Search for Doubly Charged Higgs

This is the condensed description with plots for the analysis HIG-12-005.

Abstract

A search for the doubly charged Higgs boson in pp collisions at √s = 7 TeV is presented. The data correspond to an integrated luminosity of 4.63 fb−1 collected by the CMS experiment at the LHC. The doubly charged Higgs is a member of SU(2)L scalar triplet Φ in extensions of the Standard Model which include the seesaw mechanism of type II. The search is inclusive and is performed in events with three or more isolated charged leptons of all flavors originating from the decays of pair produced triplet components Φ++Φ−− and Φ++Φ−. No signal is observed and new lower limits at the 95% confidence level are set on the Φ mass, under specific assumption on the Φ++ branching fraction. An upper bound of 457 GeV in the μμ channel, of 455 GeV in eμ channel, of 445 GeV in the ee channel, of 369 GeV in the μτ channel, of 352 GeV in the eτ channel, of 198 GeV in the ττ channel and between 380 GeV and 410 GeV in four chosen benchmark points is set for the type-II see-saw model.

Main results

No significant excess is observed so new world limits are set in ten model specific assumptions of branching ratios. The limits are:
Model assumption Combined limit on all production mechanisms Limit on pair-production only
BR(Φ++ -> e+e+) = 100% 445 GeV 387 GeV
BR(Φ++ -> e+μ+) = 100% 455 GeV 389 GeV
BR(Φ++ -> e+τ+) = 100% 352 GeV 300 GeV
BR(Φ++ -> μ+μ+) = 100% 457 GeV 391 GeV
BR(Φ++ -> μ+τ+) = 100% 369 GeV 313 GeV
BR(Φ++ -> τ+τ+) = 100% 198 GeV 165 GeV
Benchmark point 1 (Normal hierarchy) 380 GeV 326 GeV
Benchmark point 2 (Inverse hierarchy) 410 GeV 361 GeV
Benchmark point 3 (Degenerate masses) 406 GeV 350 GeV
Benchmark point 4 (Equal branching ratios) 399 GeV 353 GeV

Figures from HIG-12-005

Figure Label Description
Figure 1a: pdf png Feynman diagram of associated production.
Figure 1b: pdf png Feynman diagram of pair production.
Figure 2: pdf png Cross sections of both pair and associated production processes.
Figure 3a: pdf png Invariant mass distribution from three lepton final state for backgrounds and data. We also show the expected contribution of a Φ++ with a mass of 350 GeV for the benchmark point BP4. The plot is after pre-selection.
Figure 3b: pdf png Cut flow for three lepton final state for backgrounds and data. We also show the expected contribution of a Φ++ with a mass of 350 GeV for the benchmark point BP4.
Figure 4a: pdf png Invariant mass distribution from four lepton final state for backgrounds and data. We also show the expected contribution of a Φ++ with a mass of 350 GeV for the benchmark point BP4. The plot is after pre-selection.
Figure 4b: pdf png Cut flow for four lepton final state for backgrounds and data. We also show the expected contribution of a Φ++ with a mass of 350 GeV for the benchmark point BP4.
Figure 5: pdf png Summary plot of results.
Figure 6: pdf png Observed Φ++ mass limits at 95% C.L. for 100% branching fraction to ee channel.
Figure 7: pdf png Observed Φ++ mass limits at 95% C.L. for 100% branching fraction to eμ channel.
Figure 8: pdf png Observed Φ++ mass limits at 95% C.L. for 100% branching fraction to eτ channel.
Figure 9: pdf png Observed Φ++ mass limits at 95% C.L. for 100% branching fraction to μμ channel.
Figure 10: pdf png Observed Φ++ mass limits at 95% C.L. for 100% branching fraction to μτ channel.
Figure 11: pdf png Observed Φ++ mass limits at 95% C.L. for 100% branching fraction to ττ channel.
Figure 12: pdf png Observed Φ++ mass limits at 95% C.L. for benchmark point BP1.
Figure 13: pdf png Observed Φ++ mass limits at 95% C.L. for benchmark point BP2.
Figure 14: pdf png Observed Φ++ mass limits at 95% C.L. for benchmark point BP3.
Figure 15: pdf png Observed Φ++ mass limits at 95% C.L. for benchmark point BP4.
Topic attachments
I Attachment History Action Size Date Who Comment
PDFpdf BP4-3l.pdf r1 manage 197.4 K 2012-02-29 - 13:33 MarioKadastik  
PNGpng BP4-3l.png r1 manage 42.9 K 2012-02-29 - 13:34 MarioKadastik  
PDFpdf BP4-4l.pdf r1 manage 195.4 K 2012-02-29 - 13:34 MarioKadastik  
PNGpng BP4-4l.png r1 manage 37.9 K 2012-02-29 - 13:34 MarioKadastik  
PDFpdf BP4-cutflow-3l.pdf r1 manage 194.7 K 2012-02-29 - 13:34 MarioKadastik  
PNGpng BP4-cutflow-3l.png r1 manage 37.2 K 2012-02-29 - 13:35 MarioKadastik  
PDFpdf BP4-cutflow-4l.pdf r1 manage 193.8 K 2012-02-29 - 13:35 MarioKadastik  
PNGpng BP4-cutflow-4l.png r1 manage 30.4 K 2012-02-29 - 13:35 MarioKadastik  
PDFpdf cross_section.pdf r1 manage 120.8 K 2012-02-29 - 13:32 MarioKadastik  
PNGpng cross_section.png r1 manage 116.7 K 2012-02-29 - 13:32 MarioKadastik  
PDFpdf limit-BP1.pdf r3 r2 r1 manage 175.2 K 2012-02-29 - 17:18 MarioKadastik  
PNGpng limit-BP1.png r3 r2 r1 manage 160.1 K 2012-02-29 - 17:20 MarioKadastik  
PDFpdf limit-BP2.pdf r3 r2 r1 manage 175.3 K 2012-02-29 - 17:18 MarioKadastik  
PNGpng limit-BP2.png r3 r2 r1 manage 158.6 K 2012-02-29 - 17:20 MarioKadastik  
PDFpdf limit-BP3.pdf r3 r2 r1 manage 175.2 K 2012-02-29 - 17:19 MarioKadastik  
PNGpng limit-BP3.png r3 r2 r1 manage 157.5 K 2012-02-29 - 17:21 MarioKadastik  
PDFpdf limit-BP4.pdf r3 r2 r1 manage 175.2 K 2012-02-29 - 17:19 MarioKadastik  
PNGpng limit-BP4.png r3 r2 r1 manage 159.5 K 2012-02-29 - 17:21 MarioKadastik  
PDFpdf limit-eeee.pdf r3 r2 r1 manage 175.3 K 2012-02-29 - 17:19 MarioKadastik  
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PDFpdf limit-emem.pdf r3 r2 r1 manage 175.4 K 2012-02-29 - 17:19 MarioKadastik  
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PDFpdf limit-etet.pdf r3 r2 r1 manage 175.2 K 2012-02-29 - 17:19 MarioKadastik  
PNGpng limit-etet.png r3 r2 r1 manage 161.4 K 2012-02-29 - 17:21 MarioKadastik  
PDFpdf limit-mmmm.pdf r3 r2 r1 manage 223.3 K 2012-02-29 - 17:20 MarioKadastik  
PNGpng limit-mmmm.png r3 r2 r1 manage 171.9 K 2012-02-29 - 17:22 MarioKadastik  
PDFpdf limit-mtmt.pdf r3 r2 r1 manage 175.5 K 2012-02-29 - 17:20 MarioKadastik  
PNGpng limit-mtmt.png r3 r2 r1 manage 166.0 K 2012-02-29 - 17:22 MarioKadastik  
PDFpdf limit-tttt.pdf r3 r2 r1 manage 173.4 K 2012-02-29 - 17:20 MarioKadastik  
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PDFpdf production_associated.pdf r1 manage 14.2 K 2012-02-29 - 13:31 MarioKadastik  
PNGpng production_associated.png r1 manage 48.9 K 2012-02-29 - 13:30 MarioKadastik  
PDFpdf production_pair.pdf r1 manage 14.2 K 2012-02-29 - 13:31 MarioKadastik  
PNGpng production_pair.png r1 manage 48.5 K 2012-02-29 - 13:29 MarioKadastik  
PDFpdf punchline.pdf r1 manage 217.2 K 2012-02-29 - 13:35 MarioKadastik  
PNGpng punchline.png r1 manage 68.3 K 2012-02-29 - 13:36 MarioKadastik  
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Topic revision: r3 - 2012-03-11 - ChristophPaus
 
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