Calculation of hit efficiency

1. Calculation of hit efficiency Yukio FUJIYAMA (Tokyo Tech)

2. Hit efficiency study Definition Number of the intersections of tracks (RawData (cosmic) -> CDC tracking -> interpolate -> SVD tracking) with layers →denominator Coincidence of clusters in table (RecSVD_Cluster) →numerator

3. Flow of tracking Exp No.38,Exp No.30 interpolate My works The details are the next page…

4. Number of hits From CDC (interpolate) Tracking on SVD(1) • Number of hits ≧ 4 • Hits mean the intersections of tracks (from CDC) with layers. • Associate hits with clusters in table (RecSVD_cluster) • Residual x , y < 0.9 cm • Residual z < 5 cm • Absolute value of cluster energy > 8000 e- • Evaluate track parameters with these clusters.

5. Number of hits From track parameters I evaluate Tracking on SVD(2) • Number of hits > 4 • Hits mean the intersections of tracks (with the track parameters I evaluate) with layers. • Mask the layer that we wanted to know hit efficiency. • Associate hits with clusters in table (RecSVD_cluster) • Residual x, y, z < 0.07 cm • Absolute value of cluster energy > 8000 e-

6. Hit efficiency study Analysis sample Exp No.38 run7~28 Cosmic-Ray without magnetic field, 300,000events Exp No.30 run77~128 Cosmic-Ray without magnetic field, 200,000events

7. Hit efficiency study Residual distribution residual_exp38.ps residual_exp30.ps Cluster distribution on DSSD cluster_ditribution_exp38.ps cluster_distribution_exp30.ps

8. Summary • Compare hit efficiency in exp38 to that in exp30. • These are consistent. • Third layer efficiency seemed to be improved. • What happened ? • There is no hole in the cluster positions. • Mupair event only have…? • Try to calculate hit efficiency with cosmic-ray with magnetic field.