[Tpe] TPE and VCS

[Larry Weinstein]

Dear Folks,

Moskov Amarian and I just compared the TPE and Hermes DVCS luminosity.  
Relative to Hermes, we have 10^-8 beam current and 10^9 target 
thickness.  Our beam energies are lower (and nonmonochromatic) and our 
acceptance has a larger forward-angle hole.  However, it is quite 
possible that there is some useful data.  We will need to detect all 
three final state particles, e'p and gamma.

Perhaps someone can extract a useful beam charge asymmetry measurement 
from our data.

Fortunately, we do not need to worry about this now, since we 
automatically take this data with our trigger and keep it with our data 
skimming.  But if anyone (especially not already in the TPE group) is 
interested in this data ...


-- 
				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