BigBite Resolution
This week I was working on the BigBite resolution. I was trying to determine how the
resolution of each variable changes with the particle momentum. In my analysis I
considered 2GeV and 1GeV data. I also tried to use 3GeV data, but we do not have
enough 12C and 1H data, to produce presentable results. For the determination
of the TgY resolution I considered 12C data, while for the TgTh and TgPh I
considered hydrogen elastic data.
From the results below you can see, that for all three variables resolution increases
with increasing momentum. This I what I was expecting, since the same behaviour (but
with much better resolution was observed in NIKHEF). However, in the case of TgY
you can see, that resolution worsens at high momenta. Simon and I believe, that this is caused
by my matrix. When doing calibration, I did not have much high momentum data to properly
calibrate my matrix to. Therefore optics is not working well in that region. What
do you think?
TgY Results:
I made my TgY resolution analysis first for the central foil of the optics-target. Later
Simon suggested to do the analysis also for the 2nd and 6th foil. For all the foil 1GeV and
2GeV data were analyzed.
1.) 
TgTh Results:
2.) 
TgPh Results:
3.) 
Problem:
I still have some problems with the correct estimation of the errors for the shown data points.
Data points that do not lie on the "main trend line" were determined from data with very low statistics,
but according to ROOT still have very small errors. For these points I believe that their error-bars
should be larger so that they would get consistent with the rest of the points.
Last modified on 02/23/11
