[d2n-analysis-talk] A_1^n Statistical Error Technical Note (Update)

[David Flay]

On Fri, Sep 10, 2010 at 10:26 AM, David Flay <flay at jlab.org> wrote:

> Hi all,
>
> I have made corrections to the A_1^n statistical error technical note,
> adding superscripts to the quantities N_p, N_cut, and N_raw.
>
> I have also included the 4-pass error bars in the plot on the last page.
> I did <not> skew the positions of the 4-pass points on this plot, so what
> you see is what you get; therefore, the 4-pass points are in good
> agreement with what we see at 5-pass, for those overlapping data points.
> In one case (x ~ 0.633) the error bar is reduced by about a factor of 2
> (4% at 5-pass to ~1.8% at 4-pass).
>
> You can find the (main directory) updated note (v3) here:
>
> http://www.jlab.org/~flay/thesis/A1_error/<http://www.jlab.org/%7Eflay/thesis/A1_error/>
>
> I would still like to investigate the quantities R and D, as brought up by
> Greg in the meeting yesterday.
>
> Thanks,
>
> Dave
>
> P.S. -- Still looking for ways in ROOT to generate that error band at the
> bottom of a plot, so I can insert the E99-117 systematic errors on their 3
> data points...
>

Dr. Meziani suggested that I should make momentum bins for the 4-pass data
to sync up with those of the 5-pass data.  To this end, I've added momentum
bins of:

p = 0.90, 1.13, 1.20, 1.27, and 1.70

to the 4-pass data, and a momentum bin of p = 0.80 to the 5-pass data.  From
what I can tell, we did not take data on the LHRS for the above mentioned
momenta at 4-pass, likewise for p = 0.80 at 5-pass.  However, since A_1^n
isn't using the  LHRS, it won't affect this calculation.

Such changes have been reflected in a new note, labeled v4.

Thanks,

Dave


-- 
-----------------------------------------------------------
David Flay
Physics Department
Temple University
Philadelphia, PA 19122

office: Barton Hall, BA319
phone: (215) 204-1331

e-mail: flay at jlab.org
            flay at temple.edu

website: http://www.jlab.org/~flay <http://www.jlab.org/%7Eflay>
              http://quarks.temple.edu
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