survey of r04 data quality check of r04 conclusion checks of the r04 data quality outline jin yi may...
DESCRIPTION
4.Online data stat. VS. offline data stat. Online N h = N b = N = L on = 2788 nb -1 Offline N h = N b = N =15645 L off = 2364 nb -1 Online N h = N b = N = 7621 L on = 1305 nb -1 Offline N h = N b = N = L off = 1232 nb -1 Online N h = N b = N = 1125 L on = 65 nb -1 Offline N h =1532 N b =71641 N =1392 L off = 64 nb -1 VS ( Hadron R un: 238) ( Hadron R un: 361) ( Hadron R un: 94) Note: the data sample for 2.20 is small, so the data quality checks are mostly of 3.07 and Data quality checks for reliable physical analysis have been done.TRANSCRIPT
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• Survey of R04
• Data quality check of R04
• Conclusion
Checks of the R04 Data Quality
outlineJin Yi
May 25, 2004BES Annual Meeting JieXiu, Shanxi
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Survey of R04
1. The main goals of 2004 data taking are precise R measurement and QCD studying.
2. Data taking time is about 64 days.
3. Data were taken at 3.07, 2.60, 2.20GeV.
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4. Online data stat. VS. offline data stat.
OnlineNh = 103563Nb = 360350N = 12178L on = 2788 nb-1
OfflineNh = 34934Nb =1505506N =15645L off = 2364 nb-1
OnlineNh = 91255Nb = 276828N = 7621L on = 1305 nb-1
OfflineNh = 24900Nb = 1181177N = 13318L off = 1232 nb-1
OnlineNh = 21634Nb = 21000N = 1125L on = 65 nb-1
OfflineNh =1532Nb =71641N =1392L off = 64 nb-1
VS.
VS.
VS.
3.07 2.60 2.20(Hadron Run: 238) (Hadron Run: 361) (Hadron Run: 94)
Note: the data sample for 2.20 is small, so the data quality checks are mostly of 3.07 and 2.60.
5. Data quality checks for reliable physical analysis have been done.
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Data Quality Check Contents
• BES Global Stability
• Subdetector Information
MDC
TOF
BSC
• PID
• Inclusive decay channels
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BES Stability
Bhabha events:
• momentum-p VS. IIRUN
• deposited energy-ESUM VS. IIRUN
• dE/dx pulse height-PHMP8 VS. IIRUN
• modified dE/dx pulse height-PHMP11 VS. IIRUN
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3.07 2.60 2.20
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Brief Summary for Stability• The distributions of momentum and energy of
Bhabha events are fairly flat.
• Besides small fluctuations, the distribution of PHMP8 is flat too, and after offline modified, PHMP11 distribution is much flatter.
• These figures indicate that MDC and BSC are in good status during data taking.
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MDC Information
• Track fit quality—MFIT
• Vertex resolution
• Momentum resolution
• dE/dx resolution
• θ, Φ distribution
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MFIT-3.07
Distribution of vertex of hadronic events on r-Φ, r-z. The data with MFIT -19 won’t be used in physical analysis.
MFIT=2
MFIT=-19
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MFIT-2.60
Distribution of track vertex of hadron events on r-Φ, r-z
MFIT=2
MFIT=-19
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MFIT-2.20
Distribution of track vertex of hadron events on r-Φ, r-z
MFIT=2
MFIT=-19
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MFIT=2 for 3.07, 2.60
(a) PHMP11 VS. p for hadronic events (b) beta VS. p for hadronic events
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Vertex resolution-3.07, 2.60
Distribution of Bhabha events vertex on r-Φ, r-z
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Momentum resolution-3.07, 2.60
α = 1.5%
α = 1.6%
(a) Distribution of momenta for Bhabha events (b) momenta VS.Φ (c) momenta resolution VS.Φ
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dE/dx resolution-3.07, 2.60
Distribution of PHMP11 for Bhabha events
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dE/dx resolution-3.07, 2.60, 2.20
Between 50~70o, there is the offset of χse value. It is because that for the leak currents in layer-7 and 9 of MDC, HV is reduced to 80%.
Distribution of χse on Φ
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θ, Φ Distribution-3.07
Angular-θ, Φ distribution for Bhabha events
normal normal
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TOF Information-3.07, 2.60
The fight time resolution for Bhabha events is about 200ps, and the offset is very limited.
Fight time VS. Φ
ΔT(=Tmea-Tex
p) VS. Φ
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BSC Information-3.07, 2.60
(a) Deposited Energy Measurement VS. Φ for 3.07 (b) Deposited Energy Resolution VS. Φ
α = 24%
Distribution of deposited energy of Bhabha events
α = 24%
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Electron-TOF
Distribution of Tmea-Texp in different momentum range. The offset is very limited.
0.6<p<0.8
0<p<0.25 0.25<p<0.4
0.4<p<0.5 0.5<p<0.6
0.8<p<1.2
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Electron-dE/dx
Distribution of χse in different momentum range. The offset is only 0.1.
0<p<0.25 0.25<p<0.4
0.4<p<0.5 0.5<p<0.6
0.6<p<0.8 0.8<p<1.2
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K Sample
K sample is selected from 2(Kπ). The offsets of TOF and dE/dx are about 0.
Data sample is pure.
(b) Momentum distribution of K(a) Invariant mass of Kπ
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π sample
π sample is selected from inclusive K0s. The offsets are very limited.
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Inclusive decay channels-K0
The sample of inclusive K0 at different CM energies (3.07, 2.60, 2.20).
fit mass value = 497MeV
total
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Inclusive decay channels-K*0
The sample of inclusive K*0 at different CM energies (3.07, 2.60, 2.20).
total
fit mass value = 892MeV
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Inclusive decay channels-Λ(Λ)
The sample of inclusive Λ(Λ) of total.
fit mass value= 1115.2MeV
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Conclusion for data quality check
• As a whole, the detector is in good status during data taking.
• We have large data sample at 3.07, 2.60 and 2.20GeV.
• The data is of high reliability and quality.