[PRad] Ashot, Re: Before and After PRAD Images (based on your slide 7 and PRAD simulations)

[gasparan at jlab.org]

  Thanks John and Douglas,

 For sure, this plot is nicely showing the strength of our experiment.
 But, before showing anything new in an International conference we
 have to be very careful to not over sale the experiment. The major
 meaning of this presentation is to demonstrate that we performed the
 experiment and we have a good data to start the physics.

 Let's keep discussions open for this and other particular plots then
 to decide to show them in any outside auditorium.

 Thank you both,
 Ashot


> I would argue that this specific comparison is dangerous to make. That
> extraction is based on the Mainz data, but it makes several
> approximations to isolate G_E.  I uses a high-Q^2 parametrization of
> Ge/Gm to correct for Gm at very low Q^2, and neglects the uncertainty
> with this correction.  It also neglects the normalization uncertainty
> and the correlated systematics (the 'slope' correction Mainz applies) on
> the data.
>
> Doug can correct me if I'm off on any of the details for this particular
> extraction, but I really don't think that the uncertainties shown on
> these points can be considered representative of the reliability of the
> points.
>
> -John
>
> On 7/28/2016 10:28 PM, gasparan at jlab.org wrote:
>>    Dear Douglas,
>>
>>    This is an interesting plot and very attractive, but at this stage
>>   we better to be very careful with any speculations of the PRad data
>>   before we discuss them in the collaboration and understand the
>> details.
>>
>>   Thank you, we will show it after discussions in the Collaboration.
>>
>>   Ashot
>>
>>
>>> Dear Ashot,
>>>
>>> For slide 7, I made you a before and after PRAD image based on a PRAD
>>> Monte Carlo
>>> simulation of expected results and the data you are showing on that
>>> slide.
>>>
>>> I can easily make any changes you like.
>>>
>>> Best Wishes,
>>> Douglas
>>>
>>>
>>> NOTE:  This expected PRad data was simulated using a 0.88 fm radius G_E
>>> function.
>>> It would be fun to repeat the simulation with one of the 0.84 fm G_E
>>> functions.
>>
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>
> --
> John Arrington
> Group Leader, Medium Energy Physics Group
> Physics Division, Argonne National Laboratory
> email: johna at anl.gov   office: (630)-252-3619
>
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