[Tpe] TPE and PAC

[Larry Weinstein]

Dear Folks,

I just thought I'd point out a key paragraph in the PAC34 report:

A flagship of the JLab program has been the measurement of fundamental 
properties of the nucleon, such
as electromagnetic formfactors. These have been measured with two 
different techniques: Rosenbluth
separation and polarization transfer.  These have led to different 
results. It is believed that a significant
contribution to this difference comes from two photon exchange 
corrections that affect the Rosenbluth
method most. A key experiment "At Risk" is E07-005, which explores these 
multi-photon exchange
contributions. It is likely that the possibly competing Olympus 
experiment using the BLAST detector
proposed for DORIS at DESY will not run, and so the PAC would be 
*dismayed* if this important check
was not completed in a timely fashion. 
(emphasis added, LW)

-- 
				Sincerely,
				Larry 

-----------------------------------------------------------
Lawrence Weinstein
University Professor 
Physics Department
Old Dominion University
Norfolk, VA 23529
757 683 5803
757 683 5809 (fax)
weinstein at odu.edu
http://www.physics.odu.edu/~weinstei

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