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HEP Tel Aviv University

Explore the research on Luminosity Measurement using BHABHA events and the future Linear Collider Detector development at Tel Aviv University. The study covers various aspects of detector design, reconstruction algorithms, energy resolution, bias studies, angular resolution, simulation distribution, and optimization.

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HEP Tel Aviv University

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  1. Luminosity Measurement using BHABHA events Tel Aviv University HEP experimental Group MDI SLAC Ronen Ingbir Lumical - A Future Linear Collider detector HEP Tel Aviv University

  2. Strip design ΔE~0.31√E L R Cracow Lumical - A Future Linear Collider detector

  3. Cell Size 1.3cm*2cm> 1.3cm*6cm< ~1 Radiation length ~1 Radius Moliere Pad design 15 cylinders * 24 sectors * 30 rings = 10800 cells 8 cm 0.31 cm Silicon 28 cm 0.34 cm Tungsten R L 6.10 m Lumical - A Future Linear Collider detector HEP Tel Aviv University

  4. Log. weight. E weight. Reconstruction Algorithm We explored two reconstruction algorithms: Events Num. T.C Awes et al. Nucl. Inst. Meth. A311 (1992) 130. The log. weight fun. was designed to reduce steps in a granulated detector : 1. Selection of significant cells. 2. Log. smoothing. Lumical - A Future Linear Collider detector HEP Tel Aviv University

  5. Logarithmic Constant 400 GeV After selecting: We explored a more systematic approach. The first step is finding the best constant to use under two criteria: 1. Best resolution. 2. Minimum bias. Constant value Constant value Lumical - A Future Linear Collider detector HEP Tel Aviv University

  6. Energy dependent constant The goal is to find a global weight function. Is the the log. weight constant really a constant ? Constant value Lumical - A Future Linear Collider detector HEP Tel Aviv University

  7. Shower size Log. Weight Selection Shower reconstruction What happens when we select the best log. weight constant ? Num. of Cells Num. of Sectors Energy portion (%) Num. of Cylinders Most of the information is in the selected cells. En>90% Lumical - A Future Linear Collider detector HEP Tel Aviv University

  8. Magnetic field Lumical - A Future Linear Collider detector HEP Tel Aviv University

  9. Background studies BHWIDE + CIRCE Lumical - A Future Linear Collider detector HEP Tel Aviv University

  10. Out In Eout-Ein P= Eout+Ein 33 mrad Geometric acceptance Energy Resolution 3 cylinders 2 cylinders 1 cylinders Lumical - A Future Linear Collider detector HEP Tel Aviv University

  11. Simulation distribution Distribution after acceptance and energy balance selection Left-Right balance R L Right signal - Left signal Left side detector signal Right side detector signal Lumical - A Future Linear Collider detector HEP Tel Aviv University

  12. Ntuple Nocuts Withcuts Pure electrons 31% 29% Bhabha 42% 24% Bhabha + Beamstrahlung 45% 24% Bhabha + Beamstrahlung + Beam spread (0.05%) 46% 25% Bhabha + Beamstrahlung + Beam spread (0.5%) 49% 29% Energy resolution Lumical - A Future Linear Collider detector HEP Tel Aviv University

  13. Angular resolution Lumical - A Future Linear Collider detector HEP Tel Aviv University

  14. Bias study ‘Pure’ electrons simulation Bhabha+Beam+BS(5e-4) Lumical - A Future Linear Collider detector HEP Tel Aviv University

  15. Real life algorithm Working with both sides of the detector and looking at the difference between the reconstructed properties: (In real life we don’t have generated properties) Lumical - A Future Linear Collider detector HEP Tel Aviv University

  16. Dense design 0.31 cm Silicon 0.34 cm Tungsten 0.1 cm Silicon 0.55 cm Tungsten Lumical - A Future Linear Collider detector HEP Tel Aviv University

  17. 0.8cm 1.1cm Moliere radius & Radiation length Detector Signal Z (cm) 30 radiation length detector 47 radiation length detector Lumical - A Future Linear Collider detector HEP Tel Aviv University

  18. New geometric acceptance Events Energy Resolution Lumical - A Future Linear Collider detector HEP Tel Aviv University

  19. Optimization Lumical - A Future Linear Collider detector HEP Tel Aviv University

  20. Margins in between cells Energy resolution Polar resolution Lumical - A Future Linear Collider detector HEP Tel Aviv University

  21. 4 rings 15 rings 11 rings 30 rings 15 cylinders 10 cylinders 20 cylinders 10cylinders 24 sectors * 15 rings * (10 cylinders + 20 cylinders) = 10,800 channels Maximum peak shower design Our basic detector is designed with 30 rings * 24 sectors * 15 cylinders = 10,800 channels Do we use these channels in the most effective way ? Lumical - A Future Linear Collider detector HEP Tel Aviv University

  22. 0.13e-3 rad 0.11e-3 rad Polar reconstruction Maximum peak shower design Basic Design Constant value Angular resolution improvement without changing the number of channels Other properties remain the same Constant value Lumical - A Future Linear Collider detector HEP Tel Aviv University

  23. High Statistics MC BHWIDE + fast detector simulation Lumical - A Future Linear Collider detector HEP Tel Aviv University

  24. Pure electron MC Detector properties ‘Real physics’ MC Events selection Bhabha + Beamstrahlung + Beamspread High statistics MC ‘Real physics’ MC + digitization + elec. noise + New max peak design + Margins Final optimization R&D status & future steps Luminosity with a crossing angle Luminosity with polarised beams (Gideon Alexander) Lumical - A Future Linear Collider detector HEP Tel Aviv University

  25. THE END Lumical - A Future Linear Collider detector HEP Tel Aviv University

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