Evidence for a new state 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

A search for the Higgs boson in the H → ZZ four-lepton decay channel, with each Z boson decaying to an electron, a muon, or a tau pair, is reported. The search covers Higgs boson mass hypotheses in the range 110 < mH < 600 GeV. The analysis uses pp collision data recorded by the CMS detector at the LHC, corresponding to integrated luminosities of 5.05 fb-1 at s = 7 TeV and 5.26 fb-1 at s = 8 TeV. The four-lepton invariant-mass distributions for m4l and m2l2t are found to be consistent with the standard model expectations for background ZZ production for invariant masses above 180 GeV. Upper limits at 95% confidence level exclude the standard model Higgs boson in the range 131–162 and 172–525 GeV, while the expected exclusion range is 121–570 GeV. An excess of events is observed in the low m4l mass range, making the observed limits weaker than expected in the absence of a signal. These events cluster around a mass m4l 125.5 GeV, giving rise to a local excess with respect to the background expectation, with a significance of 3.2 sigma. This result constitutes evidence for a new massive state.

Mass plots

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 [70-800] GeV mass range (10 GeV bin) for the sum of the 4e, 4μ, and 2e2μ channels. Points represent the data and shaded histograms represent the background 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 [70-800] 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. Data points are removed from the blind regions between [110-140] GeV and above 300 GeV that are shaded appropriately.
	eps,png	Distribution of the four-lepton reconstructed mass in [70-600] 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 [70-600] GeV mass range (10 GeV bin) for the sum of the 4e, 4μ, and 2e2μ channels. Points represent the data and shaded histograms represent the background 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 [70-600] 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. Data points are removed from the blind regions between [110-140] GeV and above 300 GeV that are shaded appropriately.
	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 [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. 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. 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. Data points are removed from the blind region between [110-140] GeV that is shaded appropriately.
	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. Also shown are the central values and individual candidate mass measurement uncertainties.
	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.
	pdf,png	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 5.26 \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.

Additional distributions

Figure	Label	Description
	eps,png	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	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	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.
	eps,png	Distribution of the MELA discriminant of the four-lepton candidates with mass > 180 GeV 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	Errors on the M_{4l} measurement versus the M_{4l} in the data for the 4e (green), 4mu (red) and 2e2mu (blue). The measurements are presented for the sum of the data collected at √s = 7 TeV (full circles) and √s = 8 TeV (empty circles).

Additional distributions with MELA KD > 0.5

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 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	Distribution of the four-lepton reconstructed mass in [70-180] 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	Distribution of the Z1 reconstructed mass for the sum of the 4e, 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	Distribution of the Z2 reconstructed mass for the sum of the 4e, 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.

Additional distributions with 121 GeV < m4l < 131 GeV

Figure	Label	Description
	eps,png	Distribution of the MELA discriminant of the four-lepton candidates in [121-131] 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 MELA discriminant of the four-lepton candidates in [121-131] GeV mass range for the sum of the 4e, 4μ, and 2e2μ channels. Points represent the data, shaded histograms represent the background and 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 [121-131] 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 [121-131] 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 Z2 reconstructed mass versus the Z1 reconstructed mass of the four-lepton candidates in [121-131] 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.

MELA KD vs. m4l

Figure	Label	Description
	pdf,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.
	pdf,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.
	pdf,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 signal expectation (mH = 125 GeV).
	eps,png	Distribution of the MELA KD versus the four-lepton reconstructed mass m4l in the low-mass range [100-180] GeV. 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 contours represent the signal expectation (mH = 125 GeV).

MELA KD

Figure	Label	Description
	eps,png	Distribution of the MELA KD in the four-lepton reconstructed mass range [121-131] GeV. The points representing the individual events. The histograms represent the signal and background expectations.
	eps,png	Distribution of M1 in the four-lepton reconstructed mass range [121-131] GeV. The points representing the individual events. The histograms represent the signal and background expectations.
	eps,png	Distribution of M2 in the four-lepton reconstructed mass range [121-131] GeV. The points representing the individual events. The histograms represent the signal and background expectations.
	eps,png	Distribution of costheta1 in the four-lepton reconstructed mass range [121-131] GeV. The points representing the individual events. The histograms represent the signal and background expectations.
	eps,png	Distribution of costheta2 in the four-lepton reconstructed mass range [121-131] GeV. The points representing the individual events. The histograms represent the signal and background expectations.
	eps,png	Distribution of costhetastar in the four-lepton reconstructed mass range [121-131] GeV. The points representing the individual events. The histograms represent the signal and background expectations.
	eps,png	Distribution of phi1 in the four-lepton reconstructed mass range [121-131] GeV. The points representing the individual events. The histograms represent the signal and background expectations.
	eps,png	Distribution of phi in the four-lepton reconstructed mass range [121-131] GeV. The points representing the individual events. The histograms represent the signal and background expectations.
	eps,png	Distribution of the MELA KD. The histograms represent the signal and background expectations.
	eps,png	Distribution of M1. The histograms represent the signal and background expectations.
	eps,png	Distribution of M2. The histograms represent the signal and background expectations.
	eps,png	Distribution of costheta1. The histograms represent the signal and background expectations.
	eps,png	Distribution of costheta2. The histograms represent the signal and background expectations.
	eps,png	Distribution of costhetastar. The histograms represent the signal and background expectations.
	eps,png	Distribution of phi1. The histograms represent the signal and background expectations.
	eps,png	Distribution of phi. The histograms represent the signal and background expectations.
	eps,pdf,png	The distribution of MELA is shown for irreducible background (hashed blue), and three types of singals: the Standard Model Higgs in red, a pseudo scalar in green, and a minimal coupling graviton in purple. All signal models were generated with a mass of 125 GeV.

Background Control

Figure	Label	Description
	png,eps	Probability for reconstructed electron to pass identification and isolation requirements (electron fake ratios), as measured in the Z(ll) + e_reco sample in data.
	png,eps	Probability for a reconstructed moun to pass identification and isolation requirements (muon fake ratios), as measured in the Z(ll) + μ_reco sample in data.
	png,eps	Invariant mass distribution in the control region 3 Prompt+1 Fake leptons (3P+1F) for the sum of 4e, 4μ and 2e2μ channels. Distribution of the 2 Prompt +2 Fakes leptons (2P+2F) reducible background (Z+X, ttbar) is estimated from data and is stacked on top of distribution of the irreducible background taken from simulation (ZZ → 4l). The difference of the sum of these distributions with respect to the distribution of observed events is due to contributions from 3P+1F reducible background processes. This contribution is then properly weighted to estimate the expected 3P+1F events in the signal region.

	eps,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 5.05fb−1 of 7 TeV data.
	eps,png	Results of the prediction method applied in the 4l data sample with the “wrong combination of charge and flavour” (WFC). Figures shows the “closure” test in the signal region for the 7TeV data. The difference between the predicted and the observed number of events in the WFC Signal region is used as a measure of the uncertainty of the prediction.
	eps,png	DATA-MC comparison of the SS-SF samples in the Z+X background control samples for the ZZ in the 4e final states. The distributions correspond to 5fb−1 of 7 TeV data

Background Control for 2l2tau analysis

Figure	Label	Description
	pdf, png	Data to MC comparison in the same sign control region for eett final state at 8 TeV
	pdf, png	Data to MC comparison in the same sign control region for mumutt final state at 8 TeV
	pdf, png	Data to MC comparison for the tau fake rate for the HPS medium isolation working point with 2012 data
	pdf, png	Data to MC comparison for the tau fake rate for the HPS tight isolation working point with 2012 data

Lepton Performance

Figure	Label	Description
	pdf,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 are in the barrel and pass the identification criteria of the analysis apart from the isolation. The average pT of the electrons contributing to the J/Psi peak is 7 GeV.
	pdf,png	Signal efficiency versus background efficiency of the BDT identification (line) and the cut based used in the 2011 analysis (points), for the lepton transverse momentum above 10 GeV (black) and the lepton transverse momentum below 10 GeV (red).
	eps,png	Z to electrons events, non-showering electrons (i.e. golden and big brem) in ECAL barrel. Black points are 2012 data 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.
	eps,png	Z to electrons events, all electrons in ECAL barrel. Black points are 2012 data 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.
	eps,png	Z to electrons events, all electrons in ECAL endcap. Black points are 2012 data 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.
	pdf,png	Electron reconstruction efficiencies computed with the tag and probe method as a function of the SC probe ET in the 0 < eta < 1.4442 bin. Errors on plot are statistical only.
	eps,png,pdf	Electron BDT identification efficiencies computed with the tag and probe method as a function of the probe pT in the 1.566 < eta < 2 bin. Errors on plot are statistical only.
	eps,png,pdf	mll distributions and fits for tags plus passing and failing probes used for the electron identification efficiency measurement in the endcap, 20-30 GeV/c transverse momentum bin.
	eps,png	Tag-and-probe results for the muon reconstruction and identification efficiency in data compared to simulation. Given that a tracker track exists, the plot show the efficiency as a function of the muon pT in the barrel. 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.
	eps,png	Tag-and-probe results for the muon reconstruction and identification efficiency in data compared to simulation. Given that a tracker track exists, the plot show the efficiency as a function of the muon pT in the endcap. 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.
	eps,png	Tag-and-probe results for muon reconstrucion and identification efficiency in data and simulation as a function of muon pseudorapidity. The efficiencies were calculated relative to the tracker tracks with pT > 20 GeV by applying the tag-and-probe technique to Z->mumu events.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.
	eps,png	Tag-and-probe results for the muon reconstruction and identification efficiency in data compared to simulation. Given that a tracker track exists, the plot show the efficiency as a function of the reconstructed number of vertices in the event. 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.
	eps,png	Tag-and-probe results for the particle-flow combined relative isolation efficiency (R_iso < 0.4) in data compared to simulation. Given that an identified muon, the plot show the isolation efficiency as a function of the reconstructed number of vertices in the event. The efficiencies were calculated relative to muons with pT > 20 GeV by applying the tag-and-probe technique to Z->mu+mu- events. 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.
	pdf,png	Simulated distribution of the four-lepton reconstructed mass for a signal mH = 126 GeV for events affected by a Final State Radiation (FSR) photon, before the FSR correction (solid histogram) and after the FSR correction (empty histogram).

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.
	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).
	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 = 120. 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 = 120. 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 = 120. 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-value plots

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, or 2μ2τ . 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 [110-600] 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.
	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.
	eps,png	Observed p-values for a standard model Higgs boson, with mass in the range [110-600] 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.
	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 [110-600] 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 [110-600] 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).

Upper Limits plots

Figure	Label	Description
	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 2e2μ. The dashed blue line represents the expected sensitivity using a 1D four lepton mass fit, while the black line shows the expected sensitivity of using a 2D fit with four lepton mass and a kinematic discriminant (KD).
	eps,png	Expected and observed 95% confidence level limits for a standard model Higgs boson, with mass in the range [110-600] GeV, decaying via ZZ to 4e, 4μ, or 2e2μ. The dashed blue line represents the expected sensitivity using a 1D four lepton mass fit, while the black line shows the expected sensitivity of using a 2D fit with four lepton mass and a kinematic discriminant (KD)
	eps,png	Expected 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 2e2μ. 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 95% confidence level limits for a standard model Higgs boson, with mass in the range [110-600] GeV, decaying via ZZ to 4e, 4μ, or 2e2μ. 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 2e2μ at √s = 7 TeV. 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 [110-600] GeV, decaying via ZZ to 4e, 4μ, or 2e2μ at √s = 7 TeV. 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 2e2μ at √s = 8 TeV. 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 [110-600] GeV, decaying via ZZ to 4e, 4μ, or 2e2μ at √s = 8 TeV. 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 [110-600] GeV, decaying via ZZ to 4e, 4μ, or 2e2μ. 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 2e2μ. 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 [110-600] 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.
	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, 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.
	pdf, png	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 $m_{\rm H}$.

Separation hypotesis

Spin-parity projections below are shown for 5+5, 5+20, and 5+30 fb-1, where the first 5 fb-1 in the "5+5, 5+20, and 5+30" expressions correspond to 7 TeV data taking.

Figure	Label	Description
	eps,png,pdf	Expected separation of J^{P}=0^{+} (purple) and J^{P}=0^{-} (blue) resonances with the current data. Toys are thrown with an expected signal strength equal to that of the Standard Model Higgs boson. The separation significance is 1.6\sigma and roughly corresponds to the number of Gaussian standard deviations between the two peaks.
	eps,png,pdf	Projected separation of J^{P}=0^{+} (purple) and J^{P}=0^{-} (blue) resonances with 20/fb of 8 TeV data. Toys are thrown with an expected signal strength equal to that of the Standard Model Higgs boson. The separation significance is 2.6\sigma and roughly corresponds to the number of Gaussian standard deviations between the two peaks.
	eps,png,pdf	Projected separation of J^{P}=0^{+} (purple) and J^{P}=0^{-} (blue) resonances with 30/fb of 8 TeV data. Toys are thrown with an expected signal strength equal to that of the Standard Model Higgs boson. The separation significance is 3.1\sigma and roughly corresponds to the number of Gaussian standard deviations between the two peaks.

Event Displays

Figure	Label	Description
	png,pdf	Display of a 4e event with four lepton invariant mass of 122.4 GeV.
	png,pdf	Display of a 4e event with four lepton invariant mass of 122.4 GeV.
	png,pdf	Display of a 4μ event with four lepton invariant mass of 125.2 GeV.
	png,pdf	Display of a 4μ event with four lepton invariant mass of 125.2 GeV.
	png,pdf	Display of a 2e2μ event with four lepton invariant mass of 126.9 GeV.
	png,pdf	Display of a 2e2μ event with four lepton invariant mass of 126.9 GeV.
	png,pdf	Display of a 4μ plus recovered FSR photon event .
	png,pdf	Display of a 4μ plus recovered FSR photon event .
	png,pdf	Display of a 4μ plus recovered FSR photon event .
	png,pdf	Display of a 4μ plus recovered FSR photon event .

Event Displays for 2l2tau candidates

Figure	Label	Description
	pdf, png	event display for eeetau event
	pdf, png	event display for a mumutautau event

-- RobertoSalerno - 02-Jul-2012