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Ronen Ingbir

Tel Aviv University HEP Experimental Group. C ollaboration. FCAL. High precision design. Precision Luminosity Measurement. Ronen Ingbir. Krakow 2006. Events. Events. Tel Aviv University HEP Experimental Group. Energy (GeV). (rad). C ollaboration. FCAL.

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Ronen Ingbir

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  1. Tel Aviv University HEP Experimental Group Collaboration FCAL High precision design Precision Luminosity Measurement Ronen Ingbir Krakow2006

  2. Events Events Tel Aviv University HEP Experimental Group Energy (GeV) (rad) Collaboration FCAL High precision design Bhabha Scattering Krakow2006

  3. Tel Aviv University HEP Experimental Group Collaboration FCAL High precision design Bhabha Scattering Head-on Y (cm) Events (rad) X (cm) Krakow2006

  4. Tel Aviv University HEP Experimental Group Collaboration FCAL High precision design Bhabha Scattering 20mrad X-angle Detector axis Y (cm) Events (rad) X (cm) Krakow2006

  5. Tel Aviv University HEP Experimental Group Collaboration FCAL High precision design Bhabha Scattering 20mrad X-angle Outgoing beam Y (cm) Events (rad) X (cm) Krakow2006

  6. Tel Aviv University HEP Experimental Group Collaboration FCAL High precision design Outgoing beam  flat azimuthal distribution Y (cm) Y (cm) X (cm) X (cm) Events Events (rad) (rad) Krakow2006

  7. Tel Aviv University HEP Experimental Group Collaboration FCAL High precision design Luminosity precision determination N1 : Reconstructed and generated in acceptance region. N2 : Generated in acceptance region but reconstructed outside. N3 : Generated outside acceptance region but reconstructed inside. Krakow2006

  8. No Yes Tel Aviv University HEP Experimental Group Collaboration FCAL High precision design Counting Bhabha events Krakow2006

  9. Headon, 14,20 mrad X-angle outgoing beam 14 mrad X-angle detector axis 20 mrad X-angle detector axis Tel Aviv University HEP Experimental Group Collaboration FCAL High precision design Krakow2006

  10. Headon, 14,20 mrad X-angle outgoing beam 14 mrad X-angle detector axis 20 mrad X-angle detector axis Δz Tel Aviv University HEP Experimental Group Collaboration FCAL High precision design Krakow2006

  11. Δr Δz Δr Tel Aviv University HEP Experimental Group Δz Collaboration FCAL High precision design Bhabha Scattering Outgoing beam ΔL/L=10-4 Krakow2006

  12. Headon, 14,20 mrad X-angle outgoing beam 14 mrad X-angle detector axis 20 mrad X-angle detector axis Tel Aviv University HEP Experimental Group Collaboration FCAL High precision design Krakow2006

  13. Headon, 14,20 mrad X-angle outgoing beam 14 mrad X-angle detector axis 20 mrad X-angle detector axis Tel Aviv University HEP Experimental Group Collaboration FCAL High precision design Krakow2006

  14. Tel Aviv University HEP Experimental Group Collaboration FCAL High precision design Are these numbers realistic ?  • Bhabha events sample will not be pure (background). • Magnetic field changes the distribution (could be a dramatic effect if not aligned with the outgoing beam). • Event position and energy reconstruction is not perfect. • To evaluate the real error on luminosity one should apply MC – DATA corrections.    Krakow2006

  15. Tel Aviv University HEP Experimental Group Collaboration FCAL High precision design X- angle background Beamstrahlung pair background 20 mrad, DID 250 GeV 20 mrad, anti DID Christian Grah, DESY-Zuethen Krakow2006

  16. Tel Aviv University HEP Experimental Group Collaboration FCAL High precision design Magnetic field along the outgoing beam Krakow2006

  17. Tel Aviv University HEP Experimental Group Collaboration FCAL High precision design Fast detector simulation – bias Changing the bias with a fixed resolution. Krakow2006

  18. Tel Aviv University HEP Experimental Group Collaboration FCAL High precision design Fast detector simulation – resolution Changing the detector resolution with no bias Krakow2006

  19. Tel Aviv University HEP Experimental Group Collaboration FCAL High precision design How does the LumiCal performance contribute to the detector displacements ? Krakow2006

  20. without Including Tel Aviv University HEP Experimental Group Collaboration FCAL High precision design Adding detector performance Using bias and resolution of Pad design LumiCal Krakow2006

  21. without Including Tel Aviv University HEP Experimental Group Collaboration FCAL High precision design Adding detector performance Using bias and resolution of Pad design LumiCal Krakow2006

  22. Tel Aviv University HEP Experimental Group Collaboration FCAL High precision design Data and MC In real life we can include the detector performance (which is measured in test beam) into MC. The only question is: How well should we know the detector performance ? Krakow2006

  23. Tel Aviv University HEP Experimental Group Collaboration FCAL High precision design Exercise Test case: 20 mrad X-angle, LumiCal sits on detector axis Unknown beam offset (amount, angle) Simulation includes detector radius resolution and bias (Pad LumiCal) Other parameters known What will be the error on luminosity after using MC to correct DATA ? Krakow2006

  24. Tel Aviv University HEP Experimental Group Collaboration FCAL High precision design 20mrad X-angleDetector axis Y (cm) N3 N1 N4 N2 X (cm) Krakow2006

  25. 1 mm beam shift 0.5 mm beam shift 0.3 mm beam shift Tel Aviv University HEP Experimental Group Collaboration FCAL High precision design “Beam position” Events (up – down) Events (right – left) Krakow2006

  26. Before correction after correction Tel Aviv University HEP Experimental Group Collaboration FCAL High precision design 20mrad X-angleDetector axis ΔL/L~10-3 But !!!!!! This is assuming knowing in perfect precision many parameters ΔL/L~10-2 Krakow2006

  27. Tel Aviv University HEP Experimental Group Collaboration FCAL High precision design Krakow2006

  28. Tel Aviv University HEP Experimental Group Collaboration FCAL High precision design Summary Our recommendation at ECFA2005 still holds Krakow2006

  29. Tel Aviv University HEP Experimental Group Collaboration FCAL High precision design Head-on design Overlap region LumiCal rmin=8 cm rmax=28 cm BeamCal rmin=1.5 cm rmax=10 cm Beam hole Krakow2006

  30. Tel Aviv University HEP Experimental Group Collaboration FCAL High precision design X- angle design (step 1) LumiCal rmin=13 cm rmax=28 cm (Reasonable Statistics) BeamCal rmin=2 cm rmax=16 cm Beam hole Krakow2006

  31. Detectors are centered around the outgoing beam Tel Aviv University HEP Experimental Group Collaboration FCAL High precision design X- angle design (step-2) BeamCal + 30o blind area (incoming beam) Krakow2006

  32. Tel Aviv University HEP Experimental Group Collaboration FCAL High precision design http://alzt.tau.ac.il/~ronen/ Username: ronen Password : msc Krakow2006

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