1 / 26

Cluster Shape Variables and ECAL Isolation Issue in Z -> mumugamma Process

This study focuses on the analysis of cluster shape variables and the ECAL isolation issue in the Z -> mumugamma process. The comparison between 2012 data and MC samples, as well as data-data comparisons between 2011 and 2012, are presented. The analysis includes the identification of electrons as photon candidates, selection criteria, and normalization to the number of entries in data. Various cluster shape variables were investigated, such as R9, E2x2/E5x5, Eseed/ESCraw, eta width, phi width, and second moments. The results provide valuable insights into the performance of the ECAL and can contribute to the development of more accurate measurement techniques.

rpamela
Download Presentation

Cluster Shape Variables and ECAL Isolation Issue in Z -> mumugamma Process

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. S. Gascon-Shotkin H. Brun J. Fan O. Bondu et al 4 May 2012 Photon Commissioning 2012: Cluster shape variables, Z and the ECAL Isolation issue in 2011 O. Bondu, H. Brun, S. Gascon-Shotkin, M. Lethuillier, L. Sgandurra Institut de Physique Nucléaire de Lyon/Universite Claude Bernard Lyon 1 G. Chen, J. Fan, J. Tao, H. Xiao, Y. Shen IHEP Beijing D. Berry, N. Marinelli University of Notre Dame O. Bondu Thursday, 22 March 2012 DPG/PH Egamma Meetinghttps://indico.cern.ch/conferenceDisplay.py?confId=183123

  2. Introduction and details • Electrons identified as photon candidates: Data-MC comparisons: • Data: Photon PD with no additional HLT requirements, • Jason file: Cert_190456-191859_8TeV_PromptReco_Collisions12_JSON.txt • MC: Zee , /DYToEE_M_20_TuneZ2star_8TeV_pythia6/Summer12-PU_S7_START50_V15-v1/AODSIM with 2M events. • Selection: RECO Photon Object with Et>20 GeV, hasPixelSeed=1, about 153k candidates pass selection • Normalisation: To number of entries in data • Z: 2012 Data-MC and 2012-2011 Data-Data comparisons • Data: DoubleMuon PD with no additional HLT requirements. 2012: 1st Golden JSON + 2nd DCS-only JSON (no estimate of integrated lumi) 2011: Jan16 ReReco • MC: /DYToMuMu_M_20_TuneZ2star_8TeV_pythia6/Summer12-PU_S7_START50_V15-v1/AODSIM • Selection: Usual ECAL DPG/EGM Ztight selection for data/MC, loose selection for data-data [1]. 1347 events selected for tight selection. Purity (MC-truth-determined): 98.9 % overall ( 99.4% EB/ 97.7% EE) • Normalisation: To number of entries in data. WARNING: Numbers shown are raw numbers for *both* data and MC • Many more plots here: • for 2012 data VS 2011 Jan 16 data:https://test-obondu2.web.cern.ch/test-obondu2/index.php?selection=2012.04.18_Plots_DataData&action=go • for 2012 data VS Summer12 MC:https://test-obondu.web.cern.ch/test-obondu/index.php?selection=2012.04.19_Plots_DataMC • NO pileup-reweighting for either case yet (virtually no impact on cluster-shape variables) [1] see for example O. Bondu Thursday, 22 March 2012 DPG/PH Egamma Meeting https://indico.cern.ch/conferenceDisplay.py?confId=183123 S. Gascon-Shotkin H. Brun J. Fan O. Bondu et al 4 May 2012

  3. Number of Reco Vertices Zee e identified as photon candidate Z • Points: Data; Histogram: Zee MC (sorry for misleading legend) S. Gascon-Shotkin H. Brun J. Fan O. Bondu et al 4 May 2012

  4. Cluster Shape Variables: R9 Zee e identified as photon candidate • MC has been rescaled with Spring11 as target: see backup slide from https://indico.cern.ch/getFile.py/access?contribId=9&sessionId=6&resId=1&materialId=slides&confId=155716 S. Gascon-Shotkin H. Brun J. Fan O. Bondu et al 4 May 2012

  5. Cluster Shape Variables: R9 Z EB EE S. Gascon-Shotkin H. Brun J. Fan O. Bondu et al 4 May 2012

  6. Cluster Shape Variables EB: E2x2/E5x5 • MC has been rescaled with Spring11 as target: see backup slide from https://indico.cern.ch/getFile.py/access?contribId=9&sessionId=6&resId=1&materialId=slides&confId=155716 S. Gascon-Shotkin H. Brun J. Fan O. Bondu et al 4 May 2012

  7. Cluster Shape Variables EE: E2x2/E5x5 • MC has been rescaled with Spring11 as target: see backup slide from https://indico.cern.ch/getFile.py/access?contribId=9&sessionId=6&resId=1&materialId=slides&confId=155716 S. Gascon-Shotkin H. Brun J. Fan O. Bondu et al 4 May 2012

  8. Cluster Shape Variables EB: R19 S. Gascon-Shotkin H. Brun J. Fan O. Bondu et al 4 May 2012

  9. Cluster Shape Variables EE: R19 S. Gascon-Shotkin H. Brun J. Fan O. Bondu et al 4 May 2012

  10. Cluster Shape Variables EB: Eseed/ESCraw S. Gascon-Shotkin H. Brun J. Fan O. Bondu et al 4 May 2012

  11. Cluster Shape Variables EE: Eseed/ESCraw S. Gascon-Shotkin H. Brun J. Fan O. Bondu et al 4 May 2012

  12. Cluster Shape Variables EB: width S. Gascon-Shotkin H. Brun J. Fan O. Bondu et al 4 May 2012

  13. Cluster Shape Variables EE : width S. Gascon-Shotkin H. Brun J. Fan O. Bondu et al 4 May 2012

  14. Cluster Shape Variables EB: ‘Brem’ ’Brem’= Phiwidth/etawidth S. Gascon-Shotkin H. Brun J. Fan O. Bondu et al 4 May 2012

  15. Cluster Shape Variables EE : ’Brem’ ’Brem’= Phiwidth/etawidth S. Gascon-Shotkin H. Brun J. Fan O. Bondu et al 4 May 2012

  16. Cluster Shape Variables EB: 2nd moments (CEP) S. Gascon-Shotkin H. Brun J. Fan O. Bondu et al 4 May 2012

  17. Cluster Shape Variables EE: 2nd moments (CEP) S. Gascon-Shotkin H. Brun J. Fan O. Bondu et al 4 May 2012

  18. Cluster Shape Variables EB: 2nd moments, lambda ratio lambda-/lambda+ S. Gascon-Shotkin H. Brun J. Fan O. Bondu et al 4 May 2012

  19. Cluster Shape Variables EE: 2nd moments, lambda ratio lambda-/lambda+ S. Gascon-Shotkin H. Brun J. Fan O. Bondu et al 4 May 2012

  20. Cluster Shape Variables EB: lambda-/CEE S. Gascon-Shotkin H. Brun J. Fan O. Bondu et al 4 May 2012

  21. Cluster Shape Variables EE: lambda-/CEE lambda-/CEE S. Gascon-Shotkin H. Brun J. Fan O. Bondu et al 4 May 2012

  22. Cluster Shape Variables EB : ii Eiand ihi: Energy and hindex of the ith crystal within the 5×5 matrix centered on the seed crystal Ihseed: hindex of the seed crystal. S. Gascon-Shotkin H. Brun J. Fan O. Bondu et al 4 May 2012

  23. S. Gascon-Shotkin H. Brun J. Fan O. Bondu et al 4 May 2012 Cluster Shape Variables EE: ii

  24. ECAL Isolation Issue: seen already in 2011 2011A 2011B S. Gascon-Shotkin H. Brun J. Fan O. Bondu et al 4 May 2012 24

  25. S. Gascon-Shotkin H. Brun J. Fan O. Bondu et al 4 May 2012 Conclusion In short ,most things are well-reproduced and well-understood (modulo rescalings which need to be reoptimised for the preselections used). Zgamma results from Globe (similar to Nancy’s presentation last week) should be available soon

  26. Backup: Data/MC Comparisons, rescaling (4) (1) (3) (1) (1) (1) (2) (2) (3) Using Spring 11 MC as a pdf,calculate NLL for different trial scaling factors, select maximum and scale Summer11 MC. A simple solution which works well for some variables. Further investigation is in progress.

More Related