[Frost] Incident photon corrections

[Sungkyun Park]

Hi, Michael.

After today meeting, I checked FSU Energy Correction again to solve the doubtful point in CH2 target.
I found some wrong part in my equation. As this wrong part, the points went up after 0.7 of the incident electron energy in CH2 target. I will remake the same plots after fixing during the weekend.

I had the updated momentum correction to improve the mean and sigma together.
I will make pull distributions and pi0 masses for each target AFTER FSU-EC, ELoss, and MomC.
I will also check the vertex position when I make them :)

Sung
Florida State University



----- Original Message -----
From: Michael Dugger <dugger at jlab.org>
Date: Friday, September 24, 2010 2:28 pm
Subject: [Frost] Incident photon corrections
To: frost at jlab.org

> 
> Hi,
> 
> I apologize for missing the meeting this week. I messed up the 
> time, I 
> got it in my head that the meeting started at 8:30 Arizona time.
> 
> I looked at the presentation by Sung. It looks like CMU and FSU are 
> in 
> good agreement for the CH2 target for photons with energies up to 
> 0.8 of 
> the incident electron energy :)
> 
> The scale on the plots is too large, this makes it hard to check 
> the 
> comparison. With that said, it looks to me like FSU is getting an 
> energy 
> correction for the Butanol target that is close to what they get 
> for the 
> CH2 target. This is VERY important. We can not have a z-vertex 
> dependence 
> in the incident photon energy.
> 
> My current hope is that FSU Butanol results are right, and that 
> CMU, and 
> ASU Butanol results are wrong. As a check, it would be good to see 
> pull 
> distributions and pi0 masses for each target (after energy and 
> momentum 
> corrections are applied). For the pi0 mass, it may be important to 
> restrict events to have proton phase-space where the vertex looks 
> reasonable.
> 
> If the FSU results have a good pi0 mass (from the reaction gamma p -
> > p 
> pi0), and the pulls look good, we may be close to having the energy 
> and 
> momentum corrections :)
> 
> Take care,
> Michael
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