CMS-DP-2013/016
2012 ECAL detector performance plots (2)

Abstract: Second collection of plots summarizing ECAL performance on 2012 data. First collection in CMS-DP-2013-007

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Figure Caption
pdf version
xtal transp loss.png
Crystal transparency loss behavior

Top plot: fit on dynamic model of color centers creation/recovery under irradiation to explain the changes of the crystal transparency. Each color center has 3 free parameters: creation rate, saturation level and recovery rate.
Bottom plot: instantaneous luminosity as a function of time.
N.B. this is an illustrative plot. Fit results are not used in the calibration. Only laser data (points) are used.
pdf version
phisymm evolution.png
Evolution of the φ-symmetry intercalibration constants in 2012

Time evolution of the standard deviation of the ratio distribution between two sets of inter-calibration constants (IC).
The intercalibration is performed with the φ-symmetry method for individual ECAL barrel crystals using 2012 data. The standard deviation is determined by a Gaussian fit to the ratio distribution.
pdf version
EB 2012 pi0.png

pdf version
EB 2012 eta0.png
π0/η invariant mass distributions with 2012 data

Top (bottom) plot: π0 (η) invariant mass peaks reconstructed in Barrel with 2012 data.
Spectrum fitted with a combination of a double (single) Gaussian for the signal and 4th (2th)order polynomial for the background.
The entire 2012 dataset is considered, using special online π0/η calibration streams. The sample size is determined by the rate of this calibration stream.
S/B and fitted resolution indicated on the plots.
The fitted peak positions are not exactly at the nominal π0/η mass values. This is mainly due to the effects of selective readout and leakage outside the 3x3 clusters used in the mass reconstruction.
Topic attachments
ISorted ascending Attachment History Action Size Date Who Comment
PDFpdf EB_2012_eta0.pdf r1 manage 16.6 K 2013-07-11 - 14:33 ToyokoOrimoto  
PDFpdf EB_2012_pi0.pdf r1 manage 16.8 K 2013-07-11 - 14:32 ToyokoOrimoto  
PDFpdf phisymm_evolution.pdf r1 manage 65.4 K 2013-07-11 - 14:31 ToyokoOrimoto  
PDFpdf xtal_transp_loss.pdf r1 manage 143.8 K 2013-07-11 - 14:30 ToyokoOrimoto  
PNGpng EB_2012_eta0.png r1 manage 112.7 K 2013-07-11 - 14:33 ToyokoOrimoto  
PNGpng EB_2012_pi0.png r1 manage 124.0 K 2013-07-11 - 14:32 ToyokoOrimoto  
PNGpng phisymm_evolution.png r1 manage 68.4 K 2013-07-11 - 14:31 ToyokoOrimoto  
PNGpng xtal_transp_loss.png r1 manage 180.0 K 2013-07-11 - 14:30 ToyokoOrimoto  
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Topic revision: r3 - 2013-07-12 - ToyokoOrimoto
 
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