[b1_ana] Statistics using Positive Polarization Only

[Karl Slifer]

Hi all,

I believe this has been verified by Oscar, and Patricia is also working to
double check.  Assuming it is verified, this factor of 2 impacts the
decisions we made yesterday (namely to move some of the high-x time to the
low x points).  So I think we need to reevaluate.  I see a few options:

1) move some of the time back to x=0.45

2) reduce from 3 to 2 points.

3) Vary the x=0.45 point a bit to see if we can find another "sweet spot"
statistically that is not exactly the same as Hermes, but still close.

4) show this plot as an example of what we can achieve with modest
improvement in tensor polarization (Pzz=0.2), along with another plot that
shows the expectation for more optimistic improvement (Pzz = 0.5 or 0.3)

thoughts, other suggestions?

-Karl




On Thu, May 2, 2013 at 12:28 PM, Elena Long <ellie at jlab.org> wrote:

>  Good afternoon,
>
> I've re-run the statistics using the method we decided on yesterday. The
> results can be seen here:
> https://hallcweb.jlab.org/wiki/index.php/Elong-13-05-01-Azz-Method-2#Plots_with_using_Azz_Method_2_Calculations
>
> Please note that they have grown by a factor of two compared to the
> previous assumption, where we had both positive and negative polarization.
> The calculations for the new method are formalized in
> https://hallcweb.jlab.org/wiki/index.php/Elong-13-05-01-Azz-Method-2#Azz_Formalism_-_Method_2
>
> Oscar has been mentioning that the code was missing a sqrt(2), which was
> true. The other sqrt(2) on top of it comes from the assumption before
> equation 25, which brings the total uncertainty a factor of two larger than
> was projected with the old method.
>
> Take care,
> Ellie
>
> --
> Elena Long, Ph.D.
> Post Doctoral Research Associate
> University of New Hampshireelena.long at unh.eduellie@jlab.orghttp://nuclear.unh.edu/~elong(603) 862-1962
>
>
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