[PRad] Comparision Plots

[Douglas Higinbotham]

And here is the ComparisionLinearMore.pdf plot.

From: Douglas Higinbotham <doug at jlab.org>
Date: Saturday, December 28, 2019 at 12:14 PM
To: "prad at jlab.org" <prad at jlab.org>
Cc: Jay Benesch <benesch at jlab.org>
Subject: Comparison Plots


In trying to understand Fig. 1 of https://arxiv.org/abs/1912.01735, I plotted the PRad final normalized results from https://wiki.jlab.org/pcrewiki/index.php/PRad_Results  along with the model of Alarcon and Weiss https://doi.org/10.1103/PhysRevC.99.044303 for a radius of 0.84 and 0.88fm.  (i.e. no free parameters, no re-normalization, no non-sense).

I also added the result of Mainz’s spline fit from https://doi.org/10.1103/PhysRevC.99.044303.

As far as I can tell, Marko fixed the radius and the value of the first derivative of his fit function and then did a regression.   This seems like a lot of extra work (and several extra parameters) as Alarcon and Weiss provide a full functional form which is a function of a single variable, the charge radius.  In any case, the final results are nearly the same (shown in ComparisionLinear.pdf and ComparisionLog.pdf).

One can again see that PRad’s GE results are systematically higher than the Mainz results (represented by the spline) though in agreement with the conventional nuclear physics model with the CODATA-2018 radius.   Interestingly the Mainz results seem to run parallel to the conventional model out to larger Q2 (shown in the ComparisionLinearMore.pdf).

Sincerely,
Douglas



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