[Frost] Meeting follow up

[Michael Dugger]

Hi,

I have put some example code on the phase space dependent scale factors at
http://clasweb.jlab.org/rungroups/g9/wiki/index.php/Mike%27s_analysis_page#Phase_space_scale_factors_.28version_1.29

I have the requested scale factor plots:

Reminder: The reaction is
gamma p -> p pi+ pi- Y,
where massY^2 < -0.1 GeV^2
and the scale factors are simply equal to the NumberOfEvents_from_Butanol 
divided by NumberOfEvents_from_Carbon


Proton TBTR scale factors:
http://www.jlab.org/~dugger/g9/g9a/tmp/sfSlices1.gif
http://www.jlab.org/~dugger/g9/g9a/tmp/sfSlices2.gif

where the y-axis is the value of the scale factor, the x-axis is theta lab 
angle, and the value of the fixed momentum is shown clearly on each panel.

For momentum above ~600 MeV/c the scale factors might be well represented 
with a zero-order polynomial. For momentum below ~550 MeV/c, there is a 
strong momentum and theta dependence.

Pi+ TBTR scale factors:
http://www.jlab.org/~dugger/g9/g9a/tmp/sfSlices1pip.gif
http://www.jlab.org/~dugger/g9/g9a/tmp/sfSlices2pip.gif

These look good. We can probably use the negative Mass^2 scale factors 
for the pi+ reaction :)

MVRT scale factors:
http://www.jlab.org/~dugger/g9/g9a/tmp/sfSlices1mvrt.gif
http://www.jlab.org/~dugger/g9/g9a/tmp/sfSlices2mvrt.gif

These look much better than the Proton TBTR scale factors, but not as good 
as I expected. There is still a strong momentum and theta dependence for 
momentum below ~500 MeV/c. This might be due to low angle and low momentum 
protons having difficulties "swimming" through the target.

Take care,
Michael