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Update on the longitudinal shower profile Valeria Bartsch, University College London

Update on the longitudinal shower profile Valeria Bartsch, University College London. Event selection. gap correction energy range cut threshold value for ECAL / MIP double event cut Used the MARLIN processor by David Ward. 2006 -2007 comparison. all of David’s cuts incorporated

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Update on the longitudinal shower profile Valeria Bartsch, University College London

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  1. Update on the longitudinal shower profile Valeria Bartsch, University College London

  2. Event selection • gap correction • energy range cut • threshold value for ECAL / MIP • double event cut • Used the MARLIN processor by David Ward

  3. 2006 -2007 comparison • all of David’s cuts incorporated • electron profile quite different between 2007 and 2006

  4. effect of momentum smearing on the simulation Dp/p = √(C32 + C82) / 19.4mm [%] (C3 and C8 being collimator settings) Dp/p = 0.22% line in MOKKA steering (e.g. for 45 GeV): /gun/momentumSmearing 0.098GeV momentum smearing helps decreasing the discrepancy between MC and data

  5. Pion contaminationMichael Abraham tested over a range of 0-10% pion contamination. steady increase in Chi2 value as pion contamination is increased

  6. MWPC tracks Run 300207 all cuts plus MWPC cut Run 300207 No cuts except on MWPC • MWPC cut highly correlated to double event cut • plus reduces data and MC by 50% because of efficiency of MWPC

  7. simulation of air in front of testbeam setup slight improvement with David’s MC samples

  8. conclusion • new MC for 2007 needed for comparison • slight improvement in the MC simulation by incorporating momentum smearing, air before calorimeter • update on leakage energy comes soon

  9. leakage energy fractional longitudinal leakage energy vs beam energy

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