Higgs Pair Production as a Signal of Enhanced Yukawa Couplings

Abstract

We present a non-trivial correlation between the enhancement of the Higgs-fermion couplings and the Higgs pair production cross section in two Higgs doublet models with a flavour symmetry. This symmetry suppresses flavour-changing neutral couplings of the Higgs boson and allows for a partial explanation of the hierarchy in the Yukawa sector. After taking into account the constraints from electroweak precision measurements, Higgs coupling strength measurements, and unitarity and perturbativity bounds, we identify an interesting region of parameter space leading to enhanced Yukawa couplings as well as enhanced di-Higgs gluon fusion production at the LHC reach. This effect is visible in both the resonant and non-resonant contributions to the Higgs pair production cross section. We encourage dedicated searches based on differential distributions as a novel way to indirectly probe enhanced Higgs couplings to light fermions.

5 pages including 2 figures, (minor corrections, matches journal version)

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Cited by in corpus (11)

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• Disentangling new physics effects on non-resonant Higgs boson pair production from gluon fusion
• Multi-Higgs Boson Production with Anomalous Interactions at Current and Future Proton Colliders
• Prospects of non-resonant di-Higgs searches and Higgs boson self-coupling measurement at the HE-LHC using machine learning techniques
• Multi-Higgs Production Probes Higgs Flavor
• Multi Higgs Boson Signals of a Modified Muon Yukawa Coupling at a Muon Collider
• Probing Flavor Non-Universal Theories Through Higgs Physics at the LHC and Future Colliders
• Prospects for exotic $h\to 4\tau$ decays in single and di-Higgs boson production at the LHC and future hadron colliders
• Theory Vision talk at LHCP2018