HIG-12-051

Search for the standard model Higgs boson decaying to tau pairs produced in association with a W or Z boson

This is a condensed description with plots for the analysis CMS-HIG-12-051

Abstract

A search for the standard model Higgs boson decaying to tau pairs is presented using data collected in 2011 and 2012 with the CMS detector at the LHC. The topologies studied represent three or four lepton final states, where the Higgs boson is produced in association with the leptonic decay of a W or Z boson, respectively. The analyses use collision data samples corresponding to integrated luminosities of 5 fb-1 collected at √s = 7 TeV and 12 fb-1 of 8 TeV. Upper limits between 2.7 and 5.5 times the standard model prediction are established on the product of Higgs boson cross section and tau pair decay branching fraction for Higgs masses between 110 and 145 GeV.

Main Results

Setting the upper limit on the production of the standard model Higgs boson in association with W or Z when the Higgs boson decays to a pair of tau leptons

H mass -2 sigma -1 sigma Median +1 sigma +2 sigma Obs. Limit
110 GeV 1.66 2.20 3.05 4.24 5.64 2.72
115 GeV 1.81 2.40 3.33 4.62 6.14 3.07
120 GeV 1.89 2.51 3.48 4.84 6.43 3.64
125 GeV 2.01 2.67 3.70 5.14 6.83 4.68
130 GeV 2.02 2.68 3.72 5.17 6.86 5.04
135 GeV 2.13 2.83 3.92 5.45 7.24 5.24
140 GeV 2.08 2.76 3.83 5.32 7.06 5.46
145 GeV 1.89 2.51 3.48 4.84 6.43 5.05

Tex files with limits:

Tables from CMS-HIG-12-051

Table Label Description
Table 1 pdf, png Number of observed events and expected yields from the different background processes for 3 and 4-lepton channels. The uncertainties represent combination of the statistical and systematic uncertainty.
Table 2 pdf, png Expected and observed 95% CL upper limits on the SM Higgs boson production. Limit is expressed as σ/σSM: the ratio of the excluded production rate times branching fraction to that predicted by the SM.

Figures from CMS-HIG-12-051

Figure Label Description
Figure 1 pdf, png Observed and expected Higgs boson candidate mass spectra in the llτh channel. The expected contribution from the associated production of a SM Higgs boson with mass of 125 GeV is shown by the dashed line. The yields of each process are determined using the same maximum likelihood fit to a signal-plus-background hypothesis used in the limit setting procedure.
Figure 1 pdf, png Observed and expected Higgs boson candidate mass spectra in the llττ channel. The expected contribution from the associated production of a SM Higgs boson with mass of 125 GeV is shown by the dashed line. The yields of each process are determined using the same maximum likelihood fit to a signal-plus-background hypothesis used in the limit setting procedure.
Figure 2 pdf, png Observed and median expected 95% CL upper limits on SM Higgs production set by llτh analysis.
Figure 2 pdf, png Observed 95% CL upper limits on SM Higgs production set by llτh analysis are compared to the median observed limit expected in the presence of a SM Higgs boson, using "signal injection". The observed limit is compared to the distribution of observed limits computed using many signal-injected pseudo-datasets.
Figure 3 pdf, png Observed and median expected 95% CL upper limits on SM Higgs production set by llττ analysis.
Figure 3 pdf, png Observed 95% CL upper limits on SM Higgs production set by llττ analysis are compared to the median observed limit expected in the presence of a SM Higgs boson, using "signal injection". The observed limit is compared to the distribution of observed limits computed using many signal-injected pseudo-datasets.
Figure 4 pdf, png Observed and median expected 95% CL upper limits on SM Higgs production set by the combination of analyses presented in the note.
Figure 4 pdf, png Observed 95% CL upper limits on SM Higgs production set by combination of analyses presented in the note are compared to the median observed limit expected in the presence of a SM Higgs boson, using "signal injection". The observed limit is compared to the distribution of observed limits computed using many signal-injected pseudo-datasets.

Additional plots for public talks

Figure Label Description
Figure 5 pdf, png Hadronic tau fake rate in llττ (ZH analysis) as a function of tau pT for the medium HPS combined isolation with the resulting fit. Results from 2011, 2012 run A and B (April-July) and 2012 C (July-September).
Figure 6 pdf, png Validation of the hadronic tau fake rate method in μμτhτh and eeτhτh final states (ZH analysis). Tau pair is required to have same sign and pass loose isolation with no cut on the scalar sum of their transverse momenta.
Figure 7 pdf, png Observed and expected Higgs boson candidate visible mass spectrum in llττ channel obtained from 7 TeV data. Expected contribution from the SM Higgs boson with mass 125 GeV is shown by the dashed line. The background mass distributions show the results of the maximum likelihood fit using the background-only hypothesis used in the limit setting procedure.
Figure 8 pdf,png Observed and expected Higgs boson candidate visible mass spectrum in llττ channel obtained from 8 TeV data. Expected contribution from the SM Higgs boson with mass 125 GeV is shown by the dashed line. The background mass distributions show the results of the maximum likelihood fit using the background-only hypothesis used in the limit setting procedure.
Figure 9 pdf,png Median expected 95% CL upper limits on SM Higgs production in individual subchannels and their combination.
Figure 10 pdf,png Comparison of observed data with the predicted backgrounds in the eμτh “fake tau”control region in 7 TeV data. The non-prompt background estimate is computed in the same manner as that in the signal region.
Figure 11 pdf,png Comparison of observed data with the predicted backgrounds in the eμτh “fake tau” control region in 8 TeV data. The non-prompt background estimate is computed in the same manner as that in the signal region.
Figure 12 pdf,png Comparison of observed data with the predicted backgrounds in the μμτh “fake tau”control region in 7 TeV data. The non-prompt background estimate is computed in the same manner as that in the signal region.
Figure 13 pdf,png Comparison of observed data with the predicted backgrounds in the μμτh “fake tau” control region in 8 TeV data. The non-prompt background estimate is computed in the same manner as that in the signal region.
Topic attachments
I Attachment History Action Size Date Who Comment
PDFpdf 4l_sm.pdf r2 r1 manage 14.7 K 2012-11-10 - 18:10 EvanFriis  
PNGpng 4l_sm.png r2 r1 manage 141.7 K 2012-11-10 - 18:10 EvanFriis  
PDFpdf 4l_sm_injected.pdf r2 r1 manage 14.7 K 2012-11-10 - 18:10 EvanFriis  
PNGpng 4l_sm_injected.png r2 r1 manage 144.4 K 2012-11-10 - 18:10 EvanFriis  
PDFpdf Fake_fit_Tau_MediumComb.pdf r1 manage 20.4 K 2012-11-07 - 16:10 PavelJez  
PNGpng Fake_fit_Tau_MediumComb.png r1 manage 76.2 K 2012-11-07 - 16:10 PavelJez  
PDFpdf Final_Mass_7TeV.pdf r2 r1 manage 15.0 K 2012-11-12 - 17:49 EvanFriis  
PNGpng Final_Mass_7TeV.png r2 r1 manage 108.9 K 2012-11-12 - 17:49 EvanFriis  
PDFpdf Final_Mass_8TeV.pdf r2 r1 manage 15.6 K 2012-11-12 - 17:49 EvanFriis  
PNGpng Final_Mass_8TeV.png r2 r1 manage 119.8 K 2012-11-12 - 17:49 EvanFriis  
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PDFpdf Validation_ZHtt.pdf r1 manage 14.6 K 2012-11-07 - 16:17 PavelJez  
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PDFpdf cmb_sm.pdf r2 r1 manage 14.6 K 2012-11-07 - 15:34 PavelJez  
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PDFpdf cmb_sm_injected.pdf r2 r1 manage 14.6 K 2012-11-07 - 15:35 PavelJez  
PNGpng cmb_sm_injected.png r2 r1 manage 68.8 K 2012-11-07 - 15:36 PavelJez  
PDFpdf final-f3-qweight05-werror-subMass_emt_7.pdf r1 manage 15.3 K 2012-11-08 - 14:18 PavelJez  
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PDFpdf llt.pdf r2 r1 manage 15.9 K 2012-11-12 - 17:46 EvanFriis  
PNGpng llt.png r3 r2 r1 manage 129.5 K 2012-11-12 - 17:46 EvanFriis  
PDFpdf llt_sm.pdf r2 r1 manage 14.7 K 2012-11-10 - 18:13 EvanFriis  
PNGpng llt_sm.png r2 r1 manage 148.8 K 2012-11-10 - 18:13 EvanFriis  
PDFpdf llt_sm_injected.pdf r2 r1 manage 14.7 K 2012-11-10 - 18:10 EvanFriis  
PNGpng llt_sm_injected.png r2 r1 manage 151.4 K 2012-11-10 - 18:10 EvanFriis  
PDFpdf singleLimits_expected_sm.pdf r1 manage 15.0 K 2012-11-07 - 20:16 PavelJez  
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PDFpdf zh.pdf r2 r1 manage 15.8 K 2012-11-12 - 17:46 EvanFriis  
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