Let there be light from a second light Higgs doublet

Haisch, Ulrich; Malinauskas, Augustinas

doi:10.1007/jhep03(2018)135

Cited by 58 publications

(42 citation statements)

References 60 publications

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“…Other interesting channels are HH + production through an off-shell W boson [17][18][19][20][21] and ZH production through an off-shell A 0 [22]. The couplings of the 125 GeV Higgs boson are constrained to lie close to SM values [23] which means that |s δ | 0.4.…”

Section: Jhep08(2018)025mentioning

confidence: 99%

Light signals from a lighter Higgs

Fox

Weiner

2018

J. High Energ. Phys.

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With the Higgs search program already quite mature, there is the exciting possibility of discovering a new particle with rates near that of the SM Higgs. We consider models with a signal in γγ below the SM Higgs mass. We discuss singlet models with additional vectorlike matter, but argue that a Type-I two Higgs doublet model can more easily provide detectable rates. In such scenarios, in regions of moderate-to-strong fermiophobia, the enhanced γγ branching ratio allows signals from V H+VBF production to yield σ × BR γγ comparable to total SM rates and would thus be detectable. Light H production can be dominated via rare top decays t → bH + → bW * H, which provides an even more efficient means of production. We also consider this in the context of various Higgs anomalies, specifically the recent 2.9 σ (local) CMS excess at 95 GeV, the LEP Higgs excess near the same mass, and excesses in tth searches at Tevatron and LHC. We find regions of parameter space that can meet all simultaneously. An implication of the Type-I scenario is that any γγ excess should be associated with additional elements that could reduce background, including b-jets, forward jets or signs of vector boson production.

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Section: Jhep08(2018)025mentioning

confidence: 99%

Light signals from a lighter Higgs

Fox

Weiner

2018

J. High Energ. Phys.

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“…At a similar mass, CMS observes a 2.9 σ local excess in the diphoton channel, that could come from gg → h 2 → γγ [56][57][58]. These observations have motivated theorists to propose a number of models [59][60][61][62][63][64][65][66][67][68] A necessary ingredient of the pNGB DM model is an additional scalar h 2 that mixes with the SM Higgs, denoted as h 1 . It is possible to take m h2 = 96 GeV while still being consistent with the cosmic ray excesses.…”

Section: Introductionmentioning

confidence: 99%

Pseudo-Goldstone dark matter confronts cosmic ray and collider anomalies

Cline

Toma

2019

Phys. Rev. D

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Persistent excesses in the spectra of gamma rays from the galactic center and cosmic ray antiprotons can be explained by dark matter of mass 50 ∼ 65 GeV annihilating into b quarks, but this is typically hard to reconcile with direct detection constraints. We resolve this tension using a simple class of models, where dark matter is a pseudo-Nambu-Goldstone boson, having naturally momentum-suppressed couplings to nuclei. Exploring the parameter space of the model, we find that it can explain the cosmic ray anomalies while remaining compatible with constraints from the relic abundance and annihilation in dwarf spheroidal galaxies. In certain regions of parameter space, the Higgs-dark matter coupling can help stabilize the Higgs potential up to the Planck scale. The scalar partner of the dark matter is an extra Higgs boson, that can explain a tentative diphoton excess observed by CMS, and an excess of bb signal from LEP, if its mass is ∼ 96 GeV and the model is extended to include a heavy scalar quark. This extended model predicts a monochromatic gamma-ray line near 64 GeV, at a level close to current experimental sensitivity, from dark matter annihilations in the galaxy.

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“…Finally, we examined the recently observed 95 GeV CMS diphoton excess, which has also been explored in various recent studies [40][41][42]. We have shown that for a custodial fiveplet Higgs boson, branching ratios ∼ 10% are needed to explain the excess.…”

Section: Jhep06(2018)137mentioning

confidence: 99%

“…This also opens up the possibility of future LHC diphoton signals from a light exotic Higgs sector. As part of our analysis we briefly explore the recently observed ∼ 3σ diphoton excess by CMS [38] at ∼ 95 GeV, also examined in recent studies [39][40][41][42][43]. Finally, we examine two explicit realizations of these light Higgs sectors in the Georgi-Machacek (GM) and Supersymmetric GM (SGM) models [44] which contain custodial Higgs bosons with small couplings to SM fermions and, in the SGM model, an invisible (neutralino) LSP.…”

Section: Jhep06(2018)137mentioning

confidence: 99%

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Light (and darkness) from a light hidden Higgs

Vega

Vega-Morales

Xie

2018

J. High Energ. Phys.

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We examine light diphoton signals from extended Higgs sectors possessing (approximate) fermiophobia with Standard Model (SM) fermions as well as custodial symmetry. This class of Higgs sectors can be realized in various beyond the SM scenarios and is able to evade many experimental limits, even at light masses, which are otherwise strongly constraining. Below the W W threshold, the most robust probes of the neutral component are di and multi-photon searches. Utilizing the dominant Drell-Yan Higgs pair production mechanism and combining it with updated LHC diphoton data, we derive robust upper bounds on the allowed branching ratio for masses between 45 − 160 GeV. Furthermore, masses 110 GeV are ruled out if the coupling to photons is dominated by W boson loops. We then examine two simple ways to evade these bounds via cancellations between different loop contributions or by introducing decays into an invisible sector. This also opens up the possibility of future LHC diphoton signals from a light hidden Higgs sector. As explicit realizations, we consider the Georgi-Machacek (GM) and Supersymmetric GM (SGM) models which contain custodial (degenerate) Higgs bosons with suppressed couplings to SM fermions and, in the SGM model, a (neutralino) LSP. We also breifly examine the recent ∼ 3σ CMS diphoton excess at ∼ 95 GeV.

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Let there be light from a second light Higgs doublet

Cited by 58 publications

References 60 publications

Light signals from a lighter Higgs

Light signals from a lighter Higgs

Pseudo-Goldstone dark matter confronts cosmic ray and collider anomalies

Light (and darkness) from a light hidden Higgs

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