Hi, Tancredi,
about the uncertainty estimations regarding 32 /47 degree spin
orientation, I think Genya is probably right, here is a detailed
estimation of error for the 11 bins
bin # 32(actual) 47(estimate)
1 0.013 0.010
2 0.013 0.010
3 0.016 0.013
4 0.020 0.017
5 0.024 0.021
6 0.033 0.029
7 0.046 0.042
8 0.070 0.062
9 0.102 0.091
10 0.147 0.128
11 0.336 0.289
So @ 47, generally the stat errors are 15-25% smaller than with 32 deg
setup with same number of events detected. 47 deg is less susceptible to
systematic errors in spin angle and tracking at high Q2, while more
sensitive at low Q2. 47 deg is also less sensitive to T21, since it has
higher loading in T20. average spin angle can be measured to +-0.6 deg
given enough data and polarization.
Chi
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