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Dear Folks,<br>
<br>
I just thought I'd point out a key paragraph in the PAC34 report:<br>
<br>
A flagship of the JLab program has been the measurement of fundamental
properties of the nucleon, such <br>
as electromagnetic formfactors. These have been measured with two
different techniques: Rosenbluth <br>
separation and polarization transfer. These have led to different
results. It is believed that a significant <br>
contribution to this difference comes from two photon exchange
corrections that affect the Rosenbluth <br>
method most. A key experiment “At Risk” is E07-005, which explores
these multi-photon exchange <br>
contributions. It is likely that the possibly competing Olympus
experiment using the BLAST detector <br>
proposed for DORIS at DESY will not run, and so the PAC would be <b>dismayed</b>
if this important check <br>
was not completed in a timely fashion. <br>
(emphasis added, LW)<br>
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Sincerely,
Larry
-----------------------------------------------------------
Lawrence Weinstein
University Professor
Physics Department
Old Dominion University
Norfolk, VA 23529
757 683 5803
757 683 5809 (fax)
<a href="mailto:weinstein@odu.edu">weinstein@odu.edu</a>
<a href="http://www.physics.odu.edu/~weinstei">http://www.physics.odu.edu/~weinstei</a>
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