1 / 18

Charm Particle Simulation Studies in CBM Collaboration: Key Findings and Future Plans

This presentation discusses the results of charm particle simulations, specifically focusing on D+, D0, and Λ+c production at various energy levels. The studies utilized the CBM experimental setup and included signal and background simulation analyses with tools like Pythia and UrQMD. Key findings include tracking efficiencies, cut optimization for D+ → K-π+π+, D0 → K-π+π+π-, and Λ+c → pK-π+ reconstructions. The presentation outlines the methodology for primary vertex reconstruction, background study, and future plans for enhancing particle identification and realistic detector configurations.

seanna
Download Presentation

Charm Particle Simulation Studies in CBM Collaboration: Key Findings and Future Plans

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Open charm simulations (D+,D0,+c) I.Vassiliev, S.Gorbunov, I. Kisel, S. Seddiki and I. Sevastiuk CBM Collaboration Meeting 26-Sep-07 • Sts geometry: 2MAPS +6strip (Strasbourg geo) or 2M2H4S (D+ and D- at 25AGeV); • TOOLS: signal (D+K-+ +; +cpK-+and D0K-+ +-) , and background (central UrQMD) simulation; 15,25,35 AGeV; Pythia signal generator by D.Bertini; • Tracking (fast), • Primary Vertex Reconstruction, • Background study. Cuts optimization. S/BG ratios; • D+K-+ +; D0K-+ +- and +cpK-+ reconstruction; • Summary & plans

  2. CBM (light) setup Sts + TOF 8 stations (10,20,30,50,62.5,75,87.5,100 cm) 2 first in vacuum Topology: stations 1,2 – MAPS, 3-8 – Strips or (3,4Hybrids) "MAPS" (150m), first two station with 10x10m cell size "Strip"-detectors (400m), 50m strip-pitch, ½ strip length; Realistic hit producers sts_digi_new_standard-3.par

  3. MAPS + strips: 96.23 ± 0.09 (D+) MAPS +strips: 92.87 ± 0.14 efficiency [%] momentum [GeV/c] Tracking in STS Algorithm: “Cellular Automaton + Kalman Filter” by I.Kisel Tracking efficiency: 697 rec. tracks~ 1% ghost tracks all rec. tracks primary tracks (signal) central collision Au beam, 25 AGeV, on Au target Momentum resolution: ~ 1% 78 ms on Pentium 4

  4. primary vertex reconstruction sv K- + pv - + 5.7 µm zmc-zreco (cm)

  5. + c D+K-+ +; +c pK-+and D0K-+ +- z-vertex reconstruction D+K-+ + sv K- old p pv + new

  6. Strategy: background suppression keeping maximum of efficiency single track parameters based cuts: • χ2primon the impact parameter (lower value) 4.5-6.5 • IP impact parameter cut (upper value) 1mm • track momentum cut p > 1.0 GeV/c • track transverse momentum pt > 0.25 GeV/c multiple track (particle) parameters based cuts: • χ2GEOgeometrical constrained fit 3.0 • χ2TOPO topological constrained fit 2.0

  7. central UrQMD Background study; tracks y zR xR x z

  8. Cut optimization D+K-+ + @ 25 AGeV χ2primon the impact parameter (lower value) S/B

  9. Cut optimization D+K-+ + @ 25 AGeV 1k central UrQMD  ~2.8x1015 “triplets" χ2prim > 6.5 , pt > 0.25 GeV/c, p > 1 GeV/c, Ip < 1 mm : 1k central UrQMD  ~108 “triplets" after the cuts

  10. Background study, tracks and vertices cτD+ = 312 m cτD0 = 123 m cτ+ = 59 m c

  11. D+->K- ++geometrical and topological constrain

  12. Cut optimization M = 4.17 ·10-5 BR = 9.51 % χ2 = 5 σ Eff = 5.47 % S/B 2σ = 1.33 D+ = 20.7K per 1011central ev. S/B Efficiency χ2 = 9 σ Eff = 2.5 % S/B 2σ = 42.4 D+ = 10.8K

  13. D+ ->K-π+π+all cuts 25AGeV 2m2h4s 2m6s Eff = 1.84 % S/B 2σ = 1.4 7.1K D+ per 1011 central events M = 4.17 ·10-5 BR = 9.51 % 16K D+/1011 central ev.

  14. D+ ->K-π+π+ at 35 and 15 AGeV M = 2.67 ·10-4 BR = 9.51 % Eff = 5.64 % S/B 2σ = 15.6 D+=135K per 1011 central ev. M = 3.34 ·10-7 BR = 9.51 % Eff = 1.97 % S/B 2σ = 0.5 D+=62 per 1011 central ev. 15 AGeV 35 AGeV

  15. D0 ->K- - ++ topological constrain

  16. D0 ->K- - ++ (25 AGeV) 8.1109central events (300 central UrQMD) 3.2K D0 + 1K D0 per 1011 central events Systematic!

  17. + pK-+ c M<y=1> = 4.88·10-4 (A.Andronic) BR = 5% 10.7(4.4) K c+ per 1011 central events

  18. Summary and plans Fast (SIMDized) CA tracking works fine; D+K-+ +; +cpK-+ and D0K-+ +- looks very promising for the CBM experiment: collection rates about 16K D+, 32K D-, 3.2K D0, 1KD0, 4.4K+c per 1011 at 25 AGeV with excellent S/B ratio; next steps: More realistic Sts (cables and support structures) TOF particle ID including K-(+) identification; Ds detection possibility study; Open charm common trigger feasibility study.

More Related