Alexander Gramolin gramolin at jlab.org
Tue Feb 4 11:02:26 EST 2014

---------- Forwarded message ----------
From: Lorelei Chopard <lorelei at jlab.org>
Date: 4 February 2014 10:36
Subject: [Cuga] WORKSHOP ON THE PROTON RADIUS PUZZLE- A message from Carl
To: cuga at jlab.org


Hosted by:  MITP  (Mainz Institute for Theoretical Physics, Johannes
Gutenburg-University, Mainz, Germany)

DATES:  June 2–6, 2014

VENUE:  Waldthausen Castle, suburban Mainz

-->  Experimenters as well as theorists are welcome.

The size of the proton is one of the most fundamental observables in hadron
physics. It is measured through an electromagnetic
  form factor. The latter is directly related to the distribution of charge
and magnetization of the baryon and through provides the basis
of nearly all studies of the hadron structure. In very recent years, a very
precise knowledge of nucleon form factors has become more
and more important as input for precision experiments in several fields of
physics. The recent PSI measurement of the proton charge
radius from the Lamb shift in muonic hydrogen has given a value that is 5
standard deviations lower than the values obtained from
energy level shifts in electronic hydrogen and from electron-proton
scattering experiments. These puzzling findings that the proton
  radius appears to be different when measured with muons vs. electrons,
motivates this workshop dedicated to this topic, bringing
  together atomic, nuclear, and beyond standard model physicists. It
remains unknown if the solution lies in subtle experimental effects,
unexpected behavior of QCD, new physics beyond the standard model, or
something not yet discussed.

General information is at http://www.mitp.uni-mainz.de/155_ENG_HTML.php

More specific information and application/registration is at

For further information, feel free to contact any one of the organizers,

Carl Carlson College of William and Mary, carlson at physics.wm.edu  ;
Richard Hill, Univ. of Chicago, richardhill at uchicago.edu  ;
Savely Karshenboim MPI for Quantum Optics Munich and Pulkovo Observatory
St. Petersburg, savely.karshenboim at mpq.mpg.de  ;
Marc Vanderhaeghen JGU Mainz, marcvdh at kph.uni-mainz.de
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