CMS-PAS-HIG-23-007 | ||
Search for anomalous Higgs boson couplings in WH →ℓνbˉb production through Vector Boson Scattering | ||
CMS Collaboration | ||
30 November 2023 | ||
Abstract: A study of the electroweak-induced production of a W boson and a Higgs boson is presented. The data collected by the CMS experiment in 2016-2018 from proton-proton collisions at a centre-of-mass energy of 13 TeV are used, corresponding to an integrated luminosity of 138 fb−1. Selected events target the leptonic decay of the W boson and the decay of the Higgs boson to bˉb. In particular, beyond standard model (BSM) Higgs couplings are considered, such that the Higgs boson decay products are boosted and thus reconstructed as a single large-cone jet. Limits are set on the parameters that scale the Higgs couplings to the W and Z bosons in the κ framework. The BSM scenario where λWZ=κW/κZ=− 1 is excluded at a confidence level (CL) larger than 99.99%, with an expected and observed significance beyond 5σ. The hypotheses where the κW and κZ parameters are compatible with the current measurements and have different signs are similarly excluded at a CL larger than 99.99%. | ||
Links:
CDS record (PDF) ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, Submitted to PLB. The superseded preliminary plots can be found here. |
Figures | |
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Figure 1:
Feynman diagrams for the production of WH →ℓνbˉb via VBS. |
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Figure 1-a:
Feynman diagrams for the production of WH →ℓνbˉb via VBS. |
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Figure 1-b:
Feynman diagrams for the production of WH →ℓνbˉb via VBS. |
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Figure 1-c:
Feynman diagrams for the production of WH →ℓνbˉb via VBS. |
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Figure 2:
Data/MC comparison for the softdrop mass of the AK8 jet selected as Higgs boson candidate, in the regions used in the background estimate. Regions D and A, which both have |Δηjj|> 4, are plotted on the left. Regions C and B, which both have |Δηjj|≤ 4, are plotted on the right. In the signal region, region D, the blue markers show the background yield predicted from data. The small contributions from VH production, tˉt+ X (X = H, W, Z, bˉb, jets), and EW production of a leptonically decaying W are merged into a single category labeled ``Other.'' |
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Figure 2-a:
Data/MC comparison for the softdrop mass of the AK8 jet selected as Higgs boson candidate, in the regions used in the background estimate. Regions D and A, which both have |Δηjj|> 4, are plotted on the left. Regions C and B, which both have |Δηjj|≤ 4, are plotted on the right. In the signal region, region D, the blue markers show the background yield predicted from data. The small contributions from VH production, tˉt+ X (X = H, W, Z, bˉb, jets), and EW production of a leptonically decaying W are merged into a single category labeled ``Other.'' |
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Figure 2-b:
Data/MC comparison for the softdrop mass of the AK8 jet selected as Higgs boson candidate, in the regions used in the background estimate. Regions D and A, which both have |Δηjj|> 4, are plotted on the left. Regions C and B, which both have |Δηjj|≤ 4, are plotted on the right. In the signal region, region D, the blue markers show the background yield predicted from data. The small contributions from VH production, tˉt+ X (X = H, W, Z, bˉb, jets), and EW production of a leptonically decaying W are merged into a single category labeled ``Other.'' |
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Figure 3:
Exclusion significance in the 2D κW-κZ plane. The observed and expected 2σ and 5σ exclusion contours are shown. The 2σ and 5σ contours are given by −2ΔlogL less than 6.18 and 28.7 respectively. The current best limits |κW|= 1.02 ± 0.08 and |κZ|= 1.04 ± 0.07 are also plotted [59]. Opposite-sign κW-κZ (or negative λWZ) scenarios are excluded at an expected and observed significance beyond 5σ. |
Tables | |
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Table 1:
Summary of selections for the signal region. |
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Table 2:
The background yield estimated from data and signal yield predicted by MC simulation in the signal region are tabulated with their associated statistical and pre-fit systematic uncertainties. The systematic uncertainty for signal quoted here is the sum in quadrature of all of the independent systematics multiplied by the total yield. The observed data yield is also tabulated. |
Summary |
In this document, we have reported the first study of electroweak WH production using data recorded with the CMS detector at the LHC. We focused on the BSM scenario where λWZ=κW/κZ=−1 and extended the search to a grid in κW-κZ phase space. In total, 138 fb−1 of data collected between 2016 and 2018 with a center-of-mass energy of 13 TeV were analyzed. Events were selected by requiring exactly one isolated charged lepton, missing transverse momentum, two jets consistent with a vector boson scattering interaction, and an additional large-cone jet consistent with the boosted Higgs boson decay to bˉb. The BSM scenario where λWZ=−1 is excluded at a confidence level (CL) higher than 99.99%, with an expected and observed significance beyond 5σ. Similarly, all the opposite sign scenarios with κW and κZ values compatible with the current measurements are excluded with a CL higher than 99.99%. |
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Compact Muon Solenoid LHC, CERN |
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