HES HKS meeting

1. HES HKS meeting 21/Apr/2011 T.Gogami

2. Contents • Stricter TDC cut of KTOF • Improvement • Analysis time • Number of Kaon • Check for all targets

3. DC hit info. selection with TOF Gravity CUT Particle direction ~17% Selective region Maximum gradient ~8% CUT Minimum gradient Procedure in “h_dc_tofcut.f” Get KTOF1X & 2X hit counter information Make combination of 1X and 2X hit counter if those two are in same group (grouping) Determine cut conditions on KDC1 & KDC2 Select Hit wires in KDC and Reorder them

4. Check works of the code KDC1 KDC2 v v’ v v’ uu’ uu’ • GREEN regionSelective region • RED markers & linesSelected hit wires • BLACK markers & lines Rejected hit wires particle particle x x’ x x’

5. KTOF TDC • Cut 10000 – 50000 (Current) 18000 – 20500 (New) Run 76314 for CH2 target Run 77124 for 52Cr target

6. Multiplicity improvement history Multiplicities just before tracking stage Original DC hit selection wit TOFs Stricter TDC cut of TOFs

7. Multiplicity improvement history Applied TDC cut Multiplicity went down ! • Analysis time • 20% reduction for 52Cr • Number of Kaon (RUN:77124, 52Cr) • 56  70  90  130 DC TOF cut Matrix DC TOF cut ‘ (TDC cut)

8. Checked KTOF TDC of all targets • Modified parameter files • e05115replay/PARAM/ • hhodo.param.75884 • hhodo.param.75886 • hhodo.param.75921 • hhodo.param.76092 • hhodo.param.76118 • hhodo.param.76376 • hhodo.param.76646 Correct coincidence window

9. Summary and to do • Summary • Stricter TDC cut of KTOFs • Stricter KDC hit wires selection • Analysis time : 20% reduction for 52Cr • Number of Kaon : 2 times more compared to rev.456 • Checked for all targets • To do • Λ’s Cross section check for CH2 and H2O targets • If consistent result shows up • Matrix • E05-115 • E01-011 • Tracking • Parameter optimization • Residual • Documents • RA • 授業料免除 • 学振 • Germany • Departure date : 6/May/2011

10. End 17/Apr/2011