Probing New Physics by the Tail of the Off-shell Higgs in $V_L{V}_L$ Mode

Abstract

Off-shell Higgs at the high mass tail may shed light on the underlying mechanism of the electroweak symmetry breaking. Due to the large cancellation in the standard model (SM) between the box and Higgs-mediated triangle diagrams, the $gg\to WW(ZZ)$ process in the SM is dominated by the $V_T{V}_T$ transverse-mode at the high mass tail. The cancellation does not necessarily hold, when there is a sufficiently large new physics contribution resulting in $V_L{V}_L$ longitudinal mode, which is commonly the case when the Higgs sector is modified. Thus the $V_L{V}_L$ final states in the high mass tail can be utilized as a sensitive probe for such models. In the paper we focus on a study of the $gg\to ZZ$ process in the fully leptonic decay modes, proposing to utilize the polarization modes of the off-shell Higgs to probe new physics, whose contribution mainly shows in the longitudinal mode. As examples, we analyze three different Higgs sector new physics cases (Higgs portal with a light scalar, a broad-width scalar that mixes with the Higgs, and quantum critical Higgs models), and demonstrate that the angular information relating to the polarization serves as very sensitive probe for such new physics.

6 pages, 2 figures, 1 table

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Cited by in corpus (7)

• Evidence of off-shell Higgs boson production from $ZZ$ leptonic decay channels and constraints on its total width with the ATLAS detector
• Discriminating between Higgs Production Mechanisms via Jet Charge at the LHC
• Suppression of Higgs Mixing by Quantum Zeno Effect
• Polarized and unpolarized off-shell $H^{\ast }\to ZZ\to 4\ell$ decay above the $2m_Z$ threshold
• Longitudinally polarized ZZ scattering at the Muon Collider
• On Broad Kaluza-Klein Gluons
• Sensitivity to longitudinal vector boson scattering and doubly-charged Higgs boson production in ${\mathbf{W}}^{\pm }{\mathbf{W}}^{\pm }\mathbf{jj}$ at future hadron colliders