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In-situ calibration with Zee events

In-situ calibration with Zee events. Nikola Makovec Group meeting. Outline. CSC Note EG-6, section Intercalibration Motivation Data sample and event selection Description of the method The fitting method Reference distribution Method testing

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In-situ calibration with Zee events

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  1. In-situ calibration with Zee events Nikola Makovec Group meeting

  2. Outline • CSC Note EG-6, section Intercalibration • Motivation • Data sample and event selection • Description of the method • The fitting method • Reference distribution • Method testing • Results with misaligned and distorted geometry • Conclusion • 8 pages Nikola Makovec

  3. Motivation In situ calibration of the EM calorimeter with Zee events: • Intercalibration • Non-uniformities • Temperature • Purity • Extra-material in front of the calorimeter • Local constant term ~0.5% (=0.20.4) • Goal : 0.7% (TDR) • Intercalibrate these regions to a level of 0.4% • Absolute energy scale • Physics atlas program : ~0.1% • W mass measurement : ~0.02% Nikola Makovec

  4. Data sample and event selection • Data sample : • Trig1_misal1_csc11_V1.005144.PythiaZee.recon.NTUP.v12000601 • Studies at the generator level • Trig1_misal1_csc11_V1.005144.PythiaZee.recon.NTUP.v13003002 • Used after simulation and reconstruction • Event selection • at least electrons • The 2 leading should satisfy • pT>20GeV • ||<2.4 • IsEM(Medium)=true • 80<Mee<100 Nikola Makovec

  5. Description of the method (1) • Notation: • The fitting method: • 2 step : Measurement     • Minimising the following log-likelihood : • generalized least squared method is applied leading to an analytical solution. Nikola Makovec

  6. Description of the method (2) • The reference distribution Nikola Makovec

  7. Method testing (1) • Done at the generator level • Injected bias drawn from a Gaussian(,) • Gaussian(0,2%) Nikola Makovec

  8. Method testing (2) • Gaussian(,2%) Nikola Makovec

  9. Method testing (3) • Expected constant term as a function of the luminosity Nikola Makovec

  10. Results with misaligned and distorted geometry (1) • Gaussian(0,0%) Nikola Makovec

  11. Results with misaligned and distorted geometry (2) Nikola Makovec

  12. Results with misaligned and distorted geometry (3) • Gaussian(0,2%) Nikola Makovec

  13. Results with misaligned and distorted geometry (4) Nikola Makovec

  14. Conclusion • With~200pb-1: • Constant term ~ 0.7% • Absolute scale known with a precision of few percent • Care of extrapolation to other energy spectrum (linearity?) • Amount of material in front of the detector : • E/p • Conversion • Energy flow Nikola Makovec

  15. To do list Photo non contractuelle • Corrections de la note : • Fond? • Forme • Style et orthographe • Si vous avez un peu de temps: • /exp/atlas/makovec/Notes/CSC-EG-6.pdf • Pot pour mon retour au LAL : • Vendredi 21 décembre à 11h30 • Salle 129 Nikola Makovec

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