Muon tagger

Eun-Ju JeonOctober 11, 2007

For MC analysis group

PMT position - typeIII

Tyvek

vetoair

PMT position – type I, II

8 inch PMT installed on outside wall of Buffer

- top: 12 (격자형태 )- side: 27 (3 rings)- bottom: 12 (격자형태 )

8 inch PMT installed on inside wall of Veto- top: 12 (격자형태 )- side: 27 (3 rings)- bottom: 12 (격자형태 )

Z=0

Z=2054

Z=-2054

Z=500

Z=-500

PMT position – IIPMT position – I

Muon tracks It generates muon tracks with a cos2 distribution of directions at (0,0,4750)

px

py

pz

-20GeV

-20GeV

-20GeV

20GeV

20GeV

phi

theta

track

Tyvek

vetoair

(0,0,4750)

Muon tagging efficiency (I, II, III)

PMT position - I PMT position - II PMT position – III

Gen.

Reconstructed

Tagging efficiency

Gen.

ReconstructedTagging efficiency

Gen.

Reconstructed

Tagging efficiency

Pass through Air

only13 nclst=0 13 0% 12 nclst=0 12 0% 13 nclst=0 13 0%

Pass through

Veto only

180

nclst=0 7nclst=1 40nclst>=2 133

(96.1%)

73.9%

177nclst=0 12nclst=1 22nclst>=2 143

(93.2%) 80.8%

168nclst=0 10nclst=1 8nclst>=2 150

(94.0%)89.3%

Pass through

Buffer only

275

nclst=1 2nclst>=2 273

(100%)

99.3%310

nclst=1 1nclst>=2 309

(100%) 99.7%

325nclst=1 2nclst>=2 323

(100%)99.4%

pass through Catcher, target

532

nclst=1 9nclst>=2 523

(100%)

98.3%501

nclst=1 1nclst>=2 500

(100%) 99.8%

494nclst=1 7nclst>=2 487

(100%)98.6%

total 1000

nclst=0 20nclst=1 51nclst>=2 929

(98%) 92.9%

1000

nclst=0 24nclst=1 24nclst>=2 952

(97.6%) 95.2%

1000

nclst=0 23nclst=1 17nclst>=2 960

(97.7%) 96.0%

Before improvement

Results of vertex resolution: using PMT position II (old version)

x0-x0’ y0-y0’ z0-z0’

x1-x1’ y1-y1’ z1-z1’

Muons that pass through buffer and catcher region: nclst >= 2

Mean: -6.545RMS: 261.9

Mean: -26.1RMS: 276.9

Mean: -45.42RMS: 1366

Mean: -19.61RMS: 1388

[mm] [mm] [mm]

[mm] [mm] [mm]

Results of vertex resolution: using PMT position III (old version)

x0-x0’ y0-y0’ z0-z0’

x1-x1’ y1-y1’ z1-z1’

Muons that pass through buffer and catcher region: nclst >= 2

Mean: -50.28RMS: 1734

Mean: -68.66RMS: 1667

[mm] [mm] [mm]

[mm] [mm] [mm]

After improvement (what is changed?)

• Select entering and outgoing clusters – nCluster>=2 인 경우

• Cluster 의 평균시간이 가장 빠른 cluster 를 entering cluster 로 정하고 , 가장 느린 cluster 를 outgoing cluster 로 정함 .

Cluster 를 구성하는 hitPMT 들의 평균시간대신에 각각의 cluster 에서 charge 가 가장 큰 hitPMT 들의 시간을 비교하여 가장 빠른 시간의 hitPMT 를 포함하는 cluster 를 entering cluster 로 정하고 ,

나머지 cluster 들 중에서 charge 가 가장 큰 hitPMT 를 포함하는 cluster 를 outgoing cluster 로 정했음 .

• Find entering position and outgoing postion– entering position : entering cluster 를 구성하는 hitPMT 들의 position 과 hitPMT_

charge 를 이용해서 전하중심점을 entering position 으로 정함 . 동일함 .

– outgoing position : outgoing cluster 를 구성하는 hitPMT 중에서 hitPMT_charge가 가장큰전하의 1/10 보다는 크고 , hitPMT_time 이 가장 작으나 entering cluster 의 time 보다는 큰 hitPMT 의 위치를 outgoing position 으로 정함 .

entering position 과 같은 방법을 사용했음 .

Results of vertex resolution: using PMT position I (improved)

x0-x0’ y0-y0’ z0-z0’

x1-x1’ y1-y1’ z1-z1’

Muons that pass through buffer and catcher region: nclst >= 2

Entry; 796Mean: 23.8RMS: 279.9

Entry: 796Mean: 3.9RMS: 264.0

Entry: 796Mean: -67.3RMS: 748.7

Entry: 796Mean: -20.3RMS: 810.2

[mm] [mm] [mm]

[mm] [mm] [mm]

Entry: 796Mean: 93.2RMS: 598.8

Entry: 796Mean: 1124RMS: 1149

Results of vertex resolution: using PMT position II (improved)

x0-x0’ y0-y0’ z0-z0’

x1-x1’ y1-y1’ z1-z1’

Muons that pass through buffer and catcher region: nclst >= 2

Entry; 809Mean: 21.7RMS: 225.6

Entry: 809Mean: -72.8RMS: 235.6

Entry: 809Mean: -61.6RMS: 726.9

Entry: 809Mean: 83.9RMS: 636.5

[mm] [mm] [mm]

[mm] [mm] [mm]

Entry: 809Mean: -57.9RMS: 384.9

Entry: 809Mean: 1108RMS: 1050

Results of vertex resolution: using PMT position II (improved: pick up PMT for

outgoing)

x0-x0’ y0-y0’ z0-z0’

x1-x1’ y1-y1’ z1-z1’

Muons that pass through buffer and catcher region: nclst >= 2

Entry; 809Mean: 21.7RMS: 225.6

Entry: 809Mean: -72.8RMS: 235.6

Entry: 809Mean: -58.7RMS: 671.9

Entry: 809Mean: 75.0RMS: 624.2

[mm] [mm] [mm]

[mm] [mm] [mm]

Entry: 809Mean: -57.9RMS: 384.9

Entry: 809Mean: 1049RMS: 1000.

Results of vertex resolution: using PMT position III (improved)

x0-x0’ y0-y0’ z0-z0’

x1-x1’ y1-y1’ z1-z1’

Muons that pass through buffer and catcher region: nclst >= 2

Entry; 810Mean: 45.5RMS: 897.5

Entry: 810Mean: 15.2RMS: 809.5

Entry: 810Mean: -134.1RMS: 1012

Entry: 810Mean: 36.9RMS: 875.2

[mm] [mm] [mm]

[mm] [mm] [mm]

Entry: 810Mean: 680.6RMS: 1070

Entry: 810Mean: 2.187RMS: 1320

Summary