-- AminaZghiche - 2020-02-19

CMS DP-2020/021

CMS ECAL Performance for Ultra Legacy re-reconstruction of Run2

Abstract: CMS ECAL , calibration and performance Run2 ultra legacy re-reconstruction. Summary plots

CDS entry

iCMS entry



FigureSorted ascending Caption
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final medianmeevstimeinEB rotate.png

Time stability of the di-electron invariant mass distribution for the full Run2 data-taking period using Z→ee.

The plot shows the time stability of the median di-electron invariant mass with a refined re-calibration performed in 2019 for the full Run2 dataset. Both electrons are required to be in the ECAL Barrel. Each time bin has around 10,000 events. The error bar on the points denotes the statistical uncertainty on the median, which is evaluated as the central 95% interval of medians obtained from 200 "bootstrap" re-samplings. The right panel shows the distribution of the medians. At the analysis level, residual drifts in the energy scale with time are corrected for in approximately 18-hour intervals corresponding to at most one LHC fill.

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final medianR9eLvstimeinEB rotate.png

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final medianR9eLvstimeinEE rotate.png

Stability of the shower shape of the electromagnetic deposit in the ECAL for the leading electron from Z decays.

The plot shows the time stability of the shower shape of the leading electron in Z decays with a refined re-calibration performed in 2019 for the full Run2 dataset. The event selection requires two electrons to be in the ECAL Barrel or in the ECAL Endcaps. Each time bin has around 10,000 events. The error bar on the points denotes the statistical uncertainty on the median, which is evaluated as the central 95% interval of medians obtained from 200 "bootstrap" re-samplings. The right panel shows the distribution of the medians. The shower shape is measured by the variable R9, defined as the ratio of the energy deposit in the 3x3 crystal matrix around the seed crystal to that in the supercluster. R9 is responsive to changes in pedestal and noise.

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final mee in EB fixedWidthNoFitLine.png

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final mee in EE fixedWidthNoFitLine.png

Invariant mass distribution for electron pairs from Z boson decays.

The plot shows the invariant mass distribution comparing 2016, 2017, and 2018 data-taking period using Z→ee events with a refined re-calibration performed in 2019 for the full Run2 dataset. The event selection requires two electrons to be in the ECAL Barrel or in the ECAL Endcaps. For candidates in the Endcaps, the electron pseudorapidity is required to be lower than 2.5.

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final mee in EB HighR92 fixedWidthNoFitLine.png

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final mee in EE HighR92 fixedWidthNoFitLine.png

Invariant mass distribution for electron pairs from Z boson decays using low-bremsstrahlung electrons.

The plot shows the invariant mass distribution comparing 2016, 2017, and 2018 data-taking period using Z→ee events with a refined re-calibration performed in 2019 for the full Run2 dataset. The event selection requires two electrons to be in the ECAL Barrel or in the ECAL Endcaps. For candidates in the Endcaps, the electron pseudorapidity is required to be lower than 2.5.

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final mee in EB LowR92 fixedWidthNoFitLine.png

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final mee in EE LowR92 fixedWidthNoFitLine.png

Invariant mass distribution for electron pairs from Z boson decays using high-bremsstrahlung electrons.

The plot shows the invariant mass distribution comparing 2016, 2017, and 2018 data-taking period using Z→ee events with a refined re-calibration performed in 2019 for the full Run2 dataset. The event selection requires two electrons to be in the ECAL Barrel or in the ECAL Endcaps. For candidates in the Endcaps, the electron pseudorapidity is required to be lower than 2.5.

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final Resolution Inclusive barrel.png

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final Resolution LowBremsstrahlung barrel.png

Relative electron (ECAL) energy resolution unfolded in bins of pseudorapidity η for the ECAL Barrel. Electrons from Z→ee decays are used. The resolution is shown separately for low bremsstrahlung electrons and for all electrons ("inclusive"). The plot compares the resolution achieved after a refined calibration of the data collected during Run 1 (2012) at 8 TeV, and Run 2 (2016, 2017, and 2018) at 13 TeV. The relative resolution σE/E is extracted from an unbinned likelihood fit to Z→ee events, using a Voigtian (Breit-Wigner convolved with Gaussian) as the signal model. A stable ECAL energy resolution is observed over the course of Run 2 and in comparison with Run 1 despite the increased LHC luminosity and the ageing of the detector.

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final Resolution RunII Inclusive.png

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final Resolution RunII LowBremsstrahlung.png

Relative electron (ECAL) energy resolution unfolded in bins of pseudorapidity η for the ECAL Barrel and Endcap. Electrons from Z→ee decays are used. The resolution is shown separately for low bremsstrahlung electrons, and for all electrons ("inclusive"). The plot compares the resolution achieved after a refined calibration of the data collected at 13 TeV during Run 2 in 2016, 2017, and 2018. The relative resolution σE/E is extracted from an unbinned likelihood fit to Z→ee events, using a Voigtian (Breit-Wigner convolved with Gaussian) as the signal model. A stable ECAL energy resolution is observed over the course of Run 2 despite the increased LHC luminosity and the ageing of the detector.

pdf version
final Precision RunII.png

Residual mis-calibration of the ECAL channel inter-calibration, as a function of pseudorapidity with the dataset recorded during LHC Run 2.

The calibration is obtained by combining three methods: electrons from Z→ee decays using the known Z boson mass as energy reference, electrons from W and Z boson decays using the tracker momentum as energy reference, and photons from π0→γγ decays are used by the calibration methods. The combination is performed by weighting the different methods relatively to their energy resolution performance as measured in Z→ee decays. For |η|>2.5, only Z→ee decays are used. The dashed-line represents the end of the Ecal Barrel (|η| < 1.49), while the full line refers to the end of the tracker acceptance (|η| < 2.5). For the very forward electrons (|η| >2.5), the degradation of the precision is explained by the usage of a single calibration method, the lower intrinsic ECAL performance, and the degraded triggering capability due to the absence of tracker. This shows a good stability overtime of the calibration precision despite the increase of the LHC luminosity and the ageing of the detector.

Topic attachments
I Attachment History Action Size Date Who Comment
PDFpdf Resolution_Inclusive_barrel.pdf r3 r2 r1 manage 16.4 K 2020-04-02 - 23:10 MarcoCipriani  
PDFpdf Resolution_LowBremsstrahlung_barrel.pdf r3 r2 r1 manage 16.5 K 2020-04-02 - 23:10 MarcoCipriani  
PDFpdf Resolution_RunII_HighBremsstrahlung.pdf r3 r2 r1 manage 17.2 K 2020-04-02 - 23:11 MarcoCipriani  
PDFpdf Resolution_RunII_Inclusive.pdf r3 r2 r1 manage 17.1 K 2020-04-02 - 23:11 MarcoCipriani  
PDFpdf Resolution_RunII_LowBremsstrahlung.pdf r3 r2 r1 manage 17.2 K 2020-04-02 - 23:11 MarcoCipriani  
PDFpdf final_Precision_RunII.pdf r1 manage 118.5 K 2020-04-24 - 23:27 MarcoCipriani  
PNGpng final_Precision_RunII.png r1 manage 100.4 K 2020-04-24 - 23:27 MarcoCipriani  
PDFpdf final_Resolution_Inclusive_barrel.pdf r1 manage 16.4 K 2020-04-24 - 23:28 MarcoCipriani  
PNGpng final_Resolution_Inclusive_barrel.png r1 manage 19.1 K 2020-04-24 - 23:28 MarcoCipriani  
PDFpdf final_Resolution_LowBremsstrahlung_barrel.pdf r1 manage 16.5 K 2020-04-24 - 23:28 MarcoCipriani  
PNGpng final_Resolution_LowBremsstrahlung_barrel.png r1 manage 19.9 K 2020-04-24 - 23:28 MarcoCipriani  
PDFpdf final_Resolution_RunII_Inclusive.pdf r1 manage 17.1 K 2020-04-24 - 23:28 MarcoCipriani  
PNGpng final_Resolution_RunII_Inclusive.png r1 manage 18.6 K 2020-04-24 - 23:28 MarcoCipriani  
PDFpdf final_Resolution_RunII_LowBremsstrahlung.pdf r1 manage 17.2 K 2020-04-24 - 23:28 MarcoCipriani  
PNGpng final_Resolution_RunII_LowBremsstrahlung.png r1 manage 19.6 K 2020-04-24 - 23:28 MarcoCipriani  
PDFpdf final_medianR9eLvstimeinEB_rotate.pdf r1 manage 206.0 K 2020-04-24 - 23:25 MarcoCipriani  
PNGpng final_medianR9eLvstimeinEB_rotate.png r1 manage 56.4 K 2020-04-24 - 23:25 MarcoCipriani  
PDFpdf final_medianR9eLvstimeinEE_rotate.pdf r1 manage 46.1 K 2020-04-24 - 23:25 MarcoCipriani  
PNGpng final_medianR9eLvstimeinEE_rotate.png r1 manage 49.6 K 2020-04-24 - 23:25 MarcoCipriani  
PDFpdf final_medianmeevstimeinEB_rotate.pdf r1 manage 207.3 K 2020-04-24 - 23:25 MarcoCipriani  
PNGpng final_medianmeevstimeinEB_rotate.png r1 manage 80.7 K 2020-04-24 - 23:25 MarcoCipriani  
PDFpdf final_mee_in_EB_HighR92_fixedWidthNoFitLine.pdf r1 manage 25.0 K 2020-04-24 - 23:25 MarcoCipriani  
PNGpng final_mee_in_EB_HighR92_fixedWidthNoFitLine.png r1 manage 77.4 K 2020-04-24 - 23:25 MarcoCipriani  
PDFpdf final_mee_in_EB_LowR92_fixedWidthNoFitLine.pdf r1 manage 25.0 K 2020-04-24 - 23:27 MarcoCipriani  
PNGpng final_mee_in_EB_LowR92_fixedWidthNoFitLine.png r1 manage 80.2 K 2020-04-24 - 23:27 MarcoCipriani  
PDFpdf final_mee_in_EB_fixedWidthNoFitLine.pdf r1 manage 25.0 K 2020-04-24 - 23:25 MarcoCipriani  
PNGpng final_mee_in_EB_fixedWidthNoFitLine.png r1 manage 77.5 K 2020-04-24 - 23:25 MarcoCipriani  
PDFpdf final_mee_in_EE_HighR92_fixedWidthNoFitLine.pdf r1 manage 25.2 K 2020-04-24 - 23:27 MarcoCipriani  
PNGpng final_mee_in_EE_HighR92_fixedWidthNoFitLine.png r1 manage 90.4 K 2020-04-24 - 23:27 MarcoCipriani  
PDFpdf final_mee_in_EE_LowR92_fixedWidthNoFitLine.pdf r1 manage 25.1 K 2020-04-24 - 23:27 MarcoCipriani  
PNGpng final_mee_in_EE_LowR92_fixedWidthNoFitLine.png r1 manage 84.6 K 2020-04-24 - 23:27 MarcoCipriani  
PDFpdf final_mee_in_EE_fixedWidthNoFitLine.pdf r1 manage 25.0 K 2020-04-24 - 23:27 MarcoCipriani  
PNGpng final_mee_in_EE_fixedWidthNoFitLine.png r1 manage 84.7 K 2020-04-24 - 23:27 MarcoCipriani  
PDFpdf medianR9eLvstimeinEB.pdf r4 r3 r2 r1 manage 205.9 K 2020-03-31 - 22:46 MarcoCipriani  
PDFpdf medianR9eLvstimeinEB_rotate.pdf r1 manage 206.0 K 2020-03-25 - 17:04 JinWang  
PDFpdf medianR9eLvstimeinEE.pdf r4 r3 r2 r1 manage 46.1 K 2020-03-31 - 22:46 MarcoCipriani  
PDFpdf medianR9eLvstimeinEE_rotate.pdf r1 manage 46.1 K 2020-03-25 - 17:04 JinWang  
PDFpdf medianmeevstimeinEB.pdf r4 r3 r2 r1 manage 207.2 K 2020-03-31 - 22:46 MarcoCipriani  
PDFpdf medianmeevstimeinEB_rotate.pdf r1 manage 207.3 K 2020-03-25 - 17:04 JinWang  
PDFpdf medianmeevstimeinEE.pdf r4 r3 r2 r1 manage 47.6 K 2020-03-31 - 22:46 MarcoCipriani  
PDFpdf medianmeevstimeinEE_rotate.pdf r1 manage 47.5 K 2020-03-25 - 17:04 JinWang  
PDFpdf mee_in_EB_HighR92_fixedWidthNoFitLine.pdf r3 r2 r1 manage 25.0 K 2020-03-31 - 22:45 MarcoCipriani  
PDFpdf mee_in_EB_LowR92_fixedWidthNoFitLine.pdf r3 r2 r1 manage 25.0 K 2020-03-31 - 22:45 MarcoCipriani  
PDFpdf mee_in_EB_fixedWidthNoFitLine.pdf r5 r4 r3 r2 r1 manage 25.0 K 2020-03-31 - 22:45 MarcoCipriani  
PDFpdf mee_in_EB_fixedWidthNoFitLine_final.pdf r1 manage 25.0 K 2020-03-25 - 17:09 JinWang  
PDFpdf mee_in_EE_HighR92_fixedWidthNoFitLine.pdf r3 r2 r1 manage 25.2 K 2020-03-31 - 22:45 MarcoCipriani  
PDFpdf mee_in_EE_LowR92_fixedWidthNoFitLine.pdf r3 r2 r1 manage 25.1 K 2020-03-31 - 22:46 MarcoCipriani  
PDFpdf mee_in_EE_fixedWidthNoFitLine.pdf r5 r4 r3 r2 r1 manage 25.0 K 2020-03-31 - 22:45 MarcoCipriani  
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