This is a condensed description with plots for the analysis CMSHIG11033. (Phys. Lett. B 710 (2012) 403425)
The background model is obtained by fitting the observed diphoton mass distributions in each of the five event classes.
The local pvalue quantifies the probability for the background to produce a fluctuation at least as large as observed, and assumes that the relative signal strength between the event classes follows the MC signal model for the standard model Higgs boson. The local pvalue corresponding to the largest upwards fluctuation of the observed limit, at 124 GeV, has been computed to be 9.2x10^{4} (3.1 sigma) in the asymptotic approximation, and 1.5x10^{3}(3.0 sigma) when the calculation uses pseudodata. The combined best fit signal strength, for a SM Higgs boson mass hypothesis of 124 GeV, is 2.1+0.6 times the SM Higgs boson cross section. Since a fluctuation of the background could occur at any point in the mass range there is a lookelsewhere effect. When this is taken into account the probability, under the background only hypothesis, of observing a similar or larger excess in the full analysis mass range (110 < mH < 150 GeV) is 3.9x10^{2}, corresponding to a global significance of 1.8 sigma.
Image  File links  Description 

pdf png a) pdf b) pdf c) pdf d) pdf e) pdf f) pdf 
Figure 1: Background model fit to the mgg distribution for the five event classes, together with a simulated signal (m_{H}=120 GeV). The magnitude of the simulated signal is what would be expected if its cross section were twice the SM expectation. The sum of the event classes together with the sum of the five fits is also shown. The individual graphs (available as separate files) are as follows: a) The sum of the five event classes, b) the dijettagged class, c) both photons in the barrel, R9min > 0.94, d) both photons in the barrel, R9min < 0.94, e) at least one photon in the endcaps, R9min > 0.94, f) at least one photon in the endcaps, R9min < 0.94. 

pdf png  Figure 2a: Exclusion limit on the cross section of a SM Higgs boson decaying into two photons as a function of the boson mass.  
pdf png  Figure 2b: Exclusion limit relative to the SM Higgs boson cross section, where the theoretical uncertainties on the cross section have been included in the limit setting. On popular demand: the observed and expected limit at mH = 125 GeV are 3.14 and 1.43, respectively.  
pdf png  Figure 3: The local pvalue as a function of Higgs boson mass, calculated in the asymptotic approximation. The point at 124 GeV shows the value obtained with a pseudodata ensemble.  
pdf png  Figure 4: The best fit signal strength, in terms of the standard model Higgs boson cross section, for the combined fit to the five classes (vertical line) and for the individual contributing classes (points) for the hypothesis of a SM Higgs boson mass of 124 GeV. The band corresponds to +1 sigma uncertainties on the overall value. The horizontal bars indicate +1 sigma uncertainties on the values for individual classes. 
Image  File links  Description 

pdf png  Fraction of Higgs boson vertices found within 10 mm of their true location, for a Monte Carlo signal sample (m_{H} = 120 GeV), as a function of the Higgs boson transverse momentum. The distribution of the number of interactions per bunch crossing (n_{PU}) in the Monte Carlo is adjusted to be the same as in the data by weighting the events.  
pdf png  Distribution of the number of reconstructed vertices (using the deterministic annealing algorithm) for events with a Z decaying to 2 muons in the data (points) and MC after having applied the reweighting on the number of simulated intime pileup events (filled histogram). The distributions are shown for 2 running periods: 2011A  up until late August, during which time the average instantaneous luminosity and consequent pileup was lower, and the time after that, 2001B, when the instantaneous luminosity was higher.  
pdf png  
pdf png  Diphoton mass distribution for data (data points), and Monte Carlo simulation of SM processes which constitute the background to the search (histograms). A simulated signal for a Higgs boson with a mass of 120 GeV is shown by the red outline histogram. The magnitude of the signal is what would be expected if its cross section were 10 times the SM expectation.The shaded band represents the theoretical (kfactor) uncertainty on the the MC prediction. Note that in the analysis the background is evaluated from a fit to the data without reference to the MC simulation. 
Image  File links  Description 

pdf png  Invariant mass distribution of electron pairs from Z boson decay: where (top) both electrons are in the central barrel and have R9>0.94, and (below) where both electrons have R9>0.94, but one electron is in the central barrel and and the other is in the endcap. The red histogram is Monte Carlo, and the black empty histogram is the same Monte Carlo but after smearing of the energies to match the data.  
pdf png 
Image  File links  Description 

pdf png  Photon selection efficiency for m_{H}=120 GeV as a function of as a function of p_{T}, for each of the four photon categories.  
pdf png  Photon selection efficiency for m_{H}=120 GeV as a function of as a function of pseudorapidity, for each of the four photon categories.  
pdf png  Efficiency x Acceptance as a function of mass for selected photons (all event classes combined). The band indicates 1 sigma systematic error. 
png  3D display of event 625786854 in run 177201. A dijettagged event with diphoton mass 121.9 GeV, dijet mass 1460 GeV, photon transverse momenta 193.9 and 78.0 GeV, and jet transverse energies 288.8 and 189.1 GeV. The photon pseudorapidities are 0.405 and 0.037, and the jet pseudorapidities are 2.022 and 1.860. 
I  Attachment  History  Action  Size  Date  Who  Comment 

BestFit.pdf  r1  manage  31.2 K  20120209  17:26  ChrisSeez  
png  BestFit.png  r1  manage  25.0 K  20120209  17:25  ChrisSeez  
BkgFit.pdf  r1  manage  157.2 K  20120209  17:25  ChrisSeez  
png  BkgFit.png  r1  manage  65.0 K  20120209  17:24  ChrisSeez  
Hgg_vtxIdEfficiencyMVA_vs_bosonPt_Run2011.pdf  r1  manage  17.4 K  20120210  08:54  ChrisSeez  
png  Hgg_vtxIdEfficiencyMVA_vs_bosonPt_Run2011.png  r1  manage  107.4 K  20120210  08:55  ChrisSeez  
Limit_GL_combXSxBR.pdf  r1  manage  23.7 K  20120209  17:25  ChrisSeez  
png  Limit_GL_combXSxBR.png  r1  manage  76.8 K  20120209  17:24  ChrisSeez  
Limit_GL_fullCLs.pdf  r1  manage  22.1 K  20120209  17:25  ChrisSeez  
png  Limit_GL_fullCLs.png  r1  manage  57.8 K  20120209  17:24  ChrisSeez  
Limit_GL_pvalue.pdf  r1  manage  18.2 K  20120209  17:26  ChrisSeez  
png  Limit_GL_pvalue.png  r1  manage  56.1 K  20120209  17:24  ChrisSeez  
MD_vtx_2011A.pdf  r1  manage  25.9 K  20120210  08:56  ChrisSeez  
png  MD_vtx_2011A.png  r1  manage  34.0 K  20120210  08:56  ChrisSeez  
MD_vtx_2011B.pdf  r1  manage  25.2 K  20120210  08:56  ChrisSeez  
png  MD_vtx_2011B.png  r1  manage  32.9 K  20120210  08:56  ChrisSeez  
Table1.pdf  r1  manage  60.1 K  20120218  13:43  ChrisSeez  
png  Table1.png  r1  manage  58.8 K  20120218  13:44  ChrisSeez  
Table15.pdf  r1  manage  42.7 K  20120218  13:45  ChrisSeez  
png  Table15.png  r1  manage  43.4 K  20120218  13:45  ChrisSeez  
Table2.pdf  r1  manage  77.2 K  20120218  13:44  ChrisSeez  
png  Table2.png  r1  manage  72.1 K  20120218  13:44  ChrisSeez  
Table3.pdf  r1  manage  199.9 K  20120218  13:44  ChrisSeez  
png  Table3.png  r1  manage  200.4 K  20120218  13:45  ChrisSeez  
effAcc_vs_mass.pdf  r1  manage  14.4 K  20120210  09:03  ChrisSeez  
png  effAcc_vs_mass.png  r1  manage  81.1 K  20120210  09:03  ChrisSeez  
eff_eta.pdf  r1  manage  19.5 K  20120210  09:05  ChrisSeez  
png  eff_eta.png  r1  manage  107.2 K  20120210  09:05  ChrisSeez  
eff_pt.pdf  r1  manage  22.4 K  20120210  09:05  ChrisSeez  
png  eff_pt.png  r1  manage  131.4 K  20120210  09:05  ChrisSeez  
mass.pdf  r1  manage  25.8 K  20120210  08:55  ChrisSeez  
png  mass.png  r1  manage  32.8 K  20120210  08:55  ChrisSeez  
outabs_eta_R9_EBHistos9999_region_0_0.pdf  r1  manage  14.1 K  20120210  08:56  ChrisSeez  
png  outabs_eta_R9_EBHistos9999_region_0_0.png  r1  manage  16.6 K  20120210  08:57  ChrisSeez  
outabs_eta_R9_EEHistos9999_region_0_3.pdf  r1  manage  14.3 K  20120210  08:57  ChrisSeez  
png  outabs_eta_R9_EEHistos9999_region_0_3.png  r1  manage  16.7 K  20120210  08:57  ChrisSeez  
plot0.pdf  r1  manage  36.4 K  20120218  14:42  ChrisSeez  
plot1.pdf  r1  manage  37.0 K  20120218  14:41  ChrisSeez  
plot2.pdf  r1  manage  36.9 K  20120218  14:42  ChrisSeez  
plot3.pdf  r1  manage  36.3 K  20120218  14:42  ChrisSeez  
plot4.pdf  r1  manage  31.0 K  20120218  14:41  ChrisSeez  
plot_all.pdf  r1  manage  37.9 K  20120218  14:41  ChrisSeez  
png  run177201event625786854.png  r1  manage  326.6 K  20120218  10:32  ChrisSeez 