[Frost] Incident photon corrections

[Michael Dugger]

Sung,

When you make the pi0 mass and pull plots, it may be good to see the 
results for all E_gamma, E_gamma/E_e < 0.7, and for E_gamma/E_e > 0.7 
(Unless you run into problems with statistics).

Take care,
Michael

On Fri, 24 Sep 2010, Sungkyun Park wrote:

> 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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>>
>