Determination of the Relative Sign of the Higgs Boson Couplings to <math display="inline"><mrow><mi>W</mi></mrow></math> and <math display="inline"><mi>Z</mi></math> Bosons Using <math display="inline"><mi>W</mi><mi>H</mi></math> Production via Vector-Boson Fusion with the ATLAS Detector
- Aad, Georges et al
- arXiv:2402.00426CERN-EP-2023-286
 | Examples of leading-order Feynman diagrams for VBF $WH$ production, where the Higgs boson interacts with either a $W$ or $Z$~boson. These diagrams interfere destructively if the Higgs boson couplings to $W$ and $Z$ have the same sign, and constructively if they have opposite sign. |
 | Examples of leading-order Feynman diagrams for VBF $WH$ production, where the Higgs boson interacts with either a $W$ or $Z$~boson. These diagrams interfere destructively if the Higgs boson couplings to $W$ and $Z$ have the same sign, and constructively if they have opposite sign. |
 | Fit results in the ($\kappa_{Z}$, $\kappa_{W}$) plane, using the negative-\lam{} analysis. The results are overlaid with the confidence regions (shown in blue) from a separate fit using a combination of the Higgs boson measurements collected in Ref.~\cite{HIGG-2021-23}. This fit assumes that all Higgs boson couplings besides the ones represented are positive, and that only SM particles contribute to loop processes. Confidence regions are constructed from the log-likelihood ratio $\Lambda_{\text{LR}}=-2\ln(L/L_{\text{max}})$, where $L_{\text{max}}$ is the likelihood for the best-fit point, which is shown as a black dot for the VBF $WH$ analysis or a blue dot for the Higgs combination. The $1\sigma$, $2\sigma$, and $5\sigma$ regions are defined by $\Lambda_{\text{LR}}$ values smaller than 2.30, 6.18, and 28.7, respectively. The SM value is marked with a star, while green triangles mark the points with $\kappa_{Z} = \pm1$, $\kappa_{W} = \mp1$. |