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Run5 Analysis of RHIC-pC Polarimeter. RIKEN/RBRC Itaru Nakagawa Sept. 30, 2006. Contents. Kinematics Reconstruction source energy calibration Deadlayer energy correction Systematic error estimation(1) Polarization (1st Path Analysis Results) Online/Offline Event selection 2 /3 - PowerPoint PPT Presentation
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Run5 Analysis of RHIC-pC Polarimeter
RIKEN/RBRC
Itaru Nakagawa
Sept. 30, 2006
Contents Kinematics Reconstruction
source energy calibration Deadlayer energy correction Systematic error estimation(1)
Polarization (1st Path Analysis Results) Online/Offline Event selection 2/3 Strip by strip consistency sin() fit Systematic error estimation (2)
400keV
5.5MeV
Am Source Energy Calibration
Eloss(entrance window) = Eloss(foil) = Eloss(10-6 Vacuum) = 0
Ealpha = 5.486MeV
5.486 MeV (85%)
5.443 MeV (12%)
Other (<2%)
100% linearity of Attenuator
100% linearity of ADC
Linear Si Response w.r.t Depth
Fitting Error < 0.01%
~50keV/tic
Systematic Error is Negligible
Energy Correction (Stability)
Stability Error9 ~ 11 g/cm2
Stability Error9 ~ 11 g/cm2
Energy Correction (Strip by Strip Consistency)
Strip Number (72 Total )
Ene
rgy
Cor
rect
ion(g
/cm
2 )
•All Detectors are made from same wafers Any inconsistency should be accounted as sys
Energy Correction (Strip by Strip Consistency)
Systematic Error Summary(1)
Blue Yellow
Energy Calibration --- ---
strip-by-strip consistency
3.5 (1) 4.5 (2)
Event Selection 3 3
Stability 9.0 11.1
Total 10.1 (9.1) 12.3 (11.3)Ene
rgy
Cor
rect
ion
[ug/cm2]
( ):Relative Error
Online/Offline Polarization
AN(24GeV) AN(100GeV)AN(24GeV) AN(100GeV)
Event Selection Dependence
2 vs 3 Cut Consistency Systematic Error
2
3
Event Selection Error
Event Selection Error ~ 1%( was 3% in Run3,4)
Event Selection Error ~ 1%( was 3% in Run3,4)
€
δ a /b( ) = (a /b) (δa /a)2 − (δb /b)2
Strip by Strip Consistency ~ sin() fit ~
Azimuthal Angle Distribution
Strip by Strip Consistency Error
2 Distribution of sin() fit Well Distributed around 1 Evidence of Consistent Polarization Measurements by individ
ual strips No systematic error allocated
Systematic Error Estimate
Blue Yellow
Energy Scale 3% 4%
Event Selection 1% 1%
Polarization Profile
Normalization from Run4
8.5% 8.5%
Total 9% 9.5%This systematic error estimation is estimated based on Run4 Normalization
Road Map to Finalize the Analysis
Remaining Major Items Continue QA
Suspicious bunch, strips Study Off-Centered Target Measurements
Fill by Fill Analysis Polarization Profile
Normalization with Jet
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