3He(e,e'd) Asymmetries
Consistency checks:
I have three sets of data, taken at different Q**2 and different \theta_{pq}.
This week I was trying various cuts to check if the data are consistent. I performed
various \theta_{pq} and \phi_{pq} cuts to get BB=82deg results from BB=75deg results.
These cuts still cause me some problems. Later I also applied various Q**2 cuts
to come from HRSL=12.5deg data to HRSL=14.5deg data. This seems to be working
well. I used longitudinal data (best statistics), to perform these checks:
\theta_{pq} and \phi_{pq} cuts:
BB=75deg data:
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BB=82deg data:
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Comparison:
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Q**2 cuts
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Q**2 <0.3 (GeV/c)**2:
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0.3 < Q**2 <0.33 (GeV/c)**2:
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0.33 < Q**2 <0.36 (GeV/c)**2:
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Q**2 >0.36 (GeV/c)**2:
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Elastic Proton asymmetry:
I am trying to get the same value of the proton polarization for both sets of data.
As an additional check I plotted form-factor ratio. I believed that with this
test I could check if the observed discrepancy is a result of beam/target polarization
issues or a results of not properly reconstructed asymmetries. Unfortunately I realized
that the error bars on these ratios are very large. Because of that I can not draw any
serious conclusion from this ratio.
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I have also been joining data points at low missing momentum (up to 0.1GeV/c), but
results were still not consistent. Only absolute asymmetries were smaller.
I also had some worries, that this is not a legitimate procedure, since the majority of
our data points lie below p_miss < 0.1GeV/c
Next week:
- Analyze the rest of the 12.5 data without compression. This takes a while,
because files are large.
- Make checks (Q**2 cuts etc.) on these data.
- Plot asymmetries as a function of BB momentum
Last modified: 10/12/11
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