CMS-PAS-B2G-18-006 | ||
Statistical combination of CMS searches for heavy resonances decaying to a pair of bosons or leptons at √s= 13 TeV | ||
CMS Collaboration | ||
March 2019 | ||
Abstract: The statistical combination of searches for heavy resonances decaying to a pair of bosons or leptons is presented. The data sample corresponds to an integrated luminosity of 35.9 fb−1 collected in 2016 by the CMS experiment at the CERN LHC from proton-proton collisions at a center-of-mass energy of 13 TeV. The data are found to be consistent with background expectations. The exclusion limits set in the context of a spin-1 heavy vector triplet framework and spin-2 Bulk Graviton models are the most stringent to date presented by CMS. In a scenario with mass-degenerate W' and Z' resonances, heavy vector bosons with mass below 4.5 TeV are excluded at a 95% confidence level if the dominant couplings are to the standard model gauge bosons, and 5.0 TeV if the resonances couple predominantly to fermions. | ||
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These preliminary results are superseded in this paper, PLB 798 (2019) 134952. The superseded preliminary plots can be found here. |
Figures | |
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Figure 1:
Observed and expected 95% CL upper limits on the product of the cross section and branching ratio of a spin-1 (left) or spin-2 resonance (right) decaying to a pair of bosons. |
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Figure 1-a:
Observed and expected 95% CL upper limits on the product of the cross section and branching ratio of a spin-1 resonance decaying to a pair of bosons. |
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Figure 1-b:
Observed and expected 95% CL upper limits on the product of the cross section and branching ratio of a spin-2 resonance decaying to a pair of bosons. |
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Figure 2:
Observed and expected 95% CL upper limits on the W' (left) and Z' cross section (right) as a function of the W' and Z' resonance mass. The inner green and outer yellow bands represent the ±1 and ±2 standard deviation variations on the expected limits of the statistical combination of the considered VV and VH channels. The expected limit of the single channels is represented by the colored dashed lines. The solid curves and their shaded areas correspond to the cross section predicted by the HVT models B and the relative uncertainties. |
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Figure 2-a:
Observed and expected 95% CL upper limits on the W' cross section as a function of the W' resonance mass. The inner green and outer yellow bands represent the ±1 and ±2 standard deviation variations on the expected limits of the statistical combination of the considered VV and VH channels. The expected limit of the single channels is represented by the colored dashed lines. The solid curves and their shaded areas correspond to the cross section predicted by the HVT models B and the relative uncertainties. |
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Figure 2-b:
Observed and expected 95% CL upper limits on the Z' cross section as a function of the Z' resonance mass. The inner green and outer yellow bands represent the ±1 and ±2 standard deviation variations on the expected limits of the statistical combination of the considered VV and VH channels. The expected limit of the single channels is represented by the colored dashed lines. The solid curves and their shaded areas correspond to the cross section predicted by the HVT models B and the relative uncertainties. |
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Figure 3:
Observed and expected 95% CL upper limit on the cross section as a function of the HVT triplet mass, for the combination of all the considered channels, in the HVT model B (left) and model A (right). The inner green and outer yellow bands represent the ±1 and ±2 standard deviation variations on the expected limit. The solid curves and their shaded areas correspond to the cross sections predicted by the HVT models A and B and the relative uncertainties. |
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Figure 3-a:
Observed and expected 95% CL upper limit on the cross section as a function of the HVT triplet mass, for the combination of all the considered channels, in the HVT model B. The inner green and outer yellow bands represent the ±1 and ±2 standard deviation variations on the expected limit. The solid curves and their shaded areas correspond to the cross sections predicted by the HVT models A and B and the relative uncertainties. |
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Figure 3-b:
Observed and expected 95% CL upper limit on the cross section as a function of the HVT triplet mass, for the combination of all the considered channels, in the HVT model A. The inner green and outer yellow bands represent the ±1 and ±2 standard deviation variations on the expected limit. The solid curves and their shaded areas correspond to the cross sections predicted by the HVT models A and B and the relative uncertainties. |
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Figure 4:
Observed exclusion limits in the HVT parameter plane [gVcH, g2cF/gV] for three different resonance masses (3.0, 4.0, and 4.5 TeV) of the statistical combination (solid lines) of the dilepton (dotted lines) and diboson channels (dashed lines). The areas bounded by the thin gray contour lines correspond to the regions where the resonance natural width (ΓV′) is predicted to be larger than the average experimental resolution (5%). |
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Figure 5:
Observed and expected 95% CL upper limit on the cross section of the spin-2 Bulk Graviton as a function of its mass for the statistical combination of the WW, ZZ, and HH channels. The inner green and outer yellow bands represent the ±1 and ±2 standard deviation variations on the expected limit. The solid curve and its shaded area represent the cross section derived with the parameter ˜κ= 0.5 and the associated uncertainty. |
Tables | |
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Table 1:
Summary of the main selections that guarantee the orthogonality between analyses. The symbol ℓ represents an electron or a muon; τ leptons are considered separately. The AK4 b jets are additional b tagged AK4 jets that do not geometrically overlap with AK8 jets. |
Summary |
The statistical combination of searches for heavy resonances decaying into a pair of vector bosons, a vector boson and a Higgs boson, two Higgs bosons, or a pair of leptons, has been presented. The searches are performed on the data collected by the CMS experiment at √s= 13 TeV during 2016, and correspond to an integrated luminosity of 35.9 fb−1. In models with warped extra dimensions, upper limits of up to 1.1 fb at 95% CL are set on the production cross section of the spin-2 bulk graviton. For models with a triplet of narrow spin-1 resonances, heavy vector bosons with masses lower than 5.0 and 4.5 TeV are excluded at 95% CL in benchmark scenarios A and B, respectively. |
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Compact Muon Solenoid LHC, CERN |
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