[Halld-npp] Minutes posted and the Overleaf document has been updated

[Mark Ito]

Updated PDF:

https://userweb.jlab.org/~marki/share/Pi0Polarizability_2020-06-15.pdf

Remember the up-to-the-minute version is at

   https://www.overleaf.com/project/5d5d22c3f2f2fe72b728c4e6

Also remember that you can download the current PDF from the Overleaf site.

On 6/12/20 8:59 PM, Mark Ito wrote:
>
> Folks,
>
> I did a capture into GitHub of the document on Overleaf just now. For 
> convenience, I created a PDF of this version which you can find at
>
> https://userweb.jlab.org/~marki/share/Pi0Polarizability_2020-06-12.pdf
>
>   -- Mark
>
> On 6/12/20 5:08 PM, Elton Smith wrote:
>> Dear collaborators,
>>
>> I have posted some minutes of today's meeting on the wiki at 
>> https://halldweb.jlab.org/wiki/index.php/Pi0_Polarizability_Meeting_Jun_12,_2020#Minutes.
>>
>> I have also updated the draft on Overleaf with the latest changes. 
>> Please provide feedback as soon as possible so that we can post an 
>> update for the collaboration early next week.
>>
>> Note: I updated the summary plot (Fig. 29 of the proposal). We state 
>> that the (statistical) uncertainties are obtained directly from the 
>> fit (Fig. 21). It turns out the AmpTools fits provide very reasonable 
>> errors near threshold where the statistics are large, but give very 
>> small uncertainties at high mass. If we use the fitted statistical 
>> uncertainties directly, I get the attached plot. One can see that at 
>> large masses, the uncertainty converges to the 5% systematic 
>> uncertainty. There are only 10-20 Primakoff-pi0pi0 events in this 
>> mass region. This is very likely an underestimate of the true 
>> statistical uncertainly. [Note that this is a well-known fact of the 
>> output of the Amplitude fit.] Therefore, I have produced a hybrid 
>> plot, where I use fitted errors where the statistics is large and the 
>> "naive" statistical uncertainty if the fitted uncertainty is very 
>> small. The plot that is included into the document uses the latter 
>> strategy. We can talk about this next week.
>>
>> Cheers, Elton.
>>
>>
>> _______________________________________________
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