Chi,
use runs starting with 8479. This is when we think the to problem was
fixed. Also, use runs upto 8598.
Cheers, Vitaliy
Chi Zhang wrote:
>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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