[Halld-physics] gamma,p -> eta,p cross section measrement

[Richard Jones]

Dear Colleagues,

I sent this message after the meeting this morning, but it has been sitting
in the queue waiting for approval since then -- I think the attachment was
too big. So here it is without the attached paper, sorry.

Hello,

Following up on the discussion from today's physics working group meeting,
the nearest measurement of the cross section for gamma,p -> p,etaprime that
I have in my collection is from the following paper.

Struczinksi et.al, Nucl.Phys. B108, p. 45-76. (see attached pdf, Table 8,
line is labeled by obsolete notation pX^0 -- this "X^0" is now called the
eta-prime, according to a more recent reference I found.)

The authors report a total cross section of 200nb +/- 100nb over the range
photon energy range 4-6GeV.  This error is mostly statistical, the
systematic error is a factor 3 smaller.

-Richard Jones
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