1. Run5 Analysis of RHIC-pC Polarimeter
RIKEN/RBRC
Itaru Nakagawa
Sept. 30, 2006

2. 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)

3. Am  Source Energy Calibration
Assumptions
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
400keV
5.5MeV
~50keV/tic
Systematic Error is Negligible
Fitting Error < 0.01%

4. Energy Correction (Stability)
Stability Error
9 ~ 11 g/cm2

5. Energy Correction (Strip by Strip Consistency)
Strip Number （７２ Total）
Energy Correction(g/cm2)
All Detectors are made from same wafers
 Any inconsistency should be accounted as sys

6. Energy Correction (Strip by Strip Consistency)

7. Systematic Error Summary(1)
Blue
Yellow
Energy Calibration
---
strip-by-strip consistency
3.5 (1)
4.5 (2)
Event Selection 3
Stability
9.0
11.1
Total
10.1 (9.1)
12.3 (11.3)
Energy Correction
[ug/cm2]
( ):Relative Error

8. Online/Offline Polarization
AN(24GeV) AN(100GeV)

9. Event Selection Dependence3 2
2  vs 3  Cut Consistency  Systematic Error

10. Event Selection Error ~ 1%
( was 3% in Run3,4)

11. Strip by Strip Consistency ~ sin() fit ~

12. Azimuthal Angle Distribution

13. Strip by Strip Consistency Error
2 Distribution of sin() fit
Well Distributed around 1
Evidence of Consistent Polarization Measurements by individual strips
No systematic error allocated

14. Systematic Error Estimate
Blue
Yellow
Energy Scale 3% 4%
Event Selection 1%
Polarization Profile
Normalization from Run4
8.5%
Total 9%
9.5%
This systematic error estimation is estimated based on Run4 Normalization

15. 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