[PRad] Fwd: we talked

[Haiyan Gao]

Dear PRad colleagues:

I am sending you a report from John Ralston and his student related to 
the proton charge radius puzzle.

I also like to report that our PRad result generated great interest in 
the community at the hadron meeting that I reported as well as Weizhi's 
APS talk. The questions I received following my talks:

1. how much better will PRad do re reducing our uncertainties? This is 
something I hope we can discuss and address in our DRad proposal. The 
question was asked by Jen-Chieh Peng

2. Tony Thomas asked a question about fitting concerning the Q^2 range 
used for the fit, which we addressed in Xuefei's paper

I think these are the two important questions I remembered. Thanks,

Best, Haiyan




-------- Forwarded Message --------
Subject: 	we talked
Date: 	Wed, 17 Apr 2019 11:42:07 -0500
From: 	John Ralston <ralston at ku.edu>
To: 	H. Gao <gao at tunl.duke.edu>
CC: 	John Craig Martens <j671m042 at ku.edu>



Hello Haiyan

it was good to see you at GHP.

When we talked, I mentioned that
the history of decisions of CODATA have excluded data, leading to a wrong
perception that the muonic lamb shift
data was "inconsistent". The paper attached (invited book chapter) shows 
there is no proton
size problem... especially with the value
reported by PRAD. The fundamental constants
are all coupled and cannot be determined by
piecemeal fits. The proton size and Rydberg in electronic hydrogen 
spectra are exceedingly correlated, contradicting
claims that either would be highly determined, or over-determined.

Our first accomplishment is that r_p =0.84+small is perfectly consistent 
with world data. Our second
accomplishment makes it possible for anyone
to find the fundamental constants with their
own assumptions. Just type numbers into a website ...which is almost
ready for you or your students to play with!

all the best

JP

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