Calculation of hit efficiency

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# Calculation of hit efficiency - PowerPoint PPT Presentation

Calculation of hit efficiency Yukio FUJIYAMA (Tokyo Tech) 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

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### Calculation of hit efficiency

Yukio FUJIYAMA (Tokyo Tech)

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

Flow of tracking

Exp No.38,Exp No.30

interpolate

My works

The details are the next page…

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.

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-
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

Hit efficiency study

Residual distribution

residual_exp38.ps

residual_exp30.ps

Cluster distribution on DSSD

cluster_ditribution_exp38.ps

cluster_distribution_exp30.ps

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.