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corrected topological cross sections



Dear Friends

During yesterday's calorimeter meeting Richard pointed out that
Table 1 in my note had an error since the sum of topological cross
sections from the quoted bubble chamber data did not add up to
124 ub.  He was certainly correct - problem was a copy/paste from
the wrong table in an earlier note.  The corrected Table 1 is attached.
Thanks to Richard for pointing this out.

Since yesterday I also looked at mass distributions for the
gam p --> pi+ pi- 4 gam p reaction.  The ratio of pi0 to eta
(in the 4 gam component) is about 10:1 and the pi+pi-pi0
spectrum shows etas and omegas.  There is no structure in
the 4gamma effective mass nor in the pipi4gamma mass.

I will look at other multi-photon states and finalize my document
as a GlueX-doc- in the next day or two.

Cheers
Alex
-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Alex R. Dzierba
Chancellor's Professor of Physics (Emeritus)
Department of Physics / Indiana U / Bloomington IN 47405 / 812-855-9421
JLab Visiting Fellow
Jefferson Lab / 12000 Jefferson Ave / Newport News, VA 23606 / 757-269-7577
Home Phone: 812-825-4063  Cell:  812-327-1881  Fax: 866-541-1263
http://dustbunny.physics.indiana.edu/~dzierba/
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Table_1.jpg