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Calibration Techniques for ECAL at 900 GeV: Key Findings from the February 2009 Meeting

This document outlines calibration procedures discussed during the Calorimeter meeting held on February 5, 2009, focusing on energy calibration for ECAL in the context of 900 GeV collisions. Various techniques for selecting clusters, energy ranges, and event characteristics are detailed, including the use of p0 reconstruction from separate Ecal clusters. The meeting emphasized the importance of low background selection, intercalibration accuracy, and strategies for refining calibration processes through iterative improvements. Resources for calibration tools and methodologies are provided.

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Calibration Techniques for ECAL at 900 GeV: Key Findings from the February 2009 Meeting

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  1. Calibration with p0 Work from Vanya Gaël Rospabé Phd Calorimeter meeting 5-2-09

  2. 100kevts, MinBias, 900GeV Cluster selection • Select p0 reconstructed from 2 separate Ecal clusters : • Energy range of g : up to 5-8 GeV • No charge track within the Ecal cluster • Pt g >300Mev/c • On minimum biais events signal with low background : • Associate electromagnetic cluster within 80 cm • PS >10MeV • Select g pairs within : • Average mass +- 2 s http://lappwiki01.in2p3.fr/LHCB-LAPP/index.php/Ecal_Calibration#Calibration_algorithm 900GeV Calorimeter meeting 5-2-09

  3. Calibration • Estimate the miscalibration • Select cell: Ecell >60% Ecluster • Fill correction factor histogram: • C = Mrec/mpi0 • N>200 evt • Calculate average • On the same events iterate . • To estimate : • Number of events / histogram • Number of iteration Calorimeter meeting 5-2-09

  4. 70/100evts S/B=5.2 Does it work in all the cases? • No tracking 900GeV • All clusters are combined • Higher background • Select low multiplicity events • #Clusters <20 • 14 TeV with tracking 900 GeV No tracking S/B = 3 0.80/100evts 14TeV 14TeV No tracking Calorimeter meeting 5-2-09

  5. Fond Fisher for g-id Profils longitudinaux : PS et Hcal Impacts dans le SPD Signal Profils transverses : Seed, S4Ecal et ECl Calorimeter meeting 5-2-09

  6. 14 TeV no tracking • After Fisher selection : • HLT independent • 1% intercalibration reached 14 TeV - tracking 30 /100evts S/B = 3 Worth waiting for tracking • # 0 per cell depend upon the initial calibration dispersion • Data taking at 2kHz Calorimeter meeting 5-2-09

  7. Tools available • Fisher tool : place or improvement .. • In absence of tracking , HCAL info reduce the combinatorial • Recalibration tools : • Selection • Correction average • Iteration • Stop procedure to improve. • http://lappwiki01.in2p3.fr/LHCB-LAPP/index.php/Ecal_Calibration#Calibration_algorithm • Gaël can be joined ( Annecy ) Calorimeter meeting 5-2-09

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