[Frost] Comparison for CH2 target

[Michael Dugger]

Hi,

I have a plot of the CMU and ASU tagger corrections for CH2:

First set of 2.478 data->
http://www.jlab.org/~dugger/g9/g9a/tmp/taggerComp_CH2NoCsubtractLo.gif

Second set of 2.478 data->
http://www.jlab.org/~dugger/g9/g9a/tmp/taggerComp_CH2NoCsubtractHi.gif

All of 2.478 data->
http://www.jlab.org/~dugger/g9/g9a/tmp/taggerComp_CH2NoCsubtract.gif

* The blue points are the ASU tagger corrections
* The black line is the CMU tagger corrections

NOTE: Results shown are for CH2 target. The corrections have no Carbon 
subtraction.

The agreement for CH2 is not as good as for the Butanol target. We will 
have to see the results after Carbon subtraction to be sure. I'll also 
have check to see how the different corrections affect the pi0 mass.

Overall, it looks like the tagger correction is negative for the Butanol 
and positive for the Carbon! (I see this even when I do a Carbon 
subtraction.)

The bad news is, of course, that we have no reason for there to be a 
target dependence in the tagger correction :(

I don't know how an incorrect eloss could influence the tagger correction. 
The eloss package just modifies the absolute value of momentum and if the 
CLAS angles are correct, then the tagger correction should be independent 
of the momentum correction.

This situation is very odd.

-Michael