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Viewing blog post - Rob's Analysis

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Some more analysis documents

posted by feuerbac on Mon 18 of Dec, 2006 [18:29 UTC]
So, a page about the usage and features of D.ctimeL1A has been added to the list of GEn pages. Primarily it tries to explain a number of the obvious bumps and wiggles in the D.bit3 and D.ctimeL1A distributions.

Also, a page about the Livetime calculations has been started, and more will be added as I figure out the most accurate and simplest ways to determine the DAQ and electronic livetimes for the experiment.

There will be a "howto do the GEn analysis" page started up sometime soon, that will link these different sections together. But for now, the stages in the analysis that have to be completed are:

  1. Calibrate a run period (BB optics, Neutron Detector, scintillators)
  2. "Replay" or process data from the run period
  3. Measure the raw neutron and proton asymmetries from the datafiles
  4. Remove (subtract) false asymmetries due to beam-charge asymmetry, DAQ and electronic livetime asymmetries
  5. Estimate and remove any "tracking efficiency" asymmetry
  6. Subtract the "dilution" of the proton's from the neutron sample, as well as backgrounds from the N2 (~ few percent) and windows (hopefully negligible)
  7. Now we have the real observed asymmetry?
  8. Using the target polarization get the physics asymmetry
  9. Account for the finite-acceptance to get the average Q2 and Aparallel, and then the ratio of GEn/GMn


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