Hi, all
Unfortunately, from the ed events so far, I do not seem to see an increase
in rate AT ALL. rather, I have
deuteron in left 2633 in right 3205 total charge 16267 C
rate: 0.36 events/C which is lower than even the march 40cm runs. missing
counts in electron right still persists.
I do hope someone could cross check the total charge I got. I used runs
betweem 8390 and 8578.
Chi
On Tue, 6 Jul 2004, Aaron Joseph Maschinot wrote:
>
> there is about 17kC of polarized deuterium data since last thursday (there
> is a little more such data, but root yells about the lrn files not being
> closed correctly).
>
> this data gives me a QE ep rate of 9.5 events/C. this is UP about 60%
> compared to the corresponding rate before the most-recent shutdown.
>
> take a look at the attached plots of the bema-vector asymmetry versus
> missing momentum and Q2, respectively. all show a massive increase
> in vector polarization:
>
>
> dilution | vec pol (assuming h = 0.64+-0.01)
> (left) (right) | (left) (right)
> ------------------------------------------------------------------
> vs p_m : 0.657 +- 0.026 0.576 +-0.020 | 1.027 +- 0.044 0.900 +- 0.034
> |
> vs Q2 : 0.688 +- 0.027 0.611 +-0.021 | 1.075 +- 0.045 0.955 +- 0.036
>
>
> ummm... yeah. maybe this is a little too good. isn't there a realistic
> maximum vector polarization (less than 100%) that one could hope to
> obtain???
>
> the plot versus missing momentum for polarization perpendicular to q
> (i.e. the left sector plot) looks especially good for two reasons.
>
> 1) the asymmetry's "frown" shape for p_m < 0.2GeV shows up very well in
> the data.
>
> 2) though still a little statistics limited, the asymmetry's rise to
> positive values for p_m > 0.3GeV is also very visible.
>
> i would once again remind everyone that much more empty target data is
> needed in order to nail down the background contribution at p_m > 0.3GeV.
>
> aaron
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