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HAPPEX Collaboration Meeting Summary – December 2005

The HAPPEX Collaboration Meeting held on December 3, 2005, provided updates on run summaries for helium and hydrogen experiments. Scheduled and actual run times, along with beamline commissioning details, were discussed. The helium run was scheduled for approximately 800 hours, delivering around 1000 hours of operations, while hydrogen scheduled for 450 hours delivered about 580 hours. Background studies, including asymmetry measurements and noise characterization, were presented, revealing important insights into correlated noise and statistical errors in the physics asymmetry results for both helium and hydrogen.

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HAPPEX Collaboration Meeting Summary – December 2005

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  1. 2005 HAPPEX Run Summary Kent Paschke HAPPEX Collaboration Meeting December 3, 2005

  2. Run Summary Helium Scheduled: 48 days July 9 – Aug 7 Aug 7 – Aug 31 Actual: 55 days July 28 – Sept 1 Sept 9 – Sept 27 • Late start due to • installation • sweeper/septum and spectrometer commissioning • beamline commissioning ~18 day “parasitic” extension was very important Hydrogen Scheduled: 39 days Oct 15 – Nov 23 Actual: 36 days Oct 16 – Nov 21 Last day for PREx tests Kent Paschke HAPPEX Collaboration Meeting

  3. Run Summary Helium Scheduled:~800 hours Delivered: ~1000 hours Actual: Good pairs: ~34M ~630 hours (+ background studies, calibration, etc) Total Charge: 79.7 C P2Q*L ~ 35% (not counting 2004) Hydrogen Scheduled:~450 hours Delivered: ~580 hours Actual : Good pairs: ~24M ~440 hours (+ background studies, calibration, etc) Total Charge: 86.7 C P2Q*L ~ 59% (not counting 2004) Kent Paschke HAPPEX Collaboration Meeting

  4. Online Raw Asymmetry Helium Hydrogen Kent Paschke HAPPEX Collaboration Meeting

  5. Background Studies Helium • Al Background • ~1.8% • Integrating + Counting measurement • Inelastic spectra • Dipole scan for rescattering probability • Total: ~ 4 shifts? • Likely results: <2% He QE, ~1.8% Al, <0.6% rescatter Hydrogen • Al Background • ~0.7% • Integrating + Counting measurement • Inelastic spectra • Dipole scan for rescattering probability • Total: ~ 3 shifts? • Likely results: ~0.7% Al, <0.2% rescatter Kent Paschke HAPPEX Collaboration Meeting

  6. Transverse Asymmetry Helium • PV ~ 3%, AT ~ 13 ppm -> suggests 0.8 ppm difference • AL – AR is large (0.9 ppm) • Sign is correct! Hydrogen • PV < 2%, Aperp ~ 6.5 ppm • AL – AR is small Kent Paschke HAPPEX Collaboration Meeting

  7. Correlated Noise Helium AL–AR RMS = 1912 ppm “True” width ~ 956 ppm Average width ~ 1047 ppm Correlated noise ~ 430 ppm Double Difference suggests BCM noise <70 ppm Likely culprit: Density Fluctuations Hydrogen AL–AR RMS = 1066 ppm “True” width ~ 533 ppm Average width ~ 537 ppm Correlated noise ~ 65 ppm Double Difference suggests BCM noise ~ 56 ppm Kent Paschke HAPPEX Collaboration Meeting

  8. Polarimetry Results Helium Hydrogen Kent Paschke HAPPEX Collaboration Meeting

  9. Physics Asymmetry Helium 2004: APV: s ~ 0.21 ppm (3.5%) APV: s ~ 0.84 ppm (11.2%) GEs: s ~ 0.014 GEs: s ~ 0.042 Hydrogen 2004: APV: s ~ 0.24 ppm (17%) APV: s ~ 0.12 ppm (8%) GEs+0.080GMs:s ~ 0.025 GEs+0.084GMs: s ~ 0.012 NOTE: Statistical error only! Systematic error will likely increase Helium error bar by ~40%, and Hydrogen by about 25% Kent Paschke HAPPEX Collaboration Meeting

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