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Ecal Calibration Review and Updates 2012

Detailed overview of the 2012 Ecal Calibration processes, including fine calibrations, performance validations, and upcoming improvements in Calibration and CondDB status. Updates on pi0 mass trending, reconstruction parameters, and online reconstruction. Discussion on Radiative decays data analysis and impact of calibrations on signal resolution. Insights on event selection rates and expectations for future data processing. Guidelines for reprocessing data with the new Ecal calibrations and necessary steps for Calo reprocessing.

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Ecal Calibration Review and Updates 2012

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  1. Calorimetermeeting 2012/07/25 • Calibration & condDBstatus • O. Deschamps • LPC-Clermont-Fd 1

  2. 2012 Calibration • 2012 Ecal Calibration • Fine calibration performed on 7th-14th April and 8th-15th May data (Dasha) • Ageing correction on smaller interval (Marie-Noelle) • 23 intervals of validity from march to june TS • Slight adjustment of the γ/e reconstruction parameters (“α & β” parameters) • Performance validation on inclusive pi0s : Essentially recover 2011 performance

  3. 2012 Calibration • 2012 Ecal Calibration

  4. 2012 Calibration • 2012 Ecal Calibration • Pi0 mass trending per run • Pi0 mass trending per IOV

  5. 2012 Calibration • Online pi0 mass trending • Calorimeter standalone online reconstruction Online condDB update during TS Inner Middle ALL Outer

  6. 2012 Calibration • LED-based gain following over 14 monthes 2011 2012

  7. CondDB status • Latest LHCBCOND tag cond-20120710  contains • Ecal gain calibration up to June TS (Fine calibrations + ageing correction) • Reconstruction parametertuning • New parameters for Cluster covariance evaluation (were passed by options) • More to come • Alignmentsimilarto 2011 : likely no condDB update needed : see Philippe talk • CaloPIDreference (submitted by Dima & Victor last week) : see Victor talk • Todo • Re-evaluation of pile-up subtraction : beg. of august (?) • ImprovedPrsparametersbased on Oleg e/p method – impact to bestudied • Reprocessing deadlines from PAC (for data up to june TS)

  8. Radiative decays : first look at first 2012 data • 260 pb-1 (includingunchecked data set) • BEFORE Ecal calibration Broad & shifted signal peak

  9. Radiative decays : first look at first 2012 data • 460 pb-1 (includingunchecked data set) up to june TS • Reprocessedwith 2012 calibration M = 5365.9 MeV/c2 σ = 94.8 MeV/c2 2012 2012 M = 5277.1 MeV/c2 σ = 91.2 MeV/c2 2011 2011 M = 5280.6 MeV/c2 σ = 93.9 MeV/c2 M = 5359.9 MeV/c2 σ = 102.2 MeV/c2

  10. Radiative decays : first look at first 2012 data • 460 pb-1 (includingunchecked data set) up to june TS • Reprocessedwith 2012 calibration • 2012 signal resolution and peak position consistent with 2011 data • Selection rate (events/pb-1) • Bd→K*⁰γ : (5.3±0.2) (was 6.0±0.1 in 2011) 2012/2011 : (88±4)% • Bs→φγ : (0.80±0.05) (was 0.85±0.04 in 2011) 2012/2011 : (94±7)% • Expect ~+20% increase due to √s=7 TeV 8 TeV but L0-electron/photon • Et thresholdincreasedfrom 2.5 GeV to 2.72 GeV. • New Ecal calibration willbeapplied in reprocessing • In the meantime Calo reprocessingis possible in DV (>= v31r*) • DaVinci().CondDBtag = "cond-20120710" • DaVinci().DDDBtag = "head-20120413" • fromConfigurables import PhysConf • PhysConf().CaloReProcessing=True • + need to reprocessyourstripped candidates

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