[Halla_pi0] pi0 meeting 1:30 PM

[richard lindgren]

Hello,

After we hung up we talked more about VCS and BH. Both mechanisms are contributing.
In VCS the photon comes from the proton and BH it is radiated by the electron.

1) BH
Bertozzi and every other electron scattering enthusiast always claimed you can calculate the radiation effects and subtract them out. 
So what's the problem. Is it because we detect the proton as well?

2)VCS
There must be measurements in similar kinematics from JLab or Mainz that we can use to subtract VCS contributions after folding in our horrible resolution.

3) Tails from  delta contributions  are added in the DMT and MAID models since those models are determined by fitting the data.
What about ChPT when you are several MeV above threshold. Does anything in ChPT such as the low energy constants mock  it up?

4) We also should looking at some new theories  and not just ChPT

5)When all is said and done, I think Khem will show some the data in 2 MeV bins. That will average out effects due to our poor resolution. You can already see that near threshold when you add the 1 MeV bins together. At higher W above 10 MeV you don't need 1 MeV bins anyway.

6) Doug do you remember that we took some data with a collimator to block the windows. It might be useful to look at that data 
near threshold depending on what we see when Khem analyzes the window data.

7) I gave Khem's name to Patricia to give the E04007 status talk at the Hall A meeting.  He has go to learn to do this after all - he has to give a talk for his  PhD Thesis

Richard



Dr. Richard A Lindgren
Research Professor of Physics 
Department of Physics
University of Virginia
382 McCormick Rd
Charlottesville, VA 22904
ral5q at virginia.edu







On May 14, 2012, at 12:24 PM, richard lindgren wrote:

> Greetings,
> We will meet Monday  at 1:30 PM for the pi0 data analysis meeting. 
> At UVa we will meet in Room 120 as before and in Doug's office for those of you at JLab.
> Cole send Doug your phone number of where you will be.
> Richard
> 
> 
> 
> 
> 
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