Updated results on the new boson discovered in the search for the standard model Higgs boson in the H → ZZ → 4l channel in pp collisions at √s = 7 and 8 TeV

Table of contents

Abstract

Measurements of the properties of the new boson recently observed at a mass near 125 GeV in the CMS experiment are reported. The results are obtained from a comprehensive search for the standard model Higgs boson in the H → ZZ decay channel, where both Z's decay to electron, muon, or tau lepton pairs. The search covers Higgs boson mass hypotheses in the range 110 < mH < 1000 GeV. The analysis uses pp collision data recorded by the CMS detector at the LHC, corresponding to integrated luminosities of 5.1 fb-1 at sqrt(s) = 7 TeV and 12.2 fb-1 at sqrt(s)= 8 TeV. The new boson is observed with a local significance above the expected background of 4.5 standard deviations. The signal strength mu, relative to the expectation for the standard model Higgs boson, is measured to be mu = 0.80^{+ 0.35}_{-0.28} at 126 GeV. A measurement of its mass gives 126.2 +/- 0.6 (stat) +/- 0.2 (syst) GeV. The hypothesis 0+ of the standard model for the spin J=0 and parity P=+1 quantum numbers is found to be consistent with the observation. Under the assumption that the observed boson has spin zero the data disfavor the pseudoscalar hypothesis 0- with a CLs value of 2.4%. No other significant excess is found, and upper limits at 95% confidence level exclude the ranges 113--116 GeV and 129--720 GeV while the expected exclusion range for the standard model Higgs boson is 118--670 GeV.

4l plots:

Mass plots

7 TeV + 8 TeV

Figure Label Description
eps,png Distribution of the four-lepton reconstructed mass in [70-800] GeV mass range (10 GeV bin) for the sum of the 4e, 4μ, and 2e2μ channels. Points represent the data, shaded histograms represent the background and unshaded histogram the signal expectations. The distributions are presented as stacked histograms. The measurements are presented for the sum of the data collected at √s = 7 TeV and √s = 8 TeV.
eps,png Distribution of the four-lepton reconstructed mass in [100-800] GeV mass range (10 GeV bin) for the sum of the 4e, 4μ, and 2e2μ channels. Points represent the data, shaded histograms represent the background and unshaded histogram the signal expectations. The distributions are presented as stacked histograms. The measurements are presented for the sum of the data collected at √s = 7 TeV and √s = 8 TeV.
eps,png Distribution of the four-lepton reconstructed mass in [70-180] GeV mass range (3 GeV bin) for the sum of the 4e, 4μ, and 2e2μ channels. Points represent the data, shaded histograms represent the background and unshaded histogram the signal expectations. The distributions are presented as stacked histograms. The measurements are presented for the sum of the data collected at √s = 7 TeV and √s = 8 TeV.
eps,png Distribution of the four-lepton reconstructed mass in [100-180] GeV mass range (3 GeV bin) for the sum of the 4e, 4μ, and 2e2μ channels. Points represent the data, shaded histograms represent the background and unshaded histogram the signal expectations. The distributions are presented as stacked histograms. The measurements are presented for the sum of the data collected at √s = 7 TeV and √s = 8 TeV.
eps,png,pdf Distribution of the Z1 reconstructed mass for the sum of the 4e, 4μ, and 2e2μ channels for events with the four-lepton reconstructed mass > 100 GeV. Points represent the data, shaded histograms represent the background and unshaded histogram the signal expectations. The measurements are presented for the sum of the data collected at √s = 7 TeV and √s = 8 TeV.
eps,png,pdf Distribution of the Z2 reconstructed mass for the sum of the 4e, 4μ, and 2e2μ channels for events with the four-lepton reconstructed mass > 100 GeV. Points represent the data, shaded histograms represent the background and unshaded histogram the signal expectations. The measurements are presented for the sum of the data collected at √s = 7 TeV and √s = 8 TeV.
eps,png,pdf Distribution of the four-lepton reconstructed mass in [100-180] GeV mass range (3 GeV bin) for the sum of the4e, 4μ, and 2e2μ channels for events with a value of MELA KD > 0.5. Points represent the data, shaded histograms represent the background and unshaded histogram the signal expectations. The measurements are presented for the sum of the data collected at √s = 7 TeV and √s = 8 TeV.
eps,png,pdf Distribution of the four-lepton reconstructed mass in [100-180] GeV mass range (3 GeV bin) for the sum of the4e, 4μ, and 2e2μ channels for events with a value of MELA KD > 0.3. Points represent the data, shaded histograms represent the background and unshaded histogram the signal expectations. The measurements are presented for the sum of the data collected at √s = 7 TeV and √s = 8 TeV.

7 TeV

Figure Label Description
eps,png Distribution of the four-lepton reconstructed mass in [100-800] GeV mass range (10 GeV bin) for the sum of the 4e, 4μ, and 2e2μ channels. Points represent the data, shaded histograms represent the background and unshaded histogram the signal expectations. The distributions are presented as stacked histograms. The measurements are presented for the data collected at √s = 7 TeV.
eps,png Distribution of the four-lepton reconstructed mass in [70-180] GeV mass range (3 GeV bin) for the sum of the 4e, 4μ, and 2e2μ channels. Points represent the data, shaded histograms represent the background and unshaded histogram the signal expectations. The distributions are presented as stacked histograms. The measurements are presented for the data collected at √s = 7 TeV.

8 TeV

Figure Label Description
eps,png Distribution of the four-lepton reconstructed mass in [100-800] GeV mass range (10 GeV bin) for the sum of the 4e, 4μ, and 2e2μ channels. Points represent the data, shaded histograms represent the background and unshaded histogram the signal expectations. The distributions are presented as stacked histograms. The measurements are presented for the data collected at √s = 8 TeV.
eps,png Distribution of the four-lepton reconstructed mass in [70-180] GeV mass range (3 GeV bin) for the sum of the 4e, 4μ, and 2e2μ channels. Points represent the data, shaded histograms represent the background and unshaded histogram the signal expectations. The distributions are presented as stacked histograms. The measurements are presented for the data collected at √s = 8 TeV.

KD

Figure Label Description
eps,png,pdf Distribution of the MELA discriminant of the four-lepton candidates with reconstructed mass > 100 GeV for the sum of the 4e, 4μ, and 2e2μ channels. Points represent the data, shaded histograms represent the background. The measurements are presented for the sum of the data collected at √s = 7 TeV and √s = 8 TeV.
eps,png,pdf Distribution of the MELA discriminant of the four-lepton candidates in [100-180] GeV mass range for the sum of the 4e, 4μ, and 2e2μ channels. Points represent the data, shaded histograms represent the background and unshaded histogram the signal expectations. The measurements are presented for the sum of the data collected at √s = 7 TeV and √s = 8 TeV.

MELA KD vs. m4l

Figure Label Description
eps,png Distribution of the MELA KD versus the four-lepton reconstructed mass m4l in the low-mass range [100-180] GeV. The points representing the individual events are shown together with their reconstructed mass uncertainties. The contours represent the background expectation.
eps,png Distribution of the MELA KD versus the four-lepton reconstructed mass m4l in the low-mass range [180-800] GeV. The points representing the individual events are shown together with their reconstructed mass uncertainties. The contours represent the background expectation.
eps,png Distribution of the MELA KD versus the four-lepton reconstructed mass m4l in the low-mass range [100-180] GeV. The points representing the individual events are shown together with their reconstructed mass uncertainties. The contours represent the signal expectation (mH = 126 GeV).

Distributions with 121.5 GeV < m4l < 130.5 GeV

Figure Label Description
eps,png Distribution of the Kinematic Discriminant (KD) of the four-lepton candidates in [121.5-130.5] GeV mass range for the sum of the 4e, 4μ, and 2e2μ channels. Points represent the data, shaded histograms represent the background and unshaded histogram the signal expectations. The measurements are presented for the sum of the data collected at √s = 7 TeV and √s = 8 TeV.
eps,png Distribution of the Z1 reconstructed mass (4 GeV bin) of the four-lepton candidates in [121.5-130.5] GeV mass range for the sum of the 4e, 4μ, and 2e2μ channels. Points represent the data, shaded histograms represent the background and unshaded histogram the signal expectations. The measurements are presented for the sum of the data collected at √s = 7 TeV and √s = 8 TeV.
eps,png Distribution of the Z2 reconstructed mass (4 GeV bin) of the four-lepton candidates in [121.5-130.5] GeV mass range for the sum of the 4e, 4μ, and 2e2μ channels. Points represent the data, shaded histograms represent the background and unshaded histogram the signal expectations. The measurements are presented for the sum of the data collected at √s = 7 TeV and √s = 8 TeV.
pdf,png Distribution of the Z1 reconstructed mass versus the four-lepton reconstructed mass of the four-lepton candidates in [121.5-130.5] GeV mass range for the the 4e, 4μ, and 2e2μ channels. Points represent the data, shaded histograms represent the signal expectations (mH = 126 GeV). The measurements are presented for the sum of the data collected at √s = 7 TeV and √s = 8 TeV.
pdf,png Distribution of the Z2 reconstructed mass versus the four-lepton reconstructed mass of the four-lepton candidates in [121.5-130.5] GeV mass range for the the 4e, 4μ, and 2e2μ channels. Points represent the data, shaded histograms represent the signal expectations (mH = 126 GeV). The measurements are presented for the sum of the data collected at √s = 7 TeV and √s = 8 TeV.
pdf,png Distribution of the Z2 reconstructed mass versus the Z1 reconstructed mass of the four-lepton candidates in [121.5-130.5] GeV mass range for the the 4e, 4μ, and 2e2μ channels. Points represent the data, shaded histograms represent the signal expectations (mH = 126 GeV). The measurements are presented for the sum of the data collected at √s = 7 TeV and √s = 8 TeV.

Background Control

Figure Label Description
Zee: png, eps
Zmumu: png, eps
Probability for a reconstructed electron to pass identification and isolation requirements (electron fake ratios), as measured in either Z->ee or Z->mumu+ e_reco samples in 2012 data, for electrons in ECAL barrel (red) or ECAL endcaps (blue).
Zee: png, eps
Zmumu: png, eps
Probability for a reconstructed muon to pass identification and isolation requirements (muon fake ratios), as measured in either Z->ee or Z->mumu+ mu_reco samples in 2012 data, for muons in barrel (red) or endcaps (blue).
SS-SF: png, eps
OS-SF: png, eps
DATA-MC comparison in the SS-SF and OS-SF samples in the Z+X background control samples for the 2e2mu final states. The distributions correspond to 12.2fb−1 of 8 TeV data. Only DATA are used for the final estimate.
eps,png Distribution of the four-lepton reconstructed mass of Z + em events for 2012 data (dots), compared to the expectation from Z plus two fake leptons as predicted by the Z1+2 SS method (green histogram), from ZZ events (blue histogram), from WZ and ttZ production (yellow histogram), and from Higgs production (orange histogram). This represents a closure test of this method to estimate the reducible background.
pdf,png Invariant mass distribution of events in the control region 2 Prompt +2 Fakes leptons (2P+2F) for the sum of the 4e, 4μ, and 2e2μ channels. The distributions are fitted with the Landau function. The distributions correspond to 12.2 fb−1 of 8 TeV data.
pdf,png, eps Distribution of the four-lepton reconstructed mass in [50-110] GeV mass range (2 GeV bin) for the sum of the 4e, 4μ, and 2e2μ channels applying a relaxed selection to illustrate the single resonance Z->4l peak. Points represent the data, shaded histograms represent the background. The distributions are presented as stacked histograms. The measurements are presented for the sum of the data collected at √s = 7 TeV and √s = 8 TeV.

Leptons

Figure Label Description
png,eps Relative difference between the dimuon mass scales in data and simulation extracted from J/psi, Upsilon and Z decays, as function of the average muon pT for the 2011 data. Markers for different pT bins are slightly displaced horizontally for legibility purposes. The uncertainties shown are statistical only.
png,eps Relative difference between the dimuon mass scales in data and simulation extracted from J/psi, Upsilon and Z decays, as function of the average muon pT for the 2012 data. Markers for different pT bins are slightly displaced horizontally for legibility purposes. The uncertainties shown are statistical only.
png,eps Relative difference between the dimuon mass scales in data and simulation extracted from J/psi, Upsilon and Z decays, as function of the average muon eta for the 2011 data. Markers for different eta bins are slightly displaced horizontally for legibility purposes. The uncertainties shown are statistical only.
png,eps Relative difference between the dimuon mass scales in data and simulation extracted from J/psi, Upsilon and Z decays, as function of the average muon pT for the 2012 data. Markers for different eta bins are slightly displaced horizontally for legibility purposes. The uncertainties shown are statistical only.
png,eps Relative difference between the dimuon mass resolution in data and simulation extracted from J/psi, Upsilon and Z decays, as function of the average muon pT for the 2011 data. Markers for different pT bins are slightly displaced horizontally for legibility purposes. The uncertainties shown are statistical only.
png,eps Relative difference between the dimuon mass resolution in data and simulation extracted from J/psi, Upsilon and Z decays, as function of the average muon pT for the 2012 data. Markers for different pT bins are slightly displaced horizontally for legibility purposes. The uncertainties shown are statistical only.
png,eps Relative difference between the dimuon mass resolution in data and simulation extracted from J/psi, Upsilon and Z decays, as function of the average muon eta for the 2011 data. Markers for different eta bins are slightly displaced horizontally for legibility purposes. The uncertainties shown are statistical only.
png,eps Relative difference between the dimuon mass scales in data and simulation extracted from J/psi, Upsilon and Z decays, as function of the average muon pT for the 2012 data. Markers for different eta bins are slightly displaced horizontally for legibility purposes. The uncertainties shown are statistical only.
png,eps Electron combined reco and selection (Identification, Isolation, Impact Parmater) efficiencies computed with the tag and probe method as a function of the probe pT in the 0. < abs(eta) < 0.8 bin, for data (black) and MC simulation (blueshaded histogram). Errors on plot are from statistical+systematics sources.
png,eps Electron combined reco and selection (Identification, Isolation, Impact Parmater) efficiencies computed with the tag and probe method as a function of the probe pT in the 1.566 < abd(eta) < 2. bin, for data (black) and MC simulation (blueshaded histogram). Errors on plot are from statistical+systematics sources.
barrel: png, eps
Zmumu: png, eps
Electron isolation efficiency computed with the tag and probe method as a function of the number of primary vertices for data (blue) and MC simulation (red shaded histogram) for electrons with pT>20 GeV in ECAL barrel or endcaps.
Zee: png, eps
Zmumu: png, eps
Tag-and-probe results for the muon reconstruction and identification efficiency in data (black dots) compared to simulation (blue shaded histograms). Given that a tracker track exists, the plot show the efficiency as a function of the muon pT in the barrel or endcaps. The measurements is made using J/psi->mu+mu- events for pT<15 GeV and Z->mu+mu- events for pT>15GeV. The uncertainties on the fitted efficiency is determined from the likelihood function. As normalizations of signal and background, efficiency of the background, and parameters controlling the shapes of the signal and background are all parameters of the fit, the uncertainty includes, in addition to the statistical contribition, those from the background subtraction procedure.
Zee: png, eps
Zmumu: png, eps
Tag-and-probe results for the muon isolation efficiency in data (black dots) compared to simulation (blue shaded histograms). Given an identified muon, the plot show the efficiency as a function of the muon pT in the barre or endcapsl. The measurements is made using J/psi->mu+mu- events for pT<15 GeV and Z->mu+mu- events for pT>15GeV. The uncertainties on the fitted efficiency is determined from the likelihood function. As normalizations of signal and background, efficiency of the background, and parameters controlling the shapes of the signal and background are all parameters of the fit, the uncertainty includes, in addition to the statistical contribition, those from the background subtraction procedure.
Best: png, eps
Worst: png, eps
Z to electrons events, electrons are either all ECAL barrel and non-showering ("best category") or all ECAL endcaps and showering ("worst category"). Blue points are 2012 data (12.2 fb-1) with a fit superimposed (blue line). Open circles is MC with a fit superimposed (red line). Fit was done with a convolution of the Breit-Wigner and Crystal Ball functions. The central value and width of the Breit-Wigner function are fixed to PDG values. The Crystal Ball parameters are free in the fit.
DATA: png, eps
MC: png, eps
The ecal-track momentum combination is tested at low pt by looking at J/Psi->ee events in a sample enriched in heavy flavour decays. Both electrons pass the identification criteria of the analysis apart from the isolation and impact parameter. Data is compared to MC simulation from QCD b-enriched samples.
7TeV: png, eps
8TeV: png, eps
Relative difference between the di-electron mass scale in data and simulation extracted from Z decays, as function of the average electron pT. Results are shown for two different methods (template and parametric fit) for 2011 and 2012 data separately. For 2012, the j/psi->ee results are also displayed.
png,eps Differences between 2012 data and MC of the peak position, divided by the peak position in MC, for different classes of electrons either in the ECAL barrel (EB) or ECAL endcaps (EE). G1 = non-showering electrons, G2 = showering electrons.
png,eps Differences between 2012 data and MC of the width, divided by the width in MC, for different classes of electrons, either in the ECAL barrel (EB) or ECAL endcaps (EE). G1 = non-showering electrons, G2 = showering electrons.
png,eps As a function of the number of vertices, differences between 2012 data and MC of the peak position, divided by the peak position in MC.

Signal performances

Figure Label Description
png,eps Mean measurement efficiency for the Higgs boson signal within the geometrical acceptance. The efficiency determined for the signal selection is obtained using Monte Carlo signal samples, and plotted as a function of the Higgs boson mass hypothesis mH separately for the 4e, 4mu, and 2e2mu channels. Comparison with signal efficiencies obtained for the ICHEP'12 analysis is also shown as dashed lines.
png,eps Mean measurement efficiency for the Higgs boson signal within the geometrical acceptance. The efficiency determined for the signal selection is obtained using Monte Carlo signal samples, and plotted as a function of the Higgs boson mass hypothesis mH separately for the 4e, 4mu, and 2e2mu channels (ZOOM version of the above plot). Comparison with signal efficiencies obtained for the ICHEP'12 analysis is also shown as dashed lines.
png,eps Distribution of the transverse momentum (pT) for each of the four leptons (ordered in pT) from H to 4l signal events and for a mass hypothesis of mH = 125. The distributions are obtained using MC signal samples and shown at generator level within eta acceptance (empty histograms), and for selected events (shaded histograms) in the 4e channel
png,eps Distribution of the transverse momentum (pT) for each of the four leptons (ordered in pT) from H to 4l signal events and for a mass hypothesis of mH = 125. The distributions are obtained using MC signal samples and shown at generator level within eta acceptance (empty histograms), and for selected events (shaded histograms) in the 2e2mu channel.
png,eps Distribution of the transverse momentum (pT) for each of the four leptons (ordered in pT) from H to 4l signal events and for a mass hypothesis of mH = 125. The distributions are obtained using MC signal samples and shown at generator level within eta acceptance (empty histograms), and for selected events (shaded histograms) in the 4mu channel.
png,eps Distribution of the transverse momentum (pT) for each of the four leptons (ordered in pT) from H to 4l signal events and for a mass hypothesis of mH = 126. The distributions are obtained using MC signal samples and shown at generator level within eta acceptance (empty histograms), and for selected events (shaded histograms) in the 4e channel
png,eps Distribution of the transverse momentum (pT) for each of the four leptons (ordered in pT) from H to 4l signal events and for a mass hypothesis of mH = 126. The distributions are obtained using MC signal samples and shown at generator level within eta acceptance (empty histograms), and for selected events (shaded histograms) in the 2e2mu channel.
png,eps Distribution of the transverse momentum (pT) for each of the four leptons (ordered in pT) from H to 4l signal events and for a mass hypothesis of mH = 126. The distributions are obtained using MC signal samples and shown at generator level within eta acceptance (empty histograms), and for selected events (shaded histograms) in the 4mu channel.

P-values (4l only)

Figure Label Description
eps,png Observed p-values for a standard model Higgs boson, with mass in the range [110-180] GeV, decaying via ZZ to 4e, 4μ, 2e2μ, 2e2τ. Dashed line represents the expected p-value for a standard model Higgs boson at the corresponding mass.
eps,png Observed p-values for a standard model Higgs boson, with mass in the range [110-1000] GeV, decaying via ZZ to 4e, 4μ, 2e2μ, 2e2τ. Dashed line represents the expected p-value for a standard model Higgs boson at the corresponding mass.
eps,png Observed p-values for a standard model Higgs boson decaying via ZZ to 4e, 4μ, or 2e2μ in the range [110-180] GeV. Dashed line represents the expected p-value for a standard model Higgs boson at the corresponding mass. The blue lines represent √s = 7TeV, the red lines represent √s = 8TeV and the black lines represent the combination of the two.
eps,png Observed p-values for a standard model Higgs boson decaying via ZZ to 4e, 4μ, or 2e2μ in the range [110-1000] GeV. Dashed line represents the expected p-value for a standard model Higgs boson at the corresponding mass. The blue lines represent √s = 7TeV, the red lines represent √s = 8TeV and the black lines represent the combination of the two.
eps,png Observed p-values for a standard model Higgs boson, with mass in the range [110-180] GeV, decaying via ZZ to 4e, 4μ, or 2e2μ. Dashed line represents the expected p-value for a standard model Higgs boson at the corresponding mass. The blue lines represent a 1D fit of the four lepton mass distribution, while the black lines represent a 2D fit of the four lepton mass distribution and a kinematic discriminant (KD).
eps,png Observed p-values for a standard model Higgs boson, with mass in the range [110-1000] GeV, decaying via ZZ to 4e, 4μ, or 2e2μ. Dashed line represents the expected p-value for a standard model Higgs boson at the corresponding mass. The blue lines represent a 1D fit of the four lepton mass distribution, while the black lines represent a 2D fit of the four lepton mass distribution and a kinematic discriminant (KD).
eps,png Observed p-values for a standard model Higgs boson, with mass in the range [110-140] GeV, decaying via ZZ to 4e, 4μ, or 2e2μ. Dashed line represents the expected p-value for a standard model Higgs boson at the corresponding mass. The red lines represent a 1D fit of the four lepton mass distribution, the blue lines represent a 2D fit of the four lepton mass distribution and event by event errors, and the black lines represent a 2D fit of the four lepton mass distribution and a kinematic discriminant (KD).

Upper Limits (4l only)

Figure Label Description
eps,png Expected and observed 95% confidence level limits for a standard model Higgs boson, with mass in the range [110-1000] GeV, decaying via ZZ to 4e, 4μ, or 2e2&#956. The green band represents the expected limit ± one standard deviation and the yellow band represents the expected limit ± two standard deviations band.
eps,png Expected and observed 95% confidence level limits for a standard model Higgs boson, with mass in the range [110-180] GeV, decaying via ZZ to 4e, 4μ, or 2e2&#956. The green band represents the expected limit ± one standard deviation and the yellow band represents the expected limit ± two standard deviations band.
pdf,png,eps, The mean expected and the observed upper limits at 95% C.L. on σ(pp → H + X) B(ZZ → 4l) for a Higgs boson in the mass range 110-180 GeV/c2, for an integrated luminosity of 5.1 fb−1 at 7 TeV. The cross section of σ(pp → H + X) B(ZZ → 4l) at 7 TeV is also shown.
pdf,png,eps, The mean expected and the observed upper limits at 95% C.L. on σ(pp → H + X) B(ZZ → 4l) for a Higgs boson in the mass range 110-1000 GeV/c2, for an integrated luminosity of 5.1 fb−1 at 7 TeV. The cross section of σ(pp → H + X) B(ZZ → 4l) at 7 TeV is also shown.
pdf,png,eps, The mean expected and the observed upper limits at 95% C.L. on σ(pp → H + X) B(ZZ → 4l) for a Higgs boson in the mass range 110-180 GeV/c2, for an integrated luminosity of 12.2 fb−1 at 8 TeV. The cross section of σ(pp → H + X) B(ZZ → 4l) at 8 TeV is also shown.
pdf,png,eps, The mean expected and the observed upper limits at 95% C.L. on σ(pp → H + X) B(ZZ → 4l) for a Higgs boson in the mass range 110-1000 GeV/c2, for an integrated luminosity of 12.2 fb−1 at 8 TeV. The cross section of σ(pp → H + X) B(ZZ → 4l) at 8 TeV is also shown.

P-Values (4l+2l2tau)

Figure Label Description
eps,png Observed p-values for a standard model Higgs boson, with mass in the range [110-1000] GeV, decaying via ZZ to 4e, 4μ, 2e2μ, 2e2τ, or 2μ2τ. Dashed line represents the expected p-value for a standard model Higgs boson at the corresponding mass.

Upper Limits (4l+2l2tau)

Figure Label Description
eps,png Expected and observed 95% confidence level limits for a standard model Higgs boson, with mass in the range [110-1000] GeV, decaying via ZZ to 4e, 4μ, 2e2μ, 2e2τ, or 2μ2τ. The green band represents the expected limit ± one standard deviation and the yellow band represents the expected limit ± two standard deviations band.

J^CP

Figure Label Description
png eps The separation between the 0+ and 0- signal hypotheses observed in the data. The separation is obtained with a 2D statistical analysis in the plane (superMELA, pseudoMELA). The two hatched histograms show the distributions of the log-likelihood ratio between the two signal models for 50k toy experiments tossed according to the 0+ and 0- hypothesis. The observation in the data is shown by the green arrow. The mass of the boson assumed for the test was M_H=126 GeV.
png Scan of 2 times the log-likelikood ratio between the two signal models as a function of mu, the signal strength modifier, and f_{a3}, the fraction of observed 0- events in the dataset. The latter is related to the ratio of the squared amplitudes of the 0+ and 0- states that could simultaneously contribute to the observed state, in a BSM scenario. The SM predicts f_{a3} to be basically equal to zero. The mass of the boson assumed for the test was M_H=126 GeV.
png eps Distribution of D_{bkg} (super-MELA) for events in the mass range 106<m_{4l}<141 GeV. The shaded histograms show background expectation, the open histograms show signal expectation, and points show observed data.
png Distribution of D_{0-}, pseudo-MELA, for events in the mass range 106<m_{4l}<141 GeV and D_{bkg}>.5. The shaded histograms show background expectation, the open histograms show signal expectation, and points how observed data.
png eps The separation between the 0+ and 2+ signal hypotheses observed in the data. The separation is obtained with a 2D statistical analysis in the plane (superMELA, graviMELA). The two hatched histograms show the distributions of the log-likelihood ratio between the two signal models for 50k toy experiments tossed according to the 0+ and 2+ hypothesis. The observation in the data is shown by the green arrow. The mass of the boson assumed for the test was M_H=126 GeV.
png eps Observed distribution of DGS (JP = 2+ versus JP = 0+) compared with the expectation. Points represent the observed data, shaded histograms represent the background, and the open histogram the signal expectation for a 126 GeV SM Higgs boson.

Mass measurement

Figure Label Description
png eps 3D test statistics –2 ln Q vs hypothesized Higgs boson mass mH and signal strength σ/σSM The cross indicates the best-fit values. The solid and dashed contours show the 68% and 95% CL ranges, respectively. In this combination, the relative signal strengths for the various final states are constrained by the expectations for the SM Higgs boson.
png pdf 1D test statistics q(mH) scan vs hypothesized Higgs boson mass mH, obtained from the 3D test statistics profiling the minimum of the signal strengths, with and without systematics.
png pdf 1D test statistics q(mH) scan vs hypothesized Higgs boson mass mH, obtained from the 1D, 2D, and 3D tests statistics profiling the minimum of the signal strengths.

Cross-check results obtained with the alternative kinematic discriminant (KD)

The following cross-check results are obtained with the alternative kinematic discriminant based on the complete leading order matrix elements calculated using the public MEKD framework. The kinematic discriminant separating two hypotheses A and B for production of a given four-lepton event is defined as KD(A;B) = ln( |ME(A)|2 ⁄ |ME(B)|2 ), where ME(A) and ME(B) stand for the matrix elements associated with processes A and B, respectively. For separation of the pseudo-scalar and SM Higgs-like scalar hypotheses, events in the approximately ±2σ mass windows around mH = 126 GeV are used.

Figure Label Description
eps,pdf,png The 2D temperature-scale plot shows the expected distribution of events in the plane of four-lepton reconstructed mass m4l and the alternative kinematic discriminant KD(H;ZZ) for simulated ZZ background events in the low-mass range [100-170] GeV. The z-axis shows the relative fraction of events normalised to the bin width. The observed events for 7 and 8 TeV are shown with open and closed symbols, respectively, with horizontal bars representing the individual event mass measurement uncertainties.

eps,pdf,png The 2D temperature-scale plot shows the expected distribution of events in the plane of four-lepton reconstructed mass m4l and the alternative kinematic discriminant KD(H;ZZ) for simulated Higgs boson signal (mH = 126 GeV) in the low-mass range [100-170] GeV. The z-axis shows the relative fraction of events normalised to the bin width. The observed events for 7 and 8 TeV are shown with open and closed symbols, respectively, with horizontal bars representing the individual event mass measurement uncertainties.

eps,png,pdf The 2D temperature-scale plot shows the conditional probability distribution pdf(KD | m4l) for the backgrounds in the low-mass [100-170] GeV. The observed events for 7 and 8 TeV are shown with open and closed symbols, respectively, with horizontal bars representing the individual event mass measurement uncertainties.

eps,pdf,png The 2D temperature-scale plot shows the conditional probability distribution pdf(KD | m4l) for the SM Higgs boson with mH=m4l in the low-mass [100-170] GeV. The observed events for 7 and 8 TeV are shown with open and closed symbols, respectively, with horizontal bars representing the individual event mass measurement uncertainties.

eps,pdf,png Expected and observed p-values for a standard model Higgs boson, with mass in the range [115-165] GeV, decaying via ZZ to 4e, 4μ, 2e2μ. Each dashed/solid line represents the expected/obserevd p-value for a standard model Higgs boson at the corresponding mass. Red lines show the baseline analysis results. Black lines correspond to the results obtained with the alternative kinematic discriminant. The expected significance at the mass 126.2 GeV is found to be 5.14σ / 5.25σ for the baseline/alternative kinematic discriminants. The maximal observed significance is 4.5σ / 4.34σ for the baseline/alternative kinematic discriminants.

Figure Label Description
png,eps,pdf The 2D temperature-scale plot shows the probability density function pdf(x,y; ZZ), where x and y are the alternative kinematic discriminants KD(H;ZZ) and KD(0-;ZZ). The pdf(x,y; ZZ) is obtained using simulated ZZ background events in the approximately ±2σ mass windows around mH = 126 GeV. The observed events in the same mass windows for 7 and 8 TeV are shown with open and closed symbols, respectively.

png,eps,pdf The 2D temperature-scale plot shows the probability density function pdf(x,y; H), where x and y are the alternative kinematic discriminants KD(H;ZZ) and KD(0-;ZZ). The pdf(x,y; H) is obtained using simulated SM Higgs boson events in the approximately ±2σ mass windows around mH = 126 GeV. The observed events in the same mass windows for 7 and 8 TeV are shown with open and closed symbols, respectively.

png,eps,pdf The 2D temperature-scale plot shows the probability density function pdf(x,y; 0−), where x and y are the alternative kinematic discriminants KD(H;ZZ) and KD(0-;ZZ). The pdf(x,y; 0−) is obtained using simulated pseudo-scalar signal events in the approximately ±2σ mass windows around mH = 126 GeV. The observed events in the same mass windows for 7 and 8 TeV are shown with open and closed symbols, respectively.

png,eps,pdf The expected distributions for the test statistic built for distinguishing between the SM Higgs boson (0+) and pseudo-scalar (0) signal hypotheses, using 2D-templates shown above. The observed test statistic values are shown by a green vertical bar. The expected separation for the boson with mH = 126 GeV is 1.9σ. The hypothesis of 100% pure 0 is disfavoured with respect to the SM Higgs boson hypothesis with CLs value equal to 0.034.

2l 2tau plots :

Mass Plots

Figure Label Description
png,pdf The four-lepton reconstructed mass summed for all $\taus$ final states. The data corresponds to an integrated luminosity of 5.0 \fbinv at 7 TeV and 12.21 \fbinv at 8 TeV. The backgrounds are presented as stacked histograms. The background shapes are taken from MC simulation and normalized to the values obtained using the data-driven techniques described in the text. The expected mass distributions for the SM Higgs boson with a mass 350 GeV are also shown for comparison.
png,pdf Note : Only X Axis range is different, choose one. The four-lepton reconstructed mass summed for all $\taus$ final states. The data corresponds to an integrated luminosity of 5.0 \fbinv at 7 TeV and 12.21 \fbinv at 8 TeV. The backgrounds are presented as stacked histograms. The background shapes are taken from MC simulation and normalized to the values obtained using the data-driven techniques described in the text. The expected mass distributions for the SM Higgs boson with a mass 350 GeV are also shown for comparison.

Z1 vs Z2 Mass plot

Figure Label Description
png,pdf Distribution of the Z2 reconstructed mass versus the Z1 reconstructed mass of the four-lepton candidates in full mass range for the the all 2l2tau channels. Black points represent the data events selected at √s = 8 TeV, and Red square represent the data events selected at √s = 7 TeV.

Limit Plot

Figure Label Description
png,pdf The expected and observed 95\% CL upper limits on the product of the production cross section and decay branching ratio for a Higgs boson normalized to the SM expectation as a function of $m_{\rm H}$, using data corresponding to integrated luminosity of 5.0 \fbinv at 7 TeV and 12.21 \fbinv at 8 TeV.

Cut Flow Plots

Figure Label Description
png,pdf Cut Flow data-to-MC comparison for eett final state using data collected at √s = 8 TeV.
png,pdf Cut Flow data-to-MC comparison for mmtt final state using data collected at √s = 8 TeV.

Background Control Region plots

Figure Label Description
png,pdf Data to MC comparison in the same sign control region for eett final state at √s = 8 TeV.
png,pdf Data to MC comparison in the same sign control region for mmtt final state at √s = 8 TeV

Topic attachments
I Attachment History Action Size Date Who Comment
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Unknown file formateps fr_electron_2012_Zee.eps r1 manage 10.3 K 2012-11-11 - 23:25 ChristopheOchando  
PNGpng fr_electron_2012_Zee.png r1 manage 62.4 K 2012-11-11 - 23:25 ChristopheOchando  
Unknown file formateps fr_electron_2012_Zmumu.eps r1 manage 10.4 K 2012-11-11 - 23:25 ChristopheOchando  
PNGpng fr_electron_2012_Zmumu.png r1 manage 61.8 K 2012-11-11 - 23:25 ChristopheOchando  
Unknown file formateps fr_muon_2012_Zee.eps r1 manage 10.6 K 2012-11-11 - 23:25 ChristopheOchando  
PNGpng fr_muon_2012_Zee.png r1 manage 61.8 K 2012-11-11 - 23:25 ChristopheOchando  
Unknown file formateps fr_muon_2012_Zmumu.eps r1 manage 10.8 K 2012-11-11 - 23:25 ChristopheOchando  
PNGpng fr_muon_2012_Zmumu.png r1 manage 62.3 K 2012-11-11 - 23:25 ChristopheOchando  
Unknown file formateps graviMELAproj_superMELA_p5.eps r2 r1 manage 24.1 K 2012-11-30 - 13:45 AlexeyDrozdetskiy spin 2
PNGpng graviMELAproj_superMELA_p5.png r2 r1 manage 57.7 K 2012-11-30 - 13:56 AlexeyDrozdetskiy spin 2
Unknown file formateps ll_zz4l_mela3D.eps r1 manage 139.6 K 2012-11-12 - 15:38 RobertoSalerno  
PNGpng ll_zz4l_mela3D.png r1 manage 18.6 K 2012-11-12 - 15:38 RobertoSalerno  
PDFpdf mH_2LLR_scan_2Dvs3Dvs1D.pdf r1 manage 16.3 K 2012-11-12 - 15:38 RobertoSalerno  
PNGpng mH_2LLR_scan_2Dvs3Dvs1D.png r1 manage 17.8 K 2012-11-12 - 15:38 RobertoSalerno  
PDFpdf mH_2LLR_scan_3D_wo_syst.pdf r1 manage 14.9 K 2012-11-12 - 15:38 RobertoSalerno  
PNGpng mH_2LLR_scan_3D_wo_syst.png r1 manage 15.0 K 2012-11-12 - 15:38 RobertoSalerno  
PDFpdf mZ1vsm4l.pdf r1 manage 211.3 K 2012-11-12 - 16:14 RobertoSalerno  
PNGpng mZ1vsm4l.png r1 manage 68.3 K 2012-11-12 - 16:14 RobertoSalerno  
PDFpdf mZ2vsm4l.pdf r1 manage 211.3 K 2012-11-12 - 16:14 RobertoSalerno  
PNGpng mZ2vsm4l.png r1 manage 69.4 K 2012-11-12 - 16:14 RobertoSalerno  
PDFpdf mZ2vsmZ1.pdf r1 manage 211.3 K 2012-11-12 - 16:14 RobertoSalerno  
PNGpng mZ2vsmZ1.png r1 manage 64.2 K 2012-11-12 - 16:14 RobertoSalerno  
Unknown file formateps mela2D_HCPPAS_background_highmass.eps r1 manage 186.1 K 2012-11-11 - 15:27 ChristopheOchando  
PNGpng mela2D_HCPPAS_background_highmass.png r1 manage 19.8 K 2012-11-11 - 15:27 ChristopheOchando  
Unknown file formateps mela2D_HCPPAS_background_lowmass.eps r1 manage 38.0 K 2012-11-11 - 15:27 ChristopheOchando  
PNGpng mela2D_HCPPAS_background_lowmass.png r1 manage 18.2 K 2012-11-11 - 15:27 ChristopheOchando  
Unknown file formateps mela2D_HCPPAS_signal126_lowmass.eps r1 manage 38.2 K 2012-11-11 - 15:27 ChristopheOchando  
PNGpng mela2D_HCPPAS_signal126_lowmass.png r1 manage 17.7 K 2012-11-11 - 15:27 ChristopheOchando  
PDFpdf mmttVector.pdf r1 manage 15.2 K 2012-11-09 - 16:25 RamanKhurana  
PNGpng mmttVector.png r1 manage 14.4 K 2012-11-09 - 16:25 RamanKhurana  
Unknown file formateps modelIndependence_MELA.eps r1 manage 15.0 K 2012-11-12 - 01:52 AndrewWhitbeck  
PNGpng modelIndependence_MELA.png r1 manage 16.9 K 2012-11-12 - 01:52 AndrewWhitbeck  
Unknown file formateps pseudoMELAproj_superMELA_p5.eps r4 r3 r2 r1 manage 24.1 K 2012-11-13 - 03:07 AndrewWhitbeck  
PNGpng pseudoMELAproj_superMELA_p5.png r4 r3 r2 r1 manage 12.0 K 2012-11-13 - 03:07 AndrewWhitbeck  
Unknown file formateps pteff_2e2mu_125_091112_.eps r1 manage 19.0 K 2012-11-11 - 15:09 ChristopheOchando  
PNGpng pteff_2e2mu_125_091112_.png r1 manage 23.8 K 2012-11-11 - 15:09 ChristopheOchando  
Unknown file formateps pteff_2e2mu_126_091112_.eps r1 manage 20.2 K 2012-11-11 - 15:09 ChristopheOchando  
PNGpng pteff_2e2mu_126_091112_.png r1 manage 23.8 K 2012-11-11 - 15:09 ChristopheOchando  
Unknown file formateps pteff_4e_125_091112_.eps r1 manage 19.2 K 2012-11-11 - 15:09 ChristopheOchando  
PNGpng pteff_4e_125_091112_.png r1 manage 23.4 K 2012-11-11 - 15:09 ChristopheOchando  
Unknown file formateps pteff_4e_126_091112_.eps r1 manage 19.9 K 2012-11-11 - 15:10 ChristopheOchando  
PNGpng pteff_4e_126_091112_.png r1 manage 23.9 K 2012-11-11 - 15:10 ChristopheOchando  
Unknown file formateps pteff_4mu_125_091112_.eps r1 manage 19.6 K 2012-11-11 - 15:10 ChristopheOchando  
PNGpng pteff_4mu_125_091112_.png r1 manage 23.8 K 2012-11-11 - 15:10 ChristopheOchando  
Unknown file formateps pteff_4mu_126_091112_.eps r1 manage 20.4 K 2012-11-11 - 15:10 ChristopheOchando  
PNGpng pteff_4mu_126_091112_.png r1 manage 24.2 K 2012-11-11 - 15:10 ChristopheOchando  
Unknown file formateps pvalue_comparison.eps r1 manage 17.3 K 2012-11-12 - 17:18 RobertoSalerno  
PNGpng pvalue_comparison.png r1 manage 143.7 K 2012-11-12 - 17:18 RobertoSalerno  
Unknown file formateps pvalues_hzz4l_hzz2l2t.eps r1 manage 16.6 K 2012-11-12 - 15:18 AustinBelknap hzz4l and hzz2l2t combination p-values
PNGpng pvalues_hzz4l_hzz2l2t.png r1 manage 22.2 K 2012-11-12 - 15:18 AustinBelknap hzz4l and hzz2l2t combination p-values
Unknown file formateps sigsep_combine_GRAVvsSMH_50k_unblinded_V2.eps r1 manage 12.1 K 2012-11-30 - 13:45 AlexeyDrozdetskiy spin 2
PNGpng sigsep_combine_GRAVvsSMH_50k_unblinded_V2.png r1 manage 61.0 K 2012-11-30 - 13:56 AlexeyDrozdetskiy spin 2
Unknown file formateps sigsep_combine_scan2D_contour.eps r1 manage 150.4 K 2012-11-12 - 22:50 AndrewWhitbeck  
PNGpng sigsep_combine_scan2D_contour.png r1 manage 62.4 K 2012-11-12 - 22:50 AndrewWhitbeck  
Unknown file formateps sigsep_combine_wObs.eps r1 manage 12.0 K 2012-11-12 - 19:55 AndrewWhitbeck  
PNGpng sigsep_combine_wObs.png r1 manage 12.1 K 2012-11-12 - 19:55 AndrewWhitbeck  
Unknown file formateps superMELAproj.eps r4 r3 r2 r1 manage 21.6 K 2012-11-13 - 03:07 AndrewWhitbeck  
PNGpng superMELAproj.png r4 r3 r2 r1 manage 12.5 K 2012-11-13 - 03:07 AndrewWhitbeck  
Unknown file formateps template2D_H_data.eps r1 manage 51.0 K 2013-01-15 - 11:52 AlexeyDrozdetskiy  
PDFpdf template2D_H_data.pdf r1 manage 25.7 K 2013-01-15 - 11:52 AlexeyDrozdetskiy  
PNGpng template2D_H_data.png r1 manage 29.0 K 2013-01-15 - 11:52 AlexeyDrozdetskiy  
Unknown file formateps template2D_ZZ_data.eps r1 manage 52.1 K 2013-01-15 - 11:53 AlexeyDrozdetskiy MEKD
PDFpdf template2D_ZZ_data.pdf r1 manage 25.9 K 2013-01-15 - 11:53 AlexeyDrozdetskiy MEKD
PNGpng template2D_ZZ_data.png r1 manage 27.8 K 2013-01-15 - 11:53 AlexeyDrozdetskiy MEKD
Unknown file formateps template2D_bkg_data.eps r1 manage 51.8 K 2013-01-15 - 11:53 AlexeyDrozdetskiy MEKD
PDFpdf template2D_bkg_data.pdf r1 manage 25.9 K 2013-01-15 - 11:53 AlexeyDrozdetskiy MEKD
PNGpng template2D_bkg_data.png r1 manage 27.0 K 2013-01-15 - 11:53 AlexeyDrozdetskiy MEKD
Unknown file formateps template2D_mH126_data.eps r1 manage 46.4 K 2013-01-15 - 11:53 AlexeyDrozdetskiy MEKD
PDFpdf template2D_mH126_data.pdf r1 manage 24.6 K 2013-01-15 - 11:53 AlexeyDrozdetskiy MEKD
PNGpng template2D_mH126_data.png r1 manage 25.6 K 2013-01-15 - 11:53 AlexeyDrozdetskiy MEKD
Unknown file formateps upperLimit_hzz4l_hzz2l2t.eps r1 manage 25.6 K 2012-11-12 - 11:34 AustinBelknap hzz4l and hzz2l2t combination limit
PDFpdf upperLimit_hzz4l_hzz2l2t.pdf r1 manage 30.1 K 2012-11-12 - 11:31 AustinBelknap hzz4l and hzz2l2t combination limit
PNGpng upperLimit_hzz4l_hzz2l2t.png r1 manage 33.7 K 2012-11-12 - 11:31 AustinBelknap hzz4l and hzz2l2t combination limit
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Topic revision: r45 - 2013-02-04 - RobertoSalerno
 
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