What is the correct way to determine the linearity??

Producing some more plots with weighted and unweighted single pions - i.e. linearity plotted again eta - I finally realized, why Sven's linearity plots look so much different than mine: while he is comparing the weighted energy to the TRUE beam energy, I am comparing it to the true energy deposited in the calorimeter, i.e. Calibration Hits (just as Elin did, because this probably made more sense for the test beam stetup). However, the outcome is pronouncedly different - and I do wonder, why there linearity is better when comparing to the TRUE beam energy (even though we are actually deriving the weights for the calib hits). Also, even though, we actually do want do get back the beam energy, I do wonder: How? We are not at any stage refering to it - even for the weights making, we are only using the Calib hits - that are actually over compensated... Need to think about that - and would like to know, which of the two I should compare to in future...

fig. 1 Comparison to True Calib Hit energy

fig. 2 Comparison to True Beam energy (generated energy of the single pion)

-- KristinLohwasser - 28 Aug 2007