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12 th CBM Collaboration Meeting October 13-18, 2008, JINR, Dubna

12 th CBM Collaboration Meeting October 13-18, 2008, JINR, Dubna. Feasibility study of the straw tube detector option for some MUCH stations. A. Zinchenko 1 (L.Naumann 2 , D.Peshekhonov 1 , V.Peshekhonov 1 ) 1 VBLHEP , JINR, Dubna 2 Forschungszentrum Dresden-Rossendorf , FZD. Outline.

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12 th CBM Collaboration Meeting October 13-18, 2008, JINR, Dubna

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  1. 12th CBM Collaboration MeetingOctober 13-18, 2008, JINR, Dubna Feasibility study of the straw tube detector option for some MUCH stations A. Zinchenko1 (L.Naumann2, D.Peshekhonov1, V.Peshekhonov1) 1VBLHEP, JINR, Dubna 2Forschungszentrum Dresden-Rossendorf, FZD

  2. A.Zinchenko Outline MC Reconstruction Some performance numbers Summary and outlook

  3. A.Zinchenko Geometry Tube diameters: 4, 4, 4, 4 mm; σdrift = 0.2 mm 6 layers per station arranged in 3 doublets: Y, U (+10o), V(-10o)

  4. A.Zinchenko Straw tube occupancy for Au-Au @ 25 GeV

  5. A.Zinchenko Straw tube occupancy for Au-Au @ 25 GeV

  6. A.Zinchenko Track reconstruction • Makes use of L1 Kalman Filter framework (CbmL1SttTrackFinder) • Starts from STS tracks • Tracking strategy: extrapolate track to STT plane and select hits around track with χ2 < 20 (100) • Track accepted if contains hits from all STT doublets

  7. A.Zinchenko Tracking efficiency • Reference tracks: muon tracks from J/ψfound in STS and passing through all layers of STT (producing STT MC points with given MC track ID)

  8. χ2-cut 3 stations 4 stations 3 stations (hit merging) 4 stations (hit merging) 20 1118 / 1194 = 93.6 % 1113 / 1185 = 93.9 % 1113 / 1194 = 93.2 % 1106 / 1185 = 93.3 % 100 1166 / 1194 = 97.7 % 1165 / 1185 = 98.3 % 1166 / 1194 = 97.7 % 1165 / 1185 = 98.3 % J/ψ to dimuon @ 25 GeV w/out background A.Zinchenko

  9. χ2-cut 3 stations 4 stations 3 stations (hit merging) 4 stations (hit merging) 20 1120 / 1195 = 93.7 % 1107 / 1183 = 93.6 % 1110 / 1195 = 92.9 % 1063 / 1183 = 89.9 % 100 1162 / 1195 = 97.2 % 1160 / 1183 = 98.1 % 1162 / 1195 = 97.2 % 1157 / 1183 = 97.8 % J/ψ to dimuon + central Au-Au @ 25 GeV A.Zinchenko

  10. A.Zinchenko Summary • STT occupancy inside MUCH is below 10% in stations 4-6 for central Au-Au for 25 GeV/c • first track reconstruction results from STS seeds (without MUCH tracking) look promising both for 3 and 4 STT stations

  11. A.Zinchenko Outlook • realistic STT geometry • STT software • performance with MUCH tracks

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