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Fast Simulation for Large-Scale Material Studies in High-Energy Physics

Simulated large samples of different materials for Drell-Yan studies. Achieved fast simulation with focus on electrons and gammas, no jet fragmentation. Investigating material dependence and cross-section for high-energy bremsstrahlung.

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Fast Simulation for Large-Scale Material Studies in High-Energy Physics

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  1. Material Studies StatusGreg, Sunny, Eva, Pasha, Giulia,YKK,… • Simulated large sample Drell-Yan • With 4.6% X0 Cu instead of Si layer • Crosschecked with (Si) 5.5% X0! • Need many samples with different materials • Carbon, Silicon, Copper, and Lead • 3%, 6%, and 9% X0 each • 500k events per sample • Need 5.5M events  need fast simulation • Getting fast simulation • Only need e’s and g’s • No jet fragmentation (MSTJ(1)=0) • Turn off silicon hit simulation • simulateSvx set f • 13s / event 0.7s / event • 170 kb / event  12 kb / event

  2. Numbers • Looking at E/P ratio (0.9:1.1)/(1.5:2.5) • No Layer (full MC) : 5.68  0.08% X0 • No Layer (fast MC) : 5.71  0.05% X0

  3. Plots (%) (%)

  4. What next… • Type of material dependence • Approx. cross section for high E brems. • k: energy of photon • y= k/E • A: atomic number • So E/P is sensitive to X0 and type of material • Good news: need fewer X0 of copper • Will agree better with dE/dx • Estimate: 4.5%  1.5% X0 of Cu • A. Korn (dE/dx): • .25  0.1 cm Si5.4%  3.1% X0 Cu

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