Are There Hidden Scalars in LHC Higgs Results?

Abstract

The Higgs boson recently discovered at the Large Hadron Collider has shown to have couplings to the remaining particles well within what is predicted by the Standard Model. The search for other new heavy scalar states has so far revealed to be fruitless, imposing constraints on the existence of new scalar particles. However, it is still possible that any existing heavy scalars would preferentially decay to final states involving the light Higgs boson thus evading the current LHC bounds on heavy scalar states. Moreover, decays of the heavy scalars could increase the number of light Higgs bosons being produced. Since the number of light Higgs bosons decaying to Standard Model particles is within the predicted range, this could mean that part of the light Higgs bosons could have their origin in heavy scalar decays. This situation would occur if the light Higgs couplings to Standard Model particles were reduced by a concomitant amount. Using a very simple extension of the SM - the two-Higgs double model - we show that in fact we could already be observing the effect of the heavy scalar states even if all results related to the Higgs are in excellent agreement with the Standard Model predictions.

15 pages, 9 figures. V2: off-shell decays considered, minor changes to comply with referee. V3: replaced plot for correct version

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Cited by in corpus (19)

• Scrutinizing the Alignment Limit in Two-Higgs-Doublet Models. Part 1: $m_h=125$ GeV
• Scrutinizing the Alignment Limit in Two-Higgs-Doublet Models. Part 2: $m_H=125$ GeV
• Probing wrong-sign Yukawa couplings at the LHC and a future linear collider
• Singlet Extensions of the Standard Model at LHC Run 2: Benchmarks and Comparison with the NMSSM
• Constraints on and future prospects for Two-Higgs-Doublet Models in light of the LHC Higgs signal
• Benchmarks for Higgs Pair Production and Heavy Higgs Searches in the Two-Higgs-Doublet Model of Type II
• Wrong sign and symmetric limits and non-decoupling in 2HDMs
• The role of leptons in electroweak baryogenesis
• 2HDM Higgs-to-Higgs Decays at Next-to-Leading Order
• Signs of Composite Higgs Pair Production at Next-to-Leading Order
• Top-phobic heavy Higgs boson as the 750 GeV diphoton resonance
• Decoupling Theoretical Uncertainties from Measurements of the Higgs Boson
• Constraints on 3-3-1 models with electroweak Z pole observables and Z' search at LHC
• An Exceptional G(2) Extension of the Standard Model from the Correspondence with Cayley-Dickson Algebras Automorphism Groups
• Source terms for electroweak baryogenesis in the vev-insertion approximation beyond leading order
• Gigantic diphoton rate of heavy Higgs bosons in the aligned two Higgs doublet models with small $\tan \beta$
• Constraints on Two Higgs Doublet Model Parameters in the light of rare $B$-Decays
• Discovery prospects of a light Higgs boson at the LHC in type-I 2HDM
• A different perspective on the vev insertion approximation for electroweak baryogenesis