ECAL performance plots approval for EPS 2015, contained in CMS DPS 2015-016.

Plots

Figure Caption
pdf version
histories 2011-2012-2015.png

History of relative response

Relative response to laser light (440 nm in 2011 and 447 nm from 2012 onwards) injected in the ECAL crystals, measured by the ECAL laser monitoring system, averaged over all crystals in bins of pseudorapidity, for the 2011, 2012 and early 2015 data taking periods. The response change observed in the ECAL channels is up to 6% in the barrel and it reaches up to 30% at η ~ 2.5, the limit of the tracker acceptance. The response change is up to 70% in the region closest to the beam pipe. The recovery of the crystal response during the Long-Shutdown-1 period is visible. The response is not fully recovered, particularly in the region closest to the beam pipe. These measurements are used to correct the physics data. This is an update of the plots appearing in CMS-DP-2012/007 and CMS-DP2012/015, and includes measurements taken up to July, 09th 2015. The bottom plot shows the instantaneous LHC luminosity delivered during this time period.

pdf version
multifit EB.png

Example of rechit reconstruction in EB on 25ns MC

Example of fitted pulses for simulated events with 20 average pileup interactions and 25 ns bunch spacing, for a signal in the barrel. Dots represent the 10 digitized samples, the red distributions (other light colors) represent the fitted in-time (out-of time) pulses with positive amplitude. The dark blue histograms represent the sum of all the fitted contributions. Plot contained in CMS-CR-2014/410.

pdf version
multifit EE.png

Example of rechit reconstruction in EE on 25ns MC

Example of fitted pulses for simulated events with 20 average pileup interactions and 25 ns bunch spacing, for a signal in the endcaps. Dots represent the 10 digitized samples, the red distributions (other light colors) represent the fitted in-time (out-of time) pulses with positive amplitude. The dark blue histograms represent the sum of all the fitted contributions. Plot contained in CMS-CR-2014/410.

pdf version
h rechit energy EB noratio.png

Comparison of rechit energy in EB between first 2015 Data and MC with B-off

Comparison of rechit energy in EB, between first 2015 Data and MC at 50 ns bunch spacing with very low pile-up and B-off. An energy selection of 500 MeV and the goodness of the rechit amplitude fit are required in order to reject anomalous signals in data.

pdf version
mZee barrel.png

Z->ee invariant mass plot for 2015 data, from the reconstruction of di-electron events with both electrons in the ECAL Barrel

;The plot includes only electrons reconstructed in the ECAL barrel. The calibrations applied to these early 50ns RunII data are the Run1 ones, extrapolated in time using the laser measurements only. The simulation is not tuned in terms of the noise observed in this dataset, and assumes a calibration precision that will be achieved at the end of the 50ns LHC run (not yet applied to the data). No attempt of pileup reweighting is done. Data and MC are normalized to the same entries

pdf version
mZee endcap.png

Z->ee invariant mass plot for 2015 data, from the reconstruction of di-electron events with both electrons in the ECAL Endcap

The plot includes only electrons reconstructed in the ECAL endcap. The calibrations applied to these early 50ns RunII data are the Run1 ones, extrapolated in time using the laser measurements only. The simulation is not tuned in terms of the noise observed in this dataset, and assumes a calibration precision that will be achieved at the end of the 50ns LHC run (not yet applied to the data). No attempt of pileup reweighting is done. Data and MC are normalized to the same entries

-- AlessioGhezzi - 2015-08-07
Topic attachments
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PDFpdf h_rechit_energy_EB_noratio.pdf r1 manage 42.8 K 2015-08-07 - 16:52 AlessioGhezzi  
PNGpng h_rechit_energy_EB_noratio.png r1 manage 17.9 K 2015-08-07 - 15:51 AlessioGhezzi  
PDFpdf histories_2011-2012-2015.pdf r1 manage 8401.6 K 2015-08-07 - 17:02 AlessioGhezzi  
PNGpng histories_2011-2012-2015.png r1 manage 159.0 K 2015-08-07 - 15:51 AlessioGhezzi  
PNGpng mZee_barrel.png r1 manage 1337.6 K 2015-08-07 - 16:52 AlessioGhezzi  
PNGpng mZee_endcap.png r1 manage 1337.6 K 2015-08-07 - 16:52 AlessioGhezzi  
PDFpdf multifit_EB.pdf r1 manage 41.9 K 2015-08-07 - 16:52 AlessioGhezzi  
PNGpng multifit_EB.png r1 manage 79.0 K 2015-08-07 - 15:51 AlessioGhezzi  
PDFpdf multifit_EE.pdf r1 manage 41.2 K 2015-08-07 - 16:52 AlessioGhezzi  
PNGpng multifit_EE.png r1 manage 83.0 K 2015-08-07 - 15:51 AlessioGhezzi  
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Topic revision: r2 - 2015-08-07 - AlessioGhezzi
 
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