[d2n-analysis-talk] Hall A Collaboration Talk [Final Version] **Due 12/15/11**

[Matthew R. Posik]

On Wed, Dec 14, 2011 at 2:06 PM, ZEIN-EDDINE MEZIANI <meziani at temple.edu>wrote:

> Slide 9: Live time is underscored I presume it should be L_T, it looks
> like _LT
>
> Slide 14: Do you know whether the statistics of the experiment reaches the
> proposal goal.
> I know Matt and you did the exercise of of roughly checking that it is
> true. It would be good to check it again and perhaps mention what it is in
> comparison to the proposal.
>

A while back, Dave and I did a check on the total statistics that we
collected. To estimate this, we took one run and applied our good electron
cuts at the time, for different momentum bins, and counted the events that
survived the electron cuts which we will call Ne. We then formed a ratio of
good events that we said were electrons to total events that were recorded
for that run, we will call the total events recorded for that run Nraw.
We  then computed the total recorded events for all of our production runs,
we will call the sum of events over all production runs Nt. Next we
multiplied the ratio of good electrons/total events for the one run
mentioned above and the total events over all runs. So the total statistics
for a particular momentum bin was defined as:

 (Ne/Nraw)*Nt

However, this is not really correct. During our 5.89GeV running, our T2
trigger was changed quite a bit. By changing the T2 trigger we will be
changing the ratio of good electron to recorded events for that particular
run (Ne/Nraw) depending on the trigger setting and this will affect our
estimate.


> The absolute systematic errors of course will depend on the size of the
> asymmetry but perhaps we can start to look at the dominant contributions.
>
>  I believe our current systematic error on the target polarization is the
more dominate one at 4.9%. This should be reduced once the water
calibration is taken into account.

> Zein-Eddine


-Matt

>
>
> On Wed, Dec 14, 2011 at 1:35 PM, David Flay <flay at jlab.org> wrote:
>
>> Hi all,
>>
>> I plan on submitting my talk (version 6) tomorrow morning and make sure it
>> looks OK on the projector.  Please let me know if there are any last
>> comments by tonight so that I can make the necessary changes.  The talk is
>> here:
>>
>> https://hallaweb.jlab.org/wiki/images/8/85/D2n_12_2011_v6.pdf
>>
>> 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://quarks.temple.edu
>> -------------------------------------------------
>>
>> _______________________________________________
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>>
>
>
>
> --
> Z.-E. Meziani
> Department of Physics
> Temple University
> 1900 N. 13th St.
> Philadelphia, PA 19122-6082
> 215-204-5971
>
>
> _______________________________________________
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> https://mailman.jlab.org/mailman/listinfo/d2n-analysis-talk
>
>


-- 
Matthew Posik
Email: posik at temple.edu
Temple University Physics Dept.
Office: BA-319
Office #:  215-204-1331
WebSites:
Temple:
http://quarks.temple.edu/
d2n:
http://hallaweb.jlab.org/experiment/E06-014/
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