CMS-DP-2012/024
Photon Energy Scale with Z->mumugamma events

Abstract: Photon Energy Scale of the CMS Electromagnetic calorimeter, measured using FSR photons from Z->mumugamma events, based on the 2011 pp data sample.
Conclusion: The photon energy scale agrees to within 1.3 % between DATA and MC. The energy scale agrees to better than 0.5 % with that obtained using the method of DP 2012/007.

CDS entry

iCMS entry


Figure   Caption
pdf version
sdefinition.png
Definition of photon energy scale estimator, s, from Z->mumugamma final states. The terms are as follows: m_mumugamma is the reconstructed invariant mass of the Z->mumugamma final state; m_mumu is the reconstructed invariant mass of the mumu system, and m_Z is the PDG value of the Z boson. The energy scale value is extracted from the mean of an unbinned fit of a Voigtian function to the s distribution.
pdf version
s data allr9 eb.png
pdf version
s mc allr9 eb.png
Energy scale estimator, s, from Z->mumugamma final states for 2011 Data (left) and Monte Carlo simulation (right). All photons in the ECAL barrel, with transverse energy > 25 GeV are used.
pdf version
s data highr9 eb.png
pdf version
s mc highr9 eb.png
Energy scale estimator, s, from Z->mumugamma final states for 2011 Data (left) and Monte Carlo simulation (right). Photons in the ECAL barrel, with shower shape R9 > 0.94 and transverse energy > 25 GeV are used.
pdf version
s data allr9 ee.png
pdf version
s mc allr9 ee.png
Energy scale estimator, s, from Z->mumugamma final states for 2011 Data (left) and Monte Carlo simulation (right). All photons in the ECAL endcaps, with transverse energy > 25 GeV are used.
pdf version
Data MC Pt Comparison eb allr9.png
pdf version
Data MC Pt Comparison eb allr9 log.png
Transverse energy distribution of selected photons from Z->mumugamma final states for 2011 Data (left) and Monte Carlo simulation (right). All photons in the ECAL barrel, with transverse energy > 25 GeV are used.
pdf version
Data MC Pt Comparison eb highr9.png
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Data MC Pt Comparison eb highr9 log.png
As above, but for photons in the ECAL barrel with R9>0.9 and transverse energy > 25 GeV.
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Data MC Pt Comparison ee allr9.png
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Data MC Pt Comparison ee allr9 log.png
As above, but for all photons in the ECAL endcaps, with transverse energy > 25 GeV.
pdf version
Data MC Pt Comparison ecal allr9.png
pdf version
Data MC Pt Comparison ecal allr9 log.png
As above, but for photons in either the ECAL barrel or endcaps, with transverse energy > 25 GeV.
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PDFpdf Data_MC_Pt_Comparison_eb_allr9.pdf r1 manage 16.3 K 2013-07-11 - 17:43 ToyokoOrimoto  
PNGpng Data_MC_Pt_Comparison_eb_allr9.png r1 manage 17.2 K 2013-07-11 - 17:45 ToyokoOrimoto  
PDFpdf Data_MC_Pt_Comparison_eb_allr9_log.pdf r1 manage 16.6 K 2013-07-11 - 17:43 ToyokoOrimoto  
PNGpng Data_MC_Pt_Comparison_eb_allr9_log.png r1 manage 20.1 K 2013-07-11 - 17:45 ToyokoOrimoto  
PDFpdf Data_MC_Pt_Comparison_eb_highr9.pdf r1 manage 15.6 K 2013-07-11 - 17:43 ToyokoOrimoto  
PNGpng Data_MC_Pt_Comparison_eb_highr9.png r1 manage 14.7 K 2013-07-11 - 17:45 ToyokoOrimoto  
PDFpdf Data_MC_Pt_Comparison_eb_highr9_log.pdf r1 manage 16.3 K 2013-07-11 - 17:43 ToyokoOrimoto  
PNGpng Data_MC_Pt_Comparison_eb_highr9_log.png r1 manage 18.8 K 2013-07-11 - 17:45 ToyokoOrimoto  
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PDFpdf Data_MC_Pt_Comparison_ecal_allr9_log.pdf r1 manage 16.7 K 2013-07-11 - 17:43 ToyokoOrimoto  
PNGpng Data_MC_Pt_Comparison_ecal_allr9_log.png r1 manage 19.9 K 2013-07-11 - 17:45 ToyokoOrimoto  
PDFpdf Data_MC_Pt_Comparison_ee_allr9.pdf r1 manage 15.7 K 2013-07-11 - 17:43 ToyokoOrimoto  
PNGpng Data_MC_Pt_Comparison_ee_allr9.png r1 manage 16.0 K 2013-07-11 - 17:46 ToyokoOrimoto  
PDFpdf Data_MC_Pt_Comparison_ee_allr9_log.pdf r1 manage 16.0 K 2013-07-11 - 17:43 ToyokoOrimoto  
PNGpng Data_MC_Pt_Comparison_ee_allr9_log.png r1 manage 17.0 K 2013-07-11 - 17:46 ToyokoOrimoto  
PDFpdf s_data_allr9_eb.pdf r1 manage 16.3 K 2013-07-11 - 17:43 ToyokoOrimoto  
PNGpng s_data_allr9_eb.png r1 manage 15.2 K 2013-07-11 - 17:43 ToyokoOrimoto  
PDFpdf s_data_allr9_ee.pdf r1 manage 16.3 K 2013-07-11 - 17:45 ToyokoOrimoto  
PNGpng s_data_allr9_ee.png r1 manage 15.4 K 2013-07-11 - 17:46 ToyokoOrimoto  
PDFpdf s_data_highr9_eb.pdf r1 manage 16.6 K 2013-07-11 - 17:45 ToyokoOrimoto  
PNGpng s_data_highr9_eb.png r1 manage 17.6 K 2013-07-11 - 17:46 ToyokoOrimoto  
PDFpdf s_mc_allr9_eb.pdf r1 manage 16.3 K 2013-07-11 - 17:47 ToyokoOrimoto  
PNGpng s_mc_allr9_eb.png r1 manage 16.4 K 2013-07-11 - 17:48 ToyokoOrimoto  
PDFpdf s_mc_allr9_ee.pdf r1 manage 16.2 K 2013-07-11 - 17:45 ToyokoOrimoto  
PNGpng s_mc_allr9_ee.png r1 manage 15.0 K 2013-07-11 - 17:46 ToyokoOrimoto  
PDFpdf s_mc_highr9_eb.pdf r1 manage 16.4 K 2013-07-11 - 17:45 ToyokoOrimoto  
PNGpng s_mc_highr9_eb.png r1 manage 16.4 K 2013-07-11 - 17:46 ToyokoOrimoto  
PDFpdf sdefinition.pdf r1 manage 65.9 K 2013-07-11 - 17:37 ToyokoOrimoto  
PNGpng sdefinition.png r1 manage 12.7 K 2013-07-11 - 17:37 ToyokoOrimoto  
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