Abstract
Current projections suggest that the LHC will have only limited sensitivity to di-Higgs production in the Standard Model (SM), possibly even after the completion of its high luminosity phase. Multi-Higgs final states play a fundamental role in many extensions of the SM as they are intrinsically sensitive to modifications of the Higgs sector. Therefore, any new observation in multi-Higgs final states could be linked to a range of beyond the SM (BSM) phenomena that are not sufficiently addressed by the SM. Extensions of the Higgs sector typically lead to new phenomenological signatures in multi-Higgs final states that are vastly different from the SM expectation. In this work, we provide a range of signature-driven benchmark points for resonant and non-resonant BSM di-Higgs production that motivate non-SM kinematic correlations and multi-fermion discovery channels. Relying on theoretically well-motivated assumptions, special attention is devoted to the particular case where the presence of new physics will dominantly manifest itself in multi-Higgs final states.
Highlights
The Higgs precision spectroscopy program that ensued after the discovery of the Higgs boson in 2012 [1,2] has assumed a central role in particle physics over the past years
We provide a range of signature-driven benchmark points for resonant and nonresonant beyond the SM (BSM) di-Higgs production that motivate non-Standard Model (SM) kinematic correlations and multifermion discovery channels
One reason why measurements of the Higgs’ couplings and its properties have become the focus of searches for physics beyond the Standard Model (BSM) is the lack of conclusive hints for new interactions in the plethora of BSM searches performed by the ATLAS and CMS experiments
Summary
The Higgs precision spectroscopy program that ensued after the discovery of the Higgs boson in 2012 [1,2] has assumed a central role in particle physics over the past years. Interleaving modifications of single-Higgs physics with theoretically well-motivated UV considerations can turn di-Higgs production into a strong probe of new physics: new kinematic features can appear that motivate new final states and search strategies that are not currently considered, e.g., di-Higgs production can be enhanced or suppressed Such phenomenological modifications become relevant when extrapolations of standard singleHiggs channels do not show a significant departure from their SM expectation in these scenarios. E.g., a strong first-order electroweak phase transition, dark matter constraints, electric dipole measurements and consistency with current Higgs coupling measurements as well as an extrapolation thereof, we discuss the results of a comprehensive scan of the models’ parameter space with a particular emphasis on the relevance of multi-Higgs final states We distill this scan into a number of representative benchmark points of BSM theories that highlight the importance of di-Higgs measurements in the future.
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