run iii final moller results
DESCRIPTION
E158 Collaboration Meeting JLab June, 2004 Waled Emam Syracuse University. Run III Final Moller Results. Outline. Data (2003 & 2004) Moller Detector Results Monopole Asymmetry Azimuthal Dependence in Moller Detector Beam Corrections First-Order Beam Systematics Beam False Asymmetries - PowerPoint PPT PresentationTRANSCRIPT
Run III Final Moller Results
E158 Collaboration MeetingJLab
June, 2004
Waled EmamSyracuse University
Outline● Data (2003 & 2004)● Moller Detector Results
– Monopole Asymmetry– Azimuthal Dependence in Moller Detector
● Beam Corrections– First-Order Beam Systematics– Beam False Asymmetries– Comparing Regression and Dithering
Data (2003 & 2004)
- 37 Slugs: 15 Slugs at 45 GeV 22 Slugs at 48 GeV - Number of runs is 1010.- Number of Events is 154.5 MP - For the resluts shown in this talk : MollerEstat weights Moller = IN + MID + OUT Blinded
Yury reprocessed the data in April 2004. He made significant changes in the way that some cuts are applied. This led to significantchanges in the Moller asymmetry value.
* 2003 refers to the data processing that took place in Dec. 2003 while 2004 refers to the reprocessing that took place in Apr. 2004
Shown difference in number of events & RMS for the two data sets of 2003 and 2004*
Shown Moller asymmetry for the two data sets of 2003 and 2004*
Grand Moller asymmetryper slug & per run.
Monopole Asymmetry
Grand Asymmetry = 17.7 +/- 14.9 ppb Total Correction = 2.9 +/- 38.4 ppb Chi^2= 41/36
Rings comparisons
Detector Chi^2/ndf
IN 43/36
MID 40/36
OUT 86/36
Energy & HWP comparisons
Timeslot comparisons
Energy & HWP comparisons for each ring
Azimuthal Dependence in Moller Detector
Shown is the azimuthal asymmetry per channel for the Moller detector rings using the longitudinal 48GeV & 45GeV data in Run III
INdipole
MIDdipole
OUTdipole
Detector Monopole (ppb) Xdipole (ppb) Chi^2/ndf Ydipole (ppb) Chi^2/ndf
IN 15.8 +/- 24.5 -58.9 +/- 30.9 45/36 -7.9 +/- 28.6 80/36
MID 26.7 +/- 19.4 -48.2 +/- 25.4 34/36 30.6 +/- 22.8 97/36
OUT 4.8 +/- 26.9 -112 +/-38.8 142/36 110 +/- 35.5 211/36
Azimuthal asymmetries per ring
Beam Corrections
Parameter Beam Asymmetry Slopes Correction (ppb)
Q 73.7 +/- 287 ppb 0.002 ppb/ppb -0.6 +/- 2.0
E -2.3 +/- 1.9 KeV -17.58 ppb/KeV 24.2 +/- 38.2
X -9.3 +/- 5.9 nm -0.18 ppb/nm -10.5 +/- 2.5
Y 12.1 +/- 5.9 nm -0.58 ppb/nm -20.3 +/- 5.4
dX -0.0 +/- 0.2 nard 16.38 ppb/nrad 6.8 +/- 4.8
dY 0.2 +/- 0.1 nrad 18.45 ppb/nrad 3.2 +/- 4.3
Total - - 2.9 +/- 38.4
Beam corrections per slug
Total beam asymmetries & slopes & correctins
Beam slopes per slug
Beam asymmetries per slug
Beam corrections per ring
Q
E
X
Y
dX
dY
Detector Asymmetry (ppb) Total Correction (ppb)
Moller monopole 17.7 +/- 14.9 2.9 +/- 38.4
In monopole 15.8 +/- 24.5 51.0 +/- 51.0
Mid monopole 26.7 +/- 19.4 49.6 +/- 64.
Out monopole 4.8 +/- 26.9 -159.0 +/- 42.3
Monopole & Dipole corrections per ring
In dipole X -58.9 +/- 30.9 57.6 +/- 28.0
Mid dipole X -48.2 +/- 25.4 244.9 +/- 87.4
Out dipole X -111.8 +/- 38.8 154.9 +/- 150.4
In dipole Y -7.9 +/- 28.6 -52.3 +/-17.9
Mid dipole Y 30.6 +/- 22.8 133.2 +/- 94.
Out dipole Y 110.1 +/- 35.5 405.1 +/- 161.6
Parameters Corr. (ppb) Suppression Error (ppb)
Q -0.6 - 0.0
E 24.2 2.58% 0.63
X -10.5 2.04% 0.22
Y -20.3 3.57% 0.73
dX 6.8 8.44% 0.58
dY 3.2 4.69% 0.15
TOTAL 2.9 - 1.15
First-Order Systematics
The total error is the quadratic sum of all above errors
Error = Corr. * Suppression
How did we get this ?
How did we get 2.58 % suppression factor on energy E ?
1- We first calculate the following ratio per slug for E:
2- Plot the above value verses slug number
3- Take the error on the above average from the plot the average. This is the suppression factor on E.
4- Similarly we calculated the other suppression factors.
0,1 refer to the two timeslots
Syst. Error (ppb)
0.0
0.63
0.22
0.73
0.58
0.15
1.15
Jitter Error (ppb)
2.0
38.2
2.5
5.4
4.8
4.3
38.4
Parameters
Q
E
X
Y
dX
dY
TOTAL
Timeslotanalysis
The timeslot analysis is so powerful!
The biggest suppression occurs for Energy
Parameter Regression Slope Suppression Error (ppb)
Energy -17.58 ppm/KeV 4.4% -0.77
Angle X -16.38 ppm/urad 36.0% -0.12
Angle Y 18.45 ppm/urad 21.5% 0.08
Target X -0.018 ppm/um 16.2% -0.02
Target Y -0.58 ppm/um 6.8% -0.04
TOTAL - - -0.87
Beam False Asymmetries
Error = Slope. * Suppression
The total error is the direct sum of all above errors
How did we get this ?
1- We first calculate the following quantity for angle X:
2- Take the error on the above value. This is the suppression factor on angle X. 3- Similarly we calculated the other suppression factors.
How did we get 36.0 % suppression factor on angle X ?
C1, C2 refer to the calibration constantsX_agr is the BPM agreement on angle X.
Systematic error on beam false asymmetry is less than 1 ppb.
Comparing Regression with Dithering
Difference between regression and dithering is ~1 ppb.
Regression Dithering
Grand Asymmetry (ppb) 15.8+/-15.1 16.8 +/- 15.7
Total Correction (ppb) -1.3+/- 38.7 -2.3 +/- 39.0
Parameter Beam Asymmetry Reg. Correction (ppb) Dit. Correction (ppb)
Q 60.5 +/- 290 ppb -0.5 +/- 2.0 -3.2 +/- 3.5
E -1.7 +/- 1.9 KeV 20.5 +/- 38.6 25.4 +/- 39.4
X -8.2 +/- 5.9 nm -10.3 +/- 2.5 -5.3 +/- 2.7
Y 12.1 +/- 6.0 nm -20.5 +/- 5.4 -25.1 +/- 6.6
dX -0.0 +/- 0.2 nrad 6.7 +/- 4.8 1.5 +/- 6.0
dY 0.2 +/- 0.1 nrad 2.8 +/- 4.3 4.3 +/- 5.3
Total - -1.3 +/- 38.7 -2.3 +/- 39
Moller grand asymmetries for dithering and regression
Regression & Dithering IN
Regression & Dithering MID
Regression & Dithering OUT
Total of 154.51 MP after cuts.
Considering the regression set, the blinded Moller asymmetry is 17.7 +/- 14.9 ppb with total correction 2.9 +/- 38.4 ppb.
Considering the dithering & regression set, the blinded Moller asymmetry is 16.8 +/- 15.7 ppb and 15.8 +/- 15.1 ppb respectively with a difference ~1 ppb.
The First-Order Beam Systematic error is: 1.15 ppb for regression.
Less than 1 ppb systematic error due to false beam asymmetry.
Conclusion