[G8b_run] Polarization modification

[Eugene Pasyuk]

For those on site I booked F224-225 for tomorrow at noon.

-Eugene

On 1/31/12 10:54 , Ken Livingston wrote:
> Hi All,
> Let's have a g8 call tomorrow, wesdnesday,  to discuss this, and where
> to go next with analysis notes etc.
>
> The usual time - 12.00 Jlab time.
>
> Eugene can you initiate that please.
>
> Please add anything you need to the wiki page for the meeting:
> https://clasweb.jlab.org/rungroups/g8/wiki/index.php/Feb_01,_2012
>
>
> https://clasweb.jlab.org/rungroups/g8/wiki/index.php/Instructions_for_off-site_participants
>
>
> Regards,
> Ken
>
>
>
> On 01/27/2012 10:21 PM, Michael Dugger wrote:
>> Volker,
>>
>> Yes.
>>
>> Using your criteria, I think that 4% would be a good estimate for the
>> systematic uncertainty associated with the consistency of the
>> polarization.
>>
>> Take care,
>> Michael
>>
>> On Fri, 27 Jan 2012, Volker Crede wrote:
>>
>>> Dear Michael,
>>>
>>> Thanks for the update. I have already implemented your new numbers and submitted a few jobs on our cluster.
>>>
>>> Neglecting the 2.1 GeV dataset and comparing the numbers in your table (Slide 3), would you agree that the data can still be made self-consistent to within 4%? This is the largest number I see in your table (for the 1.7 (auto) - 1.9 overlap region, PARA). My feeling is that your new results are even somewhat better than the previous ones. Can we conclude that 4% is a good estimate for the systematic error associated with the degree of polarization provided that:
>>>
>>> 1) The latest polarization tables have been used.
>>>
>>> 2) The polarization corrections (based on the overlap studies) have been applied.
>>>
>>> 3) The event-based energy cut has been applied:  event edge - 200 MeV<   E(gamma)<   event edge.
>>>
>>> Best wishes and thanks again
>>>
>>>        Volker
>>>
>>> PS: I am sending this from my gmail account, so it may not go to the g8b run group. FSU has a huge email problem at the moment and JLab regularly rejects emails from @fsu.edu.
>>>
>>>
>>> On Jan 27, 2012, at 2:24 PM, Michael Dugger wrote:
>>>
>>>> Hi,
>>>>
>>>> I have made some slight changes to the polarization modification. Volker
>>>> and Ken helped me determine that there was an inconsistency in how I was
>>>> determining which polarization look-up table to use for each event. The
>>>> inconsistency led to the coherent edge being wrong by up to 4 MeV (~ half
>>>> an eCounter).
>>>>
>>>> The results are very similar to what I had shown previously. A pdf showing
>>>> a comparison of the new results to the old ones can be found at
>>>> http://www.jlab.org/Hall-B/secure/g8b/ASU/polCorrectionV3.pdf
>>>> where the new results are in blue.
>>>>
>>>> Note: There is one difference in results worth mentioning. I no longer see
>>>> the need to remove eCounters>   299 (within the overlap region) for the 1.9
>>>> GeV data set :)
>>>>
>>>> To implement the new modification, one only needs to replace the ldPar
>>>> values with the those given at the bottom of this email (also listed on
>>>> the pdf).
>>>>
>>>> I apologize for any inconvenience this may cause.
>>>>
>>>> Sincerely,
>>>> Michael
>>>>
>>>> New ldPar values:
>>>>
>>>> 1.3 manual
>>>> ldPar(1) = 1.007560
>>>> ldPar(2) =-0.5872520E-02
>>>> ldPar(4) = 1.012520
>>>> ldPar(5) =-0.6416970E-02
>>>>
>>>> 1.5 manual
>>>> ldPar(1) = 1.012790
>>>> ldPar(2) =-0.4507690E-02
>>>> ldPar(4) = 1.002800
>>>> ldPar(5) =-0.1880110E-02
>>>>
>>>> 1.7 manual
>>>> ldPar(1) = 0.9893110
>>>> ldPar(2) =-0.1880110E-02
>>>> ldPar(4) = 0.9893210
>>>> ldPar(5) =-0.2127790E-02
>>>>
>>>> 1.7 auto
>>>> ldPar(1) = 0.9962880
>>>> ldPar(2) =-0.1159220E-02
>>>> ldPar(4) = 1.030480
>>>> ldPar(5) =-0.1110110E-01
>>>>
>>>> 1.9 auto
>>>> ldPar(1) = 1.012930
>>>> ldPar(2) =-0.2772200E-02
>>>> ldPar(4) = 0.9998200
>>>> ldPar(5) =-0.1616160E-02
>>>>
>>>> 2.1 manual
>>>> ldPar(1) = 0.9968230
>>>> ldPar(2) =-0.2214870E-01
>>>> ldPar(4) = 1.007930
>>>> ldPar(5) =-0.7647950E-02
>>>>
>>>>
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>>>>
>>>
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