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Advance in ATLAS Calorimeter Commissioning: Ideas and Challenges

Explore ideas for commissioning ATLAS calorimeter with focus on timing, calibration uniformity, positioning accuracy, and energy corrections. Discuss strategies for handling hard brem, beam-gas interactions, and machine backgrounds. Evaluate methods for track association and ID alignment. Consider future prospects like J/psi scale electrons and Z-->ee/mumu plus gamma for photons. Emphasize robust algorithms along with intricate tools. Utilize CBTB tools for comprehensive analysis and material studies.

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Advance in ATLAS Calorimeter Commissioning: Ideas and Challenges

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  1. egamma Ideas for Commissioning Philippe Schwemling and Dirk Zerwas LPNHE Paris and LAL Orsay July 20, 2004 • Precollision data (see Commissioning talks by L. Serin and N. Benekos in Sept. 2003) : • Barrel • timing of Calorimeter about 1ns F/M • check uniformity of calibration 0.5% (difference Cal/physics with 40k) • positioning of barrel about 0.5mm (eta and phi) • study with CBTB data positioning • ID alignment • no obvious use for egamma directly • hard brem/beam-gas • relative timing/dead cells (muons not everywhere available with high stat.) • with good simulation, possibly energy scale (H1, Witek Krasny)

  2. First true Collisions: • Xcheck timing (inclusive EM, back sampling) • timing difference back-to-back regions (ECA-ECC) • to Xcheck long iteraction point position cm-precision • average ET of minimum-bias as function of eta, phi • for HV regions for Calo and Trigger • Start to understand machine bg (timing, energy, angle…) • try to find Z->ee • first only on EM-Clusters • Z mass as function of eta • important HV corrections in EC • track association (efficiency), ID alignment important • Energy corrections in egamma (Paris WS): • phi, eta modulation • longitudinal weights • other corrections • Position corrections • phioffset • S-shape Strips and Middle sampling • More ambitious (far future): • J/psi as lower energy scale electrons • Z->ee/mumu + gamma for photons? • Iterations will be necessary!

  3. How? • CBTB provides much of the tools and the testbed also with older TB data • make sure that aside from intricate tools and corrections • also robust simple algs are available (e.g. 3x3 for TB, log position weighting) • TB analysis (responsability of TB-Co) in ATHENA • electrons/photons (response, shower shapes etc) • material studies • bremfit etc • compare to CBT MC • transferred to ATLAS simulation • for some things (hard brem) need to rely on MC alone • Simulation (partially produced) • Corrections are energy and particle dependent • 400k photons E=20GeV, 50GeV, 100GeV • 400k electrons/positrons E=50GeV , 100GeV • Energy/identification/jet rejection (low luminosity) • E=5, 10, 25, 75, 200, 500, 1000GeV • 40k photons • 40k electrons and positrons • Testbeam connection • Pi0 ET=50GeV w/o pileup • photons ET=50GeV w/o pileup

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