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<p>Dear PRad colleagues:</p>
<p>I am sending you a report from John Ralston and his student
related to the proton charge radius puzzle.</p>
<p>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:</p>
<p>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</p>
<p>2. Tony Thomas asked a question about fitting concerning the Q^2
range used for the fit, which we addressed in Xuefei's paper</p>
<p>I think these are the two important questions I remembered.
Thanks,</p>
<p>Best, Haiyan<br>
</p>
<p><br>
</p>
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<th valign="BASELINE" nowrap="nowrap" align="RIGHT">Subject:
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<td>we talked</td>
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<th valign="BASELINE" nowrap="nowrap" align="RIGHT">Date: </th>
<td>Wed, 17 Apr 2019 11:42:07 -0500</td>
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<th valign="BASELINE" nowrap="nowrap" align="RIGHT">From: </th>
<td>John Ralston <a class="moz-txt-link-rfc2396E" href="mailto:ralston@ku.edu"><ralston@ku.edu></a></td>
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<th valign="BASELINE" nowrap="nowrap" align="RIGHT">To: </th>
<td>H. Gao <a class="moz-txt-link-rfc2396E" href="mailto:gao@tunl.duke.edu"><gao@tunl.duke.edu></a></td>
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<th valign="BASELINE" nowrap="nowrap" align="RIGHT">CC: </th>
<td>John Craig Martens <a class="moz-txt-link-rfc2396E" href="mailto:j671m042@ku.edu"><j671m042@ku.edu></a></td>
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<br>
<br>
Hello Haiyan<br>
<br>
it was good to see you at GHP.<br>
<br>
When we talked, I mentioned that<br>
the history of decisions of CODATA have excluded data, leading to
a wrong<br>
perception that the muonic lamb shift<br>
data was "inconsistent". The paper attached (invited book chapter)
shows there is no proton<br>
size problem... especially with the value<br>
reported by PRAD. The fundamental constants<br>
are all coupled and cannot be determined by<br>
piecemeal fits. The proton size and Rydberg in electronic hydrogen
spectra are exceedingly correlated, contradicting<br>
claims that either would be highly determined, or over-determined.<br>
<br>
Our first accomplishment is that r_p =0.84+small is perfectly
consistent with world data. Our second<br>
accomplishment makes it possible for anyone<br>
to find the fundamental constants with their<br>
own assumptions. Just type numbers into a website ...which is
almost<br>
ready for you or your students to play with!<br>
<br>
all the best<br>
<br>
JP <br>
<br>
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