S-2S Wiki

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.