[Frost] Phase Offsets

[Stuart Fegan]

Just a few more thoughts about yesterday's discussion of phase offsets, 
and a slide summarising what I think I know about angular distributions 
and observable extraction;

http://nuclear.gla.ac.uk/~stuartf/thesis/updates/observable_angles.pdf

I'm not sure what, if any, other observables will contribute to a phase 
offset in G.  All measurements are integrated over Proton (from Hyperon 
decay) polar angle, so I've always assumed any/all recoil phase shifts 
in the Kaon distributions were integrated out.  This may not be the case 
(especially after what has been seen in g8b on the non-exclusive KLambda 
topology), but to make things more complicated, other target observables 
may also be contributing, which would not be present on the unpolarised 
g8b target.

So in conclusion, diamond offset is but one of many constraints which 
should be considered in an observable extraction from asymmetries, and 
for G on FROST, probably the beam asymmetry too.  I'll keep at it when 
time allows.

Cheers,
Stuart

-- 
Dr Stuart Fegan
Honourary Research Associate
Nuclear Physics Group
University of Glasgow
School of Physics and Astronomy
Kelvin Building
University of Glasgow
Glasgow, G12 8QQ
Scotland, UK

E-mail: s.fegan.glasgow at gmail.com