[G12] Beam correction

[Michael C. Kunkel]

Greetings G12'rs


I have done a crude correction to the 2 runs I showed today (56515 & 
57130). Keep in mind that these runs are 10 MeV different in the 
mm/spectrum.

I have applied a beam correction as follows.

Pb = 4-vector of beam
Pt = 4-vector of target
Ppip = 4-vector of pi+
Ppim = 4 vector of pi-
X = scale factor
mp = proton mass

(XPb + Pt - (Ppip+Ppim))^2 = mp^2

Solving for X with the data and looking at the distribution I came up 
with a factor of *1.00509* for the run 56515 and *1.0* for run 57130, 
under exclusive cuts for the missing proton.

I then applied this correction of *1.00509 *to run 56515 and 
recalculated the mm/spectrum.

Attached is a plot of the corrected and uncorrected.

I believe this might be a suitable correction to explore.

BR
MK


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