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egamma Ideas for Commissioning

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

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egamma Ideas for Commissioning

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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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