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Status of muon simulations

Status of muon simulations. Anna Kiseleva. Outline. Standard muon system evolution present version Muon simulations background study time measurements results for different collision systems Muon system optimizations clustering detector inefficiency material of pipe shielding

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Status of muon simulations

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  1. Status of muon simulations Anna Kiseleva

  2. Outline • Standard muon system • evolution • present version • Muon simulations • background study • time measurements • results for different collision systems • Muon system optimizations • clustering • detector inefficiency • material of pipe shielding • absorber study • possible modifications of muon system • e noise: first results • Important future steps

  3. Muon system

  4. Muon system evolution 2004 2005 1. ~90% of π and ~50% of K decay to μ 2. one needs to determined precisely(~1º) kink angle S/B ratio is too bad. One needs to have more then 1 detector layer between absorbers 2008 2006 2007 One needs to have more compact system as possible One needs to optimize system for different options (LMVM & charm) Additional pipe shielding is needed

  5. Standard Muon Chambers (MuCh) system 5% occupancy for central Au+Au collisions at 25 AGeV w/o shielding 20 20 20 30 35 100 cm min pad 1.42.8 mm2 Fe max pad 44.844.8 mm2 Total number of channels: 480 768 shielding ≡ 7.5 λI ≡ 13.5 λI low-mass vector meson measurements (compact setup)

  6. Muon simulations

  7. Tracking procedures Reconstructed background: L1 Lit For p and K suppressions we need one more pID measurement ω + central Au+Au collisions at 25 AGeV

  8. Time measurements in MuCh m2 = β = γ = m2 = P2 ( - 1) 1 P2 β2 (β × γ)2 L 1 c × t √1 – β2 ω + central Au+Au collisions at 25 AGeV ToF time resolution 80 ps signal μ background

  9. Results ω + central Au+Au collisions at 25 AGeV with ToF

  10. Results for different collision systems see talk 16.10 SIS 300 SIS 100 * in order to increase the acceptance of reconstructed ω we can use different type of tracks

  11. Muon system optimizations

  12. Clusters + Avalanches (C&A) primary electrons sec. electrons ω + central Au+Au collisions at 25 AGeV

  13. Track reconstruction with reduced detector efficiency minimum 9 hits required minimum 14 hits required ω→μ+μ- + central Au+Au collisions at 25 AGeV

  14. Material of pipe shielding central Au+Au collisions at 25 AGeV 1 2 3 particles/(event×cm2) ― Fe ― W ― Pb + Fe 4 5 particles/(event×cm2)

  15. Thickness of first Fe see talk 16.10 10 cm  100 cm central Au+Au collisions at 25 AGeV ω→μ+μ- + central Au+Au collisions at 25 AGeV central Au+Au collisions at 25 AGeV 10 cm Fe 20 cm Fe 4 30 cm Fe 40 cm Fe ω

  16. Alternative muon systems central Au+Au collisions at 25 AGeV 40 20 20 20 25 10 cm Fe 20 cm Fe 30 cm Fe 40 cm Fe 30 20 20 20 35 20 20 20 30 35 10 20 30 30 35 see talk 16.10

  17. MuCh 25 30 40 40 see talk 16.10 Nchannels 439 296 → 272 384 min pad size (mm2): 1.4×2.8 2.8×2.8 2.8×5.6 5.6×5.6 25 30 40 40

  18. Comparison with standard see talk 16.10 ω + central Au+Au collisions at 25 AGeV ―standard compact MuCh ―MuCh 25 30 40 40

  19. Electron noise central Au+Au collisions at 25 AGeV see talk 16.10 • Create true hit (X0, Y0) • If e, create new point (X0+∆X, Y0+∆Y) • Create noise hit (Xnoise, Ynoise) • Possibility to create more then 1 noise hit from 1 true e e MC points ―standard hits additional e: ―+1 ―+2 ―+5 ―+10 ?

  20. Reconstruction with e-noise ω + central Au+Au collisions at 25 AGeV see talk 16.10

  21. Summary • Simulation tools have been developed to design and optimize CBM muon detection system. • Present muon detector design is tested for different collision systems, and is able to measure muons already at SIS100. • Simulations with additional electron noise show the possibility to separate reconstructed signal and background even when increasing 3 times the number of secondary electrons, which corresponds to increasing of hit density more than 2 times.

  22. Next steps • Implementation of: • realistic detector discription • different type of the detectors • inefficiency of the detectors • muon trigger • additional secondary electrons with correlated hits in detectors • Muon system optimizations: • number of sensitive layers • thickness of absorbers • optimization tacking into account costs • Test of possible solutions of muon system using LMVM and charmonium simulations

  23. Wish list • Implementation of flexible Hit Producer • possibility to change the structure of detector layer • possibility to change thesize of detectors only inregion of interest • size of detectors in X and Y directions are independent wish now now

  24. Thank you for your attention!

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