S-2S Wiki

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• Missing mass resolution simulation with CH₂ target
  • Effect of Ξ^- and decayed particles from Ξ^- on the energy loss correction of missing mass. –> Correction seems to be impossible.
• will start designing WC detectors, and frame of WC and TOF detectors.

• S-2S official web page was updated.
• S-2S Wiki:
  • Edit can be done by only core members (Nagae, Gogami, Kanatsuki, Takenaka) so far.
• Acceptance map for generation points (x,y and z) around target region were shown as histograms.
• Momentum resolution with drift chambers (simulation)
  • No wires: FWHM = 5.5 × 10^-4
  • W plate (0.1 μm) : FWHM = 5.7 × 10^-4 (thought to be realistic case)
  • W plate (1 μm): FWHM = 6.3 × 10^-4 (comparable level to the case with fiber detector)
  • W plate (10 μm): FWHM = 12 × 10^-4
• About SDC2:
  • If SDC2 is used with rotation of 90 degrees, x-position resolution is deteriorated (σ_x = 0.2 mm → 1.1 mm). –> Δp/p = 7.7 × 10^-4 (This result is worse than that of our intuition. Need to be checked.)
• Required sizes for drift chambers:
  • SDC1: 75 × 125 mm²
  • SDC2: 95 × 240 mm²
  • SDC3: 800 × 400 mm²
  • SDC4: 920 × 550 mm²
• Detector lists
• Schedule for preparation

• Analyses of data of prototype WC detector, which were taken at ELPH
  • x,y-position dependence were shown.
  • Position dependences were smaller than those of Geant4 simulatin. –> will use the Geant4 simulation by himself with Kanatsuki-kun's support.
• Preparation for presentations in Atagawa and Hawai meeting.
  • Rough overview will be prepared by next week.

• Indian summer school in Prague, Czech Republic (9/3 - 9/7)
• Next S-2S regular meeting: TBD ( 9/16(火) 10:30- ? )
• Workshops at Atagawa (9/23-25) (9/25-27)