Comparison of 2006 and 2009 Tower Gains, and Effect of MIP Cuts on 2009 Analysis

The table shows the different MIP cuts for the different data passes I've analyzed:

pass # minimum energy (times expected MIP energy) maximum energy (times expected MIP energy)
1 0.5 2.0
2 0.5 1.5

 

(I chose the pass1 values because these are the defaults in the MIP calibration code that I inherited from Alice. I chose the pass2 values becauseI found comments in the code that a previous calibration had used this cut.)

 

The plots above (and first attachment) shows the tower gains, averaged over all towers with the same value of eta, by eta bin number, for the archived 2006 calibrations as well as for passes 1 and 2 of the 2009 calibrations (and will include re-analyzing the 2006 data with my code, passes 1 and 2, soon).

The subsequent attachments contain plots that compare the 2009 gains to the 2006 gains. I named the attachment links below to identify the pass and layer, but the filenames that will download don't identify the pass and layer. The table identifies which file names correspond to which layer and pass:

  pass 1 pass 2
towers compareAllTow_3.pdf compareAllTow_4.pdf
SMDs compareAll.pdf compareAll_iter0_pass2.pdf
pre-/postshowers compareAllLayers_0.pdf compareAllLayers_1.pdf

 

The comparison plots for the towers and SMDs consistently show the drop in gains from 2006 to 2009 that we've seen before. The comparison plots for the preshower layers ("U" & "V") don't show a significant change from 2006 to 2009, while the plots for the postshower layer ("R") show a consistent rise in the gains.

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MIP Cut Variables

In the MIPs cut section of the code (runEEmcCalMaker.C), here are the variables and values used, along with comments in the code:

thrMipSmdE=0.4/1000 //min energy in smd strips using current gains

emptyStripCount=10 //empty strips on either side of 2 strip hit

offCenter=0.8 //fiducial area of tower =offCenter^2, was 0.8, CuCu was 0.7

twMipRelEneLow=0.5, twMipRelEneHigh=2.0 //range of energy in towers for it to be considered a mip (using current gains)

thrMipPresAdc=6 //thres over pedestal for pre/post (was 12 if no energy cut)

pMipRelEneLow=0.5, pMipReleEneHigh=2.0 //range of energy in pre/post for it to be considered a mip (using current gains)