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Luminosity. Measurement using BHABHA events. Tel Aviv University HEP experimental Group. MDI SLAC. Ronen Ingbir. Lumical - A F uture L inear C ollider detector. HEP Tel Aviv University. Strip design. ΔE~0.31√E. L. R. Cracow. Lumical - A F uture L inear C ollider detector.

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## HEP Tel Aviv University

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**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**Strip design**ΔE~0.31√E L R Cracow Lumical - A Future Linear Collider detector**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**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**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**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**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**Magnetic field**Lumical - A Future Linear Collider detector HEP Tel Aviv University**Background studies**BHWIDE + CIRCE Lumical - A Future Linear Collider detector HEP Tel Aviv University**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**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**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**Angular resolution**Lumical - A Future Linear Collider detector HEP Tel Aviv University**Bias study**‘Pure’ electrons simulation Bhabha+Beam+BS(5e-4) Lumical - A Future Linear Collider detector HEP Tel Aviv University**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**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**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**New geometric acceptance**Events Energy Resolution Lumical - A Future Linear Collider detector HEP Tel Aviv University**Optimization**Lumical - A Future Linear Collider detector HEP Tel Aviv University**Margins in between cells**Energy resolution Polar resolution Lumical - A Future Linear Collider detector HEP Tel Aviv University**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**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**High Statistics MC**BHWIDE + fast detector simulation Lumical - A Future Linear Collider detector HEP Tel Aviv University**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**THE END**Lumical - A Future Linear Collider detector HEP Tel Aviv University

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