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TRD Acceptance in pp run1

TRD Acceptance in pp run1. Evgeny Kryshen (PNPI, Gatchina). Simulation conditions. TRD in pp run 1 (from Christoph Blume): The minimum number of TRD supermodules should be 1 (from total 18) The optimistic maximum is 4 supermodules

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TRD Acceptance in pp run1

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  1. TRD Acceptance in pp run1 Evgeny Kryshen (PNPI, Gatchina)

  2. Simulation conditions TRD in pp run 1 (from Christoph Blume): • The minimum number of TRD supermodules should be 1 (from total 18) • The optimistic maximum is 4 supermodules • It is possible to install TRD supermodules in two arms to get better acceptance • No TRD L1 trigger in run 1 Simulation environment: • Aliroot HEAD: 9 March 2006 • Fast simulation for electrons: response LUT (J.F. Grosse-Oetringhaus) • Generator: AliGenParam, “CDF scaled” parametrization at 14 TeV PWG3 meeting, 18 April 2006

  3. Phase space distributions • Pt distributions are obtained with extrapolation of CDF data*: • fit of CDF pt distribution @ 1.96 TeV • extrapolation 1.96  14 TeV: <pt2> dependence on s according to CEM • *From D. Stocco talk at the 3rd DIMUONnet workshop PWG3 meeting, 18 April 2006

  4. J/ψ acceptance with full azimuthal coverage • Acceptance includes tracking efficiency and TRD electron identification efficiency • Integrated acceptance: 4.85%(normalized to the full phase space) PWG3 meeting, 18 April 2006

  5. J/ψ acceptance vs φ coverage • Clear quadratic dependence on the TRD azimuthal coverage PWG3 meeting, 18 April 2006

  6. J/ψ acceptance with 1 TRD supermodule • TRD azimuthal coverage: 0 – 200 • Integrated acceptance: 0.0061 % • Vanishing J/ψacceptance at low transverse momenta • The shape of acceptance distribution vs rapidity is changes only slightly PWG3 meeting, 18 April 2006

  7. J/ψ acceptance with 2 TRD supermodules • TRD azimuthal coverage:0 – 400 • Integrated acceptance: 0.0289 % • It is possible to improve acceptance by placing supermodules in two arms PWG3 meeting, 18 April 2006

  8. 2 TRD supermodules in 2 arms: optimization • Optimal φ coverage: 00 - 200; 800 – 1000 • Integrated acceptance: 0.0562 %(two times increase comparing to 1 arm solution) PWG3 meeting, 18 April 2006

  9. 2 arms: J/ψ acceptance pt and φ • Three peaks in φ distribution are clearly observed: • 1 peak – both e+ and e- are accepted in the 1st arm • 2 peak – e+ and e- are accepted in different arms • 3 peak – both e+ and e- are accepted in the 2nd arm • Acceptance is improved due to better acceptance at low pt, where the cross-section is highter PWG3 meeting, 18 April 2006

  10. 3 supermodules: optimized acceptance • Optimal φ coverage: 00 - 400; 1000 – 1200 • Integrated acceptance: 0.1186 % • Possible solution: 00 - 400; 800 – 1000 • Asymmetric J/ψ acceptance in φ • 3 arms ? PWG3 meeting, 18 April 2006

  11. 4 supermodules: optimized acceptance • Optimal φ coverage: 00 - 400; 800 – 1200 • Integrated acceptance: 0.2250 % PWG3 meeting, 18 April 2006

  12. Expected yields • Total cross-section for prompt J/ψ at 14 TeV: σ = 3.18 μb • Obtained by CEM extrapolation from CDF cross-sections – conservative approach • Includes feed-down from quarkonium resonances • Includes BR(J/ψ e+ e-) • Luminosity: 1030 cm-2 s-1 • Running time: 200 h = 7.2 x 105 s • Total J/ψ e+ e- decays: N = 2.29 x 106 PWG3 meeting, 18 April 2006

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