce the simulation speed it was long ago decided to store the signal given by a sample of 104 spectators in 2 files (1 for spectator n, 1 for spectator p) and then to add this event by event to the signal generated by participants • The signal is stored in different folders according to the CMS energy of the colliding system: 2760 or 5500 • This made the AliZDCDigitizer crash when the energy value retrieved by the GRP object was 3500… • Solved with the help of Andreas and Peter… C. Oppedisano

  7. SIMULATION vs. 1st DATA Nuclear fragment production model EZDC vs. EZEM PPR @ 5.5 TeV Expected maximum number of free neutrons ~60 EZNC+EZNA vs. ZEM signal EZNC vs. ZEM signal Maximum number of detected neutrons = 80/1380 ~ 57 !!! C. Oppedisano

  8. Pb-Pb DATA ZNC ZNA  Very narrow correlations between common PMT and tower PMTs, without events outside correlations as observed during pp run!  ZNC ZNA  No collimator shadowing, uniform particle distribution over ZN front face!  C. Oppedisano

  9. Savannah bugs & planner C. Oppedisano

  10. BACKUP SLIDES C. Oppedisano

  11. DATA NEEDED FROM GRP CALIBRATION (II) • Luminosity and collimator aperture values measured by machine luminometers (BRAN) can be very useful. (G. De Cataldo contacted.) • Already defined DP (to be archived): • dip/acc/LHC/Beam/LuminosityAverage/BRANB.4L2- dip/acc/LHC/Beam/LuminosityAverage/BRANB.4R2- dip/acc/LHC/Beam/LuminosityPerBunch/BRANB.4L2- dip/acc/LHC/Beam/LuminosityPerBunch/BRANB.4R2- dip/acc/Machine/CollimatorPosition/TCDD.4L2- dip/acc/Machine/CollimatorPosition/TDI.4L2- dip/acc/Machine/CollimatorPosition/TCTH.4L2.B1- dip/acc/Machine/CollimatorPosition/TCTH.4L2.B2DP to be defined and stored in archive:TCTV.4L2 TCTV.4R2 TCTVB TCLIA • Run types for which these DP should be retrieved by Shuttle preprocessor: • PHYSICS CALIBRATION_EMD • CALIBRATION_MB CALIBRATION_CENTRAL CALIBRATION_SEMICENTRAL • Still I don’t see any of them in the GRP preprocessor ? http://alisoft.cern.ch/viewvc/trunk/STEER/AliGRPPreprocessor.cxx?root=AliRoot&view=markup

  12. CALIBRATION (II) • Info in GRP • Luminosity and collimator apertures values measured by machine luminometers (BRAN) can be very useful. G. De Cataldo contacted. • Already defined DP (to be archived): • dip/acc/LHC/Beam/LuminosityAverage/BRANB.4L2- dip/acc/LHC/Beam/LuminosityAverage/BRANB.4R2- dip/acc/LHC/Beam/LuminosityPerBunch/BRANB.4L2- dip/acc/LHC/Beam/LuminosityPerBunch/BRANB.4R2- dip/acc/Machine/CollimatorPosition/TCDD.4L2- dip/acc/Machine/CollimatorPosition/TDI.4L2- dip/acc/Machine/CollimatorPosition/TCTH.4L2.B1- dip/acc/Machine/CollimatorPosition/TCTH.4L2.B2DP to be defined and stored in archive:TCTV.4L2 TCTV.4R2 TCTVB TCLIA • Run types for which these DP should be retrieved by Shuttle preprocessor: • PHYSICS STANDALONE_EMD

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