Abstract
New physics frameworks like the next-to-minimal supersymmetric standard Model and the Next-to-2-Higgs-doublet Model contain three neutral CP-even Higgs bosons. It is possible for the heavier two of these states to have masses identical to each other, which can result in a sizeable quantum interference between their propagators in processes they mediate. For both these models, we study the impact of such interference on the pair-production of the lightest of the three scalars, which we identify with the observed 125 GeV Higgs boson, in the gluon-fusion channel at the large hadron collider (LHC). We find that the inclusion of these effects can substantially alter the cross section, compared to its value when they are ignored, for this process. Our results illustrate the importance of taking possible quantum interference effects into account not only when investigating the phenomenology of extended Higgs sectors at the future Run(s) of the LHC, but also when imposing its current exclusion bounds on the parameter spaces of these models.
Highlights
Pair-production of the Higgs boson state, hobs, discovered in 2012 [1,2] is a key process for measuring the Higgs selfcoupling at the Run 3 of the large hadron collider (LHC), as well as at its approved high-luminosity upgrade (HLLHC)
We investigate the implications of the quantum interference on the gluon-initiated pair-production of √the Standard Model (SM)-like H1 state of the NMSSM at the LHC with s = 14 TeV, and of its non-supersymmetric counterpart, the next-to-2-Higgs Doublet Model (2HDM) (N2HDM)
The latter model is obtained by introducing a real singlet Higgs field into the 2HDM, and while it is phenomenologically similar to the NMSSM, a crucial advantage the N2HDM has is that the physical Higgs boson masses can themselves be the input parameters
Summary
Pair-production of the Higgs boson state, hobs, discovered in 2012 [1,2] is a key process for measuring the Higgs selfcoupling at the Run 3 of the large hadron collider (LHC), as well as at its approved high-luminosity upgrade (HLLHC). We investigate the implications of the quantum interference on the gluon-initiated pair-production of √the SM-like H1 state of the NMSSM at the LHC with s = 14 TeV, and of its non-supersymmetric counterpart, the next-to-2HDM (N2HDM) The latter model is obtained by introducing a real singlet Higgs field into the 2HDM, and while it is phenomenologically similar to the NMSSM, a crucial advantage the N2HDM has is that the physical Higgs boson masses can themselves be the input parameters. This grants us the freedom of setting the H2 and H3 masses exactly equal and assessing the impact of this maximal mass-degeneracy on the said process.
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