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Run III Final Moller Results

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

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Run III Final Moller Results

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  1. E158 Collaboration Meeting JLab June, 2004 Waled Emam Syracuse University Run III Final Moller Results

  2. 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

  3. - 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 Data (2003 & 2004) Yury reprocessed the data in April 2004. He made significant changes in the way that some cuts are applied. This led to significant changes in the Moller asymmetry value.

  4. Shown difference in number of events & RMS for the two data sets of 2003 and 2004* * 2003 refers to the data processing that took place in Dec. 2003 while 2004 refers to the reprocessing that took place in Apr. 2004

  5. Shown Moller asymmetry for the two data sets of 2003 and 2004*

  6. Monopole Asymmetry Grand Moller asymmetry per slug & per run. Grand Asymmetry = 17.7 +/- 14.9 ppb Total Correction = 2.9 +/- 38.4 ppb Chi^2= 41/36

  7. Rings comparisons

  8. Energy & HWP comparisons

  9. Timeslot comparisons

  10. Energy & HWP comparisons for each ring

  11. 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

  12. IN dipole

  13. MID dipole

  14. OUT dipole

  15. Azimuthal asymmetries per ring

  16. Beam Corrections Beam corrections per slug Total beam asymmetries & slopes & correctins

  17. Beam slopes per slug Beam asymmetries per slug

  18. Beam corrections per ring Q dX X dY E Y

  19. Monopole & Dipole corrections per ring

  20. First-Order Systematics Error = Corr. * Suppression The total error is the quadratic sum of all above errors How did we get this ?

  21. 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

  22. The timeslot analysis is so powerful! Timeslot analysis The biggest suppression occurs for Energy

  23. Beam False Asymmetries Error = Slope. * Suppression The total error is the direct sum of all above errors How did we get this ?

  24. How did we get 36.0 % suppression factor on angle X ? 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. C1, C2 refer to the calibration constants X_agr is the BPM agreement on angle X. Systematic error on beam false asymmetry is less than 1 ppb.

  25. Comparing Regression with Dithering Difference between regression and dithering is ~1 ppb.

  26. Moller grand asymmetries for dithering and regression

  27. Regression & Dithering IN

  28. Regression & Dithering MID

  29. Regression & Dithering OUT

  30. Conclusion • Total of 154.51 MPafter cuts. • Considering the regression set, the blinded Moller asymmetry is 17.7 +/- 14.9ppb with total correction 2.9 +/- 38.4ppb. • 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.

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