Public page of the EWK Z+2j analysis

The public PAS is available here.
The Paper version is available on the arxiv and submitted to JHEP.

* Candidate signal event display: Recorded data pp collision at √s = 7 TeV, run 163759, event 41507939 featuring a central di-muon system with invariant mass 90.2 GeV and a forward-backward di-jet system with invariant mass 1.4 TeV. The first display shows a 3D view of the event, while the second one shows a rφ display, where the trasverse momentum balance of the 2μ + 2jets system is visible.
VBFZ-163759_41507939_63_3D.png VBFZ-163759_41507939_63_RhoPhi.png

* Figures from the paper in png format


  • Feynman.pngFeynman2.pngFeynman3.png
Figure 1: Representative diagrams for EW lljj production (for l=μ): VBF (left), bremsstrahlung (middle), and multiperipheral (right).


  • DY4.png
Figure 2: Representative diagram for Drell–Yan production in association with two jets.


  • detajj.pngptj.png
Figure 3: Distribution of the absolute difference in the pseudorapidity of the tagging jets, ∆ηj1j2 = |ηj1 − ηj2 | (left) and the tagging jet pT for both jets, j1 and j2 (right) for the DY μμjj, EW μμjj, and VBF Higgs boson production processes.


  • mumu_ptj1.png mumu_ptj2.png
Figure 4: The pTj1 (left) and pTj2 (right) distributions after applying the Zμμ selection and the TT jet tagging requirement TJ1. The expected contributions from the signal and background processes are evaluated from simulation. The bottom panels show the ratio of data over the expected contribution of the signal plus background. The region between the two lines with the labels JES Up and JES Down shows the 1 σ uncertainty of the simulation prediction due to the jet energy scale uncertainty. The data points are shown with the statistical uncertainties.

  • mumu_deta.pngmumu_ptz.png
Figure 5: The absolute difference in the pseudorapidity of the two tagging jets (left), and the dimuon pT (right) after the Zμμ selection and the tagging jet requirement TJ1. The expected contributions from the signal and background processes are evaluated from simulation. The bottom panels show the ratio of data over the expected contribution of the signal plus back- ground. The region between the two lines with the labels JES Up and JES Down shows the 1 σ uncertainty of the simulation prediction due to the jet energy scale uncertainty. The data points are shown with the statistical uncertainties.


  • ee_stjHT.pngmumu_stjHT.png
Figure 6: The HT distribution of the three leading soft track jets in the pseudorapidity interval between the tagging jets with pTj1,j2 > 65, 40 GeV in DY Zjj events for dielectron (left) and dimuon (right) channels. The bottom panels show the corresponding data/MC ratios. The data points are shown with the statistical uncertainties.


  • softHT_vs_Mjj.pngsoftHT_vs_dEta_jj.png
Figure 7: Average HT of the three leading soft track jets in the pseudorapidity gap between the tagging jets for pTj1,j2 > 65, 40 GeV as a function of the dijet invariant mass (left) and the dijet ∆ηj1j2 separation(right) for both the dielectron and dimuon channels in DY Zjj events. The data points and the points from simulation are shown with the statistical uncertainties.


  • nJets_vs_HT.pngcosDPhi_vs_HT.png
Figure 8: Average number of jets with pT > 40 GeV as a function of the their total HT in Z plus at least one jet events (left) and average cos ∆φj1j2 as a function of the total HT in DY Zjj events (right). The data points and the points from simulation are shown with the statistical uncertainties.


  • nJets_vs_dEta_jj.pngsoftHT_vs_dEta_jj.png
Figure 9: Average number of jets with pT > 40 GeV as a function of ∆ηj1j2 (left) and average cos∆φj1j2 as a function of ∆ηj1j2 separation (right) in DY Zjj events. The data points and the points from simulation are shown with the statistical uncertainties.


  • mumu_mjj_fit.png
Figure 10: The mj1j2 distribution after the Zμμ, TJ1, and YZ selections. The expected contributions from the dominant DY μμjj background and the EW μμjj signal processes are evaluated from a fit, while the contributions from the small tt and diboson backgrounds are estimated from simulation.The solid line with the label “EW only” shows the mj1j2 distribution for the signal alone. The bottom panel shows the ratio of data over the expected contribution of the signal plus background. The region between two lines, with the labels JES Up and JES Down, shows the 1 σ uncertainty due to the jet energy scale uncertainty. The data points are shown with the statistical uncertainties.


  • mumu_BDTD_No_fit.pngee_BDTD_No_fit.png
Figure 11: The BDT output distributions for the μ+μ− channel (left) and the e+e− channel (right) after applying the Zμμ and Zee selection criteria, respectively, with the tagging jet requirement TJ1. The expected contributions from the signal and background processes are evaluated from simulation. The solid line with the label “EW only” shows the BDT output distribution for the signal alone. The bottom panels show the ratio of data over the expected contribution of the signal plus background. The region between the two lines, with the labels JES Up and JES Down, shows the 1 σ uncertainty of the simulation prediction due to the jet energy scale uncertainty. The data points are shown with the statistical uncertainties.


  • Fig_11new_BDT_fit_diff8.pngee_BDTD_fit_Significance.png
Figure 12: The BDT output distributions for the μ+μ− (left) and e+e− (right) channels after the respective Zμμ and Zee selections and the tagging jet requirement TJ1. The expected contributions from the dominant DY lljj background and the EW lljj signal processes are evaluated from the fit. The contributions from the small tt and diboson backgrounds are estimated from simulation. The solid line with the label “EW only” shows the BDT output distribution for the signal alone. The bottom panels show the significance observed in data (histogram) and expected from simulation (solid purple line). The dashed blue line shows the background modeling uncertainty. The calculation of the significance and background modeling uncertainty are explained in the text. The data points are shown with the statistical uncertainties.

* Other figures from the PAS


  • Figure_006-a.pngFigure_006-b.png
Figure 6: Left: the dimuon pT after selections ”Zμμ” and (1) for the μ+μ− mode. Right: the mj1j2 after selections ”Zμμ”, (1) and (2) for the μ+μ− mode. The expected contributions from the signal and background processes are evaluated from simulation. The bottom panel shows the ratio of data over the expected contribution of the signal plus backgrounds along with the statistical uncertainties.


  • ee_ptj1.pngee_ptj2.png
Figure 7: The pTj1 (left) and pTj2 (right) after selections ”Zee” and (1) for the e+e− mode. The expected contributions from the signal and background processes are evaluated from simulation. The bottom panel shows the ratio of data over the expected contribution of the signal plus backgrounds along with the statistical uncertainties.


  • ee_etaj.pngee_yast.png
Figure 8: The |ηj| and |y*| after selections ”Zee” and (1) for the e+e− mode. The expected contributions from the signal and background processes are evaluated from simulation. The bottom panel shows the ratio of data over the expected contribution of the signal plus backgrounds along with the statistical uncertainties.


  • ee_deta.pngee_dphi.png
Figure 9: The absolute difference in the pseudorapidity of the two tagging jets (left) and the difference in the azimuthal angles of two tagging jets (right) after selections ”Zee” and (1) for the e+e− mode. The expected contributions from the signal and background processes are evaluated from simulation. The bottom panel shows the ratio of data over the expected contribution of the signal plus backgrounds along with the statistical uncertainties.


  • ee_ptz.pngee_mjj.png
Figure 10: Left: the dielectron pT after selections ”Zee” and (1) for the e+e− mode. Right: the mj1j2 after selections ”Zee”, (1) and (2) for the e+e− mode. The expected contributions from the signal and background processes are evaluated from simulation. The bottom panel shows the ratio of data over the expected contribution of the signal plus backgrounds along with the statistical uncertainties.


  • Figure_018-a.pngFigure_018-b.png
Figure 18: The gluon likelihood of the first (left) and second (right) tagging jets in the di-electron channel after the ”Zee” selection and requirement pTj1 > 65 GeV, pTj2 > 40 GeV, |eta_j| < 3.6. The expected contributions from the signal and background processes are evaluated from simulation. The bottom panel shows the ratio of data over the expected contribution of the signal plus backgrounds along with the statistical uncertainties.

-- MariaToms - 18-Dec-2012

Topic attachments
I Attachment History Action Size Date Who Comment
PNGpng DY4.png r1 manage 16.6 K 2013-06-03 - 15:30 PaoloAzzurri  
PNGpng Feynman.png r2 r1 manage 13.7 K 2013-06-03 - 21:31 PaoloAzzurri  
PNGpng Feynman2.png r2 r1 manage 12.2 K 2013-06-03 - 21:34 PaoloAzzurri  
PNGpng Feynman3.png r2 r1 manage 12.1 K 2013-06-03 - 21:34 PaoloAzzurri  
PNGpng Fig_11new_BDT_fit_diff8.png r1 manage 116.4 K 2013-06-04 - 11:15 PaoloAzzurri  
PNGpng Figure_005-b.png r1 manage 118.8 K 2012-11-13 - 10:03 MariaToms  
PNGpng Figure_006-a.png r1 manage 97.2 K 2012-11-13 - 10:05 MariaToms  
PNGpng Figure_006-b.png r1 manage 103.1 K 2012-11-13 - 10:05 MariaToms  
PNGpng VBFZ-163759_41507939_63_3D.png r1 manage 271.8 K 2013-04-26 - 10:13 PaoloAzzurri Event candidate
PNGpng VBFZ-163759_41507939_63_RhoPhi.png r1 manage 40.2 K 2013-04-26 - 11:03 PaoloAzzurri rhophi
PNGpng cosDPhi_vs_HT.png r1 manage 125.5 K 2013-06-04 - 11:30 PaoloAzzurri  
PNGpng cosDPhi_vs_dEta_jj.png r1 manage 115.2 K 2013-06-04 - 11:30 PaoloAzzurri  
PNGpng detajj.png r2 r1 manage 89.9 K 2013-06-03 - 15:40 PaoloAzzurri  
PNGpng ee_BDTD_No_fit.png r2 r1 manage 126.3 K 2013-06-04 - 11:15 PaoloAzzurri  
PNGpng ee_BDTD_fit_Significance.png r1 manage 117.8 K 2013-06-04 - 11:15 PaoloAzzurri  
PNGpng ee_deta.png r1 manage 111.0 K 2012-11-01 - 11:52 MariaToms Figure 9
PNGpng ee_dphi.png r1 manage 119.5 K 2012-11-01 - 11:52 MariaToms Figure 9
PNGpng ee_etaj.png r1 manage 102.3 K 2012-11-01 - 11:47 MariaToms Figure 8
PNGpng ee_mjj.png r1 manage 110.5 K 2012-11-01 - 11:55 MariaToms Figure 10
PNGpng ee_ptj1.png r1 manage 99.8 K 2012-11-01 - 11:41 MariaToms Figure 7
PNGpng ee_ptj2.png r1 manage 103.3 K 2012-11-01 - 11:41 MariaToms Figure 7
PNGpng ee_ptz.png r1 manage 101.9 K 2012-11-01 - 11:55 MariaToms Figure 10
PNGpng ee_stjHT.png r2 r1 manage 131.3 K 2013-06-04 - 09:50 PaoloAzzurri  
PNGpng ee_yast.png r1 manage 107.5 K 2012-11-01 - 11:47 MariaToms Figure 8
PNGpng mumu_BDTD_No_fit.png r2 r1 manage 120.7 K 2013-06-04 - 11:15 PaoloAzzurri  
PNGpng mumu_deta.png r2 r1 manage 121.1 K 2013-06-03 - 15:48 PaoloAzzurri  
PNGpng mumu_dphi.png r1 manage 143.3 K 2012-11-01 - 11:14 MariaToms Figure 5
PNGpng mumu_etaj.png r1 manage 108.2 K 2012-10-31 - 15:30 MariaToms Figure 4
PNGpng mumu_mjj_fit.png r3 r2 r1 manage 125.3 K 2013-06-04 - 11:15 PaoloAzzurri  
PNGpng mumu_ptj1.png r2 r1 manage 113.5 K 2013-06-03 - 15:45 PaoloAzzurri  
PNGpng mumu_ptj2.png r2 r1 manage 116.2 K 2013-06-03 - 15:45 PaoloAzzurri  
PNGpng mumu_ptz.png r2 r1 manage 115.7 K 2013-06-03 - 15:48 PaoloAzzurri  
PNGpng mumu_stjHT.png r2 r1 manage 130.0 K 2013-06-04 - 09:50 PaoloAzzurri  
PNGpng mumu_yast.png r1 manage 106.7 K 2012-10-31 - 15:30 MariaToms Figure 4
PNGpng nJets_vs_HT.png r2 r1 manage 122.5 K 2013-06-04 - 11:30 PaoloAzzurri  
PNGpng nJets_vs_dEta_jj.png r2 r1 manage 104.6 K 2013-06-04 - 11:30 PaoloAzzurri  
PNGpng ptj.png r2 r1 manage 84.4 K 2013-06-03 - 15:40 PaoloAzzurri  
PNGpng softHT_vs_Mjj.png r2 r1 manage 97.9 K 2013-06-04 - 10:07 PaoloAzzurri  
PNGpng softHT_vs_dEta_jj.png r2 r1 manage 111.4 K 2013-06-04 - 10:07 PaoloAzzurri  
GIFgif work.gif r1 manage 7.0 K 2013-06-03 - 15:54 PaoloAzzurri  
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