People,
Quick question (maybe to Ernie or Genya). Is this the first time we are
running without any other problems (tofs, etc.) with a cold inlet tube?
Could there have been an issue of a polarization loss due to a warm
inlet? Have run polarized D2 or H2 after the crack in the cell was
discovered? I'm just grabbing at straws here trying to explain such a
jump in a target polarization.
Cheers,
Vitaliy
Chi Zhang wrote:
>Hi Michael, Genya and all.
>
>I apolagive first that I need to make a correction on the plots I sent out
>last night on the experimental Asymmetry. Just now, I found that my code
>was left in the state to project error bars for the rest of the year so
>error bars in the plot last night are dramtically shrinked.
>
>Please see the atatched figure again this time for the correct error
>bars. And the Pzz fitted with corrected statistical errors are
>essentially same in value as last night but with larger (more reasonable)
>statistical errors:
>
>parallel kinematics: 52+-12%
>perpendicular kinematics: 62+-7%
>combined: 56.9+-6.5%
>
>THE PLOT SHOWS THAT THE 3RD DATA POINT IN Q2 IS ONLY SLIGHTLY MORE THAN
>1-SIGMA OFF THE FIT.
>
>Fitting only the first two points gives 52+-8%. Either way, it is much
>better than ever before. (40cm47deg: 42%, 60cm/47deg 27%, 60cm/32deg 36%)
>
>So it seems to me that: ed elastic data is still consistant with itself in
>the range of Q2<0.3(GeV/c)^2. tensor polarization is very high, as is
>vector polarization(Vitaliy). But I don't have the knowledge to determine
>if it is TOO GOOD TO BE TRUE. Maybe some magic happened during the
>holiday. :)
>
>In the mean time, spin angle that yields the best fit for left and right
>sector seems to be below slightly 30 degree. Not enough stat to determine
>this precisely yet.
>
>I checked the yield vs. Q2 in each combination of Pe><0, Pz>=<0 and
>Pzz><0. all look normal on the same scale.
>
>Chi
>
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