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
I AttachmentSorted descending History Action Size Date Who Comment
PNGpng xtal_transp_loss.png r1 manage 180.0 K 2013-07-11 - 14:30 ToyokoOrimoto  
PDFpdf xtal_transp_loss.pdf r1 manage 143.8 K 2013-07-11 - 14:30 ToyokoOrimoto  
PNGpng phisymm_evolution.png r1 manage 68.4 K 2013-07-11 - 14:31 ToyokoOrimoto  
PDFpdf phisymm_evolution.pdf r1 manage 65.4 K 2013-07-11 - 14:31 ToyokoOrimoto  
PNGpng EB_2012_pi0.png r1 manage 124.0 K 2013-07-11 - 14:32 ToyokoOrimoto  
PDFpdf EB_2012_pi0.pdf r1 manage 16.8 K 2013-07-11 - 14:32 ToyokoOrimoto  
PNGpng EB_2012_eta0.png r1 manage 112.7 K 2013-07-11 - 14:33 ToyokoOrimoto  
PDFpdf EB_2012_eta0.pdf r1 manage 16.6 K 2013-07-11 - 14:33 ToyokoOrimoto  
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Topic revision: r3 - 2013-07-12 - ToyokoOrimoto
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