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Klaus Dehmelt Laszlo Baksay Marcus Hohlmann

Investigation of leptonic structure functions with lepton pairs produced in single tagged 2 g events. Klaus Dehmelt Laszlo Baksay Marcus Hohlmann. LEP- L3 Experiment at CERN. L arge E lectron P ositron Collider L E P.

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Klaus Dehmelt Laszlo Baksay Marcus Hohlmann

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  1. Investigation of leptonic structure functions with lepton pairs produced in single tagged 2g events. Klaus Dehmelt Laszlo Baksay Marcus Hohlmann

  2. LEP-L3 Experiment at CERN Large Electron Positron ColliderLEP FAS 2005 – K. Dehmelt – March, 18th

  3. QED test up toexperimental check for procedures adopted in the study of hadronic structure function • Calibration of accelerators with colliding pp beams (LHC) • Measurement of transverse and longitudinal leptonic structure functions with two-photon helicity consideration Why studying leptonic structure function ? FAS 2005 – K. Dehmelt – March, 18th

  4. L3 – The Detector FAS 2005 – K. Dehmelt – March, 18th

  5. Physics at LEP and L3 e+e-- collisions FAS 2005 – K. Dehmelt – March, 18th

  6. Two-Photon Interactionswith Dilepton Events • Event Signature: • Single Tagged Electron, High Energy Deposition in Electromagnetic Calorimeters • Two tracks, at least one to be identified as a lepton (m,e) • Compare Data to Monte Carlo generated events (DIAG36) FAS 2005 – K. Dehmelt – March, 18th

  7. Dilepton Kinematics FAS 2005 – K. Dehmelt – March, 18th

  8. L3 Tagging Subdetectors Very Small Angle Tagger – VSAT Luminosity Monitor – LUMI Active Lead Ring – ALR Electromagnetic Calorimeter Endcaps – BGO Endcaps Tagging detectors used to identify scattered electron VSAT: huge background due to proximity to beam pipe FAS 2005 – K. Dehmelt – March, 18th

  9. Study of VSAT VSAT is moved for beam filling  Alignment Studies Huge VSAT background due to scattered beam electrons FAS 2005 – K. Dehmelt – March, 18th

  10. Study of VSAT with mm Acoplanarity of selected two track events FAS 2005 – K. Dehmelt – March, 18th Cut

  11. Study of VSAT with mm Invariant mass distribution of di-lepton events (mm) for 1998-2000, selected with HCAL FAS 2005 – K. Dehmelt – March, 18th

  12. Study of VSAT with mm Invariant mass distribution of di-lepton events (mm) for 1998-2000, selected with MUCH FAS 2005 – K. Dehmelt – March, 18th

  13. Outlook • Determine p contamination Neural Network Method • Determine t background • Selection of LUMI- , ALR- , and ENDCAP- tagged events • Determine Cross-section FAS 2005 – K. Dehmelt – March, 18th

  14. The Cross-Section FAS 2005 – K. Dehmelt – March, 18th

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