[Clas_hadron] Abstract for contributed QNP 2012 talk (April, 2012)

[Michael Dugger]

Phil,

You say "the statistical errors are greater than those from the 
systematic uncertainties", but what are your systematics for the 2.1 GeV 
set, and how do you estimate them? You have not told anyone in the g8b 
group how you came up with polarization systematics.

I'll tell you what I see from studies of pion photoproduction: 17% 
systematics in the polarization for the 2.1 GeV set. Volker Crede, using 
the 2 pion channel, also sees that the 2.1 GeV set looks problematic, with 
systematics at least as large as I see.

It is nice that you have made it through analysis review, but making it 
through review does not mean that your estimates of the systematics are 
correct.

Take care,
Michael

On Sat, 7 Jan 2012, Philip L. Cole wrote:

> Barry,
>
> Thanks for your comments.  The bottom line is that our statistics are such
> that the statistical errors are greater than those from the systematic
> uncertainties.  We extracted 8200 phis over these two energy settings, and
> when binned in cos_theta, there are just not that many phis per bin.
> Please see
> <http://wwwold.jlab.org/Hall-B/general/thesis/salamanca_thesis.pdf>.  The
> thesis served as the CLAS analysis note.  And the analysis was approved in
> this past November.  The issue of systematics and jitter of the coherent
> edge is addressed in 5.5 Summary of SDMEs on p. 87.  Also, please look at
> Fig. 6.2 on page 92 to see the quality of the fits to the data (with
> statistical errors).
>
> Regards,
> Phil
>
>> Phil, Mike Dugger has reminded me that it's actually the 2.1 edge setting
>> that is really bad, not the 1.9 GeV edge setting. The others have more
>> reasonable systematic problems (that is, no where near as severe as the
>> 2.1 GeV data set) But all edges required systematic corrections.
>>
>> ---BGR
>>
>> Professor  Barry G. Ritchie
>> Department of Physics
>> Arizona State University
>> Tempe, AZ  85287-1504
>>
>> Telephone: (480) 965-4707
>> Fax: (480) 965-7954
>>
>> -----Original Message-----
>> From: clas_hadron-bounces at jlab.org [mailto:clas_hadron-bounces at jlab.org]
>> On Behalf Of Barry Ritchie
>> Sent: Friday, January 06, 2012 9:56 PM
>> To: cole at physics.isu.edu; burkert
>> Cc: clas_hadron at jlab.org
>> Subject: Re: [Clas_hadron] Abstract for contributed QNP 2012 talk (April,
>> 2012)
>>
>> Phil, out of curiosity, does the (perhaps substantial) uncertainty in the
>> photon beam linear polarization have any significant effect on the SDME
>> results you intend to present (particularly considering the really big
>> problems with the 1.9 GeV coherent edge)? Or are you using the systematic
>> corrections for the polarization as suggested by Volker and Mike to get
>> your results?
>>
>> ---BGR
>>
>> Professor  Barry G. Ritchie
>> Department of Physics
>> Arizona State University
>> Tempe, AZ  85287-1504
>>
>> Telephone: (480) 965-4707
>> Fax: (480) 965-7954
>>
>> -----Original Message-----
>> From: clas_hadron-bounces at jlab.org [mailto:clas_hadron-bounces at jlab.org]
>> On Behalf Of Philip L. Cole
>> Sent: Friday, January 06, 2012 9:31 PM
>> To: burkert
>> Cc: clas_hadron at jlab.org
>> Subject: Re: [Clas_hadron] Abstract for contributed QNP 2012 talk (April,
>> 2012)
>>
>> Colleagues,
>>
>> Please find attached the improved version of the abstract for the QNP 2012
>> contributed talk.
>>
>> Phil
>>
>>> Hi Phil,
>>>
>>> you need some introduction as to what the measurement was supposed to
>>> accomplish.
>>> Also, you should state that the experiment was done with the CLAS
>>> detector and carried
>>> out by the CLAS collaboration.
>>>
>>> Cheers,
>>> Volker
>>>
>>>    On 1/6/12 4:15 PM, Philip L. Cole wrote:
>>>> Colleagues,
>>>>
>>>> Please find attached my proposed abstract to be presented as a
>>>> contributed
>>>> talk at the QNP 2012 conference, which will convene April 16-20, 2012.
>>>>
>>>> Regards,
>>>> Phil
>>>>
>>>>
>>>>
>>>> This body part will be downloaded on demand.
>>>
>>> _______________________________________________
>>> Clas_hadron mailing list
>>> Clas_hadron at jlab.org
>>> https://mailman.jlab.org/mailman/listinfo/clas_hadron
>>
>>
>> --
>>    Philip L. Cole
>>    Associate Professor
>>    Idaho State University
>>    Department of Physics
>>    Pocatello, Idaho 83209
>>    (208) 282-5799  office
>>             -4649  fax
>>     cole at athena.physics.isu.edu
>>     http://www.physics.isu.edu/staff/cole.html
>>
>>
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>
>
> --
>   Philip L. Cole
>   Associate Professor
>   Idaho State University
>   Department of Physics
>   Pocatello, Idaho 83209
>   (208) 282-5799  office
>            -4649  fax
>    cole at athena.physics.isu.edu
>    http://www.physics.isu.edu/staff/cole.html
>
>
>
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