Hi, here is an update of T20 projection with estimation of systematic
errors displayed.
Again Yellow band represents the systematics due to angular resolution in
both electron scattering angle and targe spin angle. 1 degree used for
theta_e, 0.5 degree used for spin angle. there is certainly room for this
to improve.
Brown/reddish band represents the systematics due to 15% error in Pzz
normalization.
15% is a rather conservative estimation on the Pzz normalizatioin. Taking
difference of Tjon and Buchmann full models, at 1.58fm-1(Nikhef 96) the
difference is 20%. at 1.96fm-1 (Blast current lowest Q2) the difference is
25%.
we see both systematics decreases at higher Q2 which is in agreement with
the statement that 32 degree spin angle optimizes for high Q2 T20
measurement.
Chi
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