h→γγ excess and dark matter from composite Higgs models

Chala, Mikael

doi:10.1007/jhep01(2013)122

Cited by 67 publications

(52 citation statements)

References 83 publications

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“…If the sector responsible for SSB is strong, NGB interactions become strong at high-E. These scenarios are particularly interesting in association with the hierarchy problem [9][10][11][12][13][14][15], but also independently from it [16,17]. Qualitatively different cases of interest can be identified, depending on the particular group structure being considered and the interplay with Higgs physics.…”

Section: Scalar Dark Mattermentioning

confidence: 99%

“…SU(2) → U(1) or larger, symmetry breaking patterns [9,[14][15][16]. Finally, both the Higgs and DM can arise together from a nonfactorizable group G, such as SO(6)/SO(5) [10,11,13,19]. The very power of EFTs is that, at low-E, large groups of theories fall in the same universality classes: in our case the generic EFTs that we will now build to describe the above-mentioned scenarios can be matched to any model with approximate symmetries.…”

Section: Scalar Dark Mattermentioning

confidence: 99%

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Strongly Interacting Light Dark Matter

2017

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We discuss a class of Dark Matter (DM) models that, although inherently strongly coupled, appear weakly coupled at small-energy and fulfill the WIMP miracle, generating a sizable relic abundance through the standard freeze-out mechanism. Such models are based on approximate global symmetries that forbid relevant interactions; fundamental principles, like unitarity, restrict these symmetries to a small class, in such a way that the leading interactions between DM and the Standard Model are captured by effective operators up to dimension-8. The underlying strong coupling implies that these interactions become much larger at high-energy and represent an interesting novel target for LHC missing-energy searches.

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Section: Scalar Dark Mattermentioning

confidence: 99%

Section: Scalar Dark Mattermentioning

confidence: 99%

Strongly Interacting Light Dark Matter

2017

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“…For example, effective operators contributing to these processes are suppressed by at least two powers of the cutoff scale Λ (see appendix A). As a matter of fact, these contact interactions arise naturally in the context, for instance, of non-minimal Composite Higgs Models [98][99][100][101][102]. On the other hand, possibly s−channel contributions are in addition suppressed by small far off-shell propagators; 17 while t−channel contributions are forbidden, since doubly-charged scalars do not have trilinear couplings to a quark pair.…”

Section: Jhep03(2014)027mentioning

confidence: 99%

LHC bounds on lepton number violation mediated by doubly and singly-charged scalars

Águila

Chala

2014

J. High Energ. Phys.

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Abstract:The only possible doubly-charged scalar decays into two Standard Model particles are into pairs of same-sign charged leptons, H ±± → l ± l ± , l = e, µ, τ , or gauge bosons, H ±± → W ± W ± ; being necessary the observation of both to assert the violation of lepton number. However, present ATLAS and CMS limits on doubly-charged scalar production are obtained under specific assumptions on its branching fractions into dileptons only. Although they can be extended to include decays into dibosons and lepton number violating processes. Moreover, the production rates also depend on the type of electroweak multiplet H ±± belongs to. We classify the possible alternatives and provide the Feynman rules and codes for generating the corresponding signals for pair and associated doubly-charged scalar production, including the leading contribution from the s-channel exchange of electroweak gauge bosons as well as the vector-boson fusion corrections. Then, using the same analysis criteria as the LHC collaborations we estimate the limits on the H ±± mass as a function of the electroweak multiplet it belongs to, and obtain the bounds on the lepton number violating processes pp → H ±± H ∓∓ → ± ± W ∓ W ∓ and pp → H ±± H ∓ → ± ± W ∓ Z, = e, µ, implied by the ATLAS and CMS doubly-charged scalar searches.

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“…refs. [15][16][17][18][19][20][21][22][23][24][25][26][27]. In this paper we focus on the possibility that such new states are supersymmetric and study enhanced h → γγ rate in the MSSM.…”

Section: Jhep10(2013)088mentioning

confidence: 99%

Light staus and enhanced Higgs diphoton rate with non-universal gaugino masses and SO(10) Yukawa unification

Badziak

Olechowski

Pokorski

2013

J. High Energ. Phys.

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It is shown that substantially enhanced Higgs to diphoton rate induced by light staus with large left-right mixing in MSSM requires at the GUT scale non-universal gaugino masses with bino and/or wino lighter than gluino. The possibility of such enhancement is investigated in MSSM models with arbitrary gaugino masses at the GUT scale with additional restriction of top-bottom-tau Yukawa unification, as predicted by minimal SO(10) GUTs. Many patterns of gaugino masses leading to enhanced Higgs to diphoton rate and the Yukawa unification are identified. Some of these patterns can be accommodated in a well-motivated scenarios such as mirage mediation or SUSY breaking F -terms being a nonsinglet of SO(10). Phenomenological implications of a scenario with non-universal gaugino masses generated by a mixture of the singlet F -term and the F -term in a 24-dimensional representation of SU(5) ⊂ SO(10) are studied in detail. Possible non-universalities of other soft terms generated by such F-terms are discussed. The enhancement of Higgs to diphoton rate up to 30% can be obtained in agreement with all phenomenological constraints, including vacuum metastability bounds. The lightest sbottom and pseudoscalar Higgs are within easy reach of the 14 TeV LHC. The LSP can be either bino-like or wino-like. The thermal relic abundance in the former case may be in agreement with the cosmological data thanks to efficient stau coannihilation.

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h→γγ excess and dark matter from composite Higgs models

Cited by 67 publications

References 83 publications

Strongly Interacting Light Dark Matter

Strongly Interacting Light Dark Matter

LHC bounds on lepton number violation mediated by doubly and singly-charged scalars

Light staus and enhanced Higgs diphoton rate with non-universal gaugino masses and SO(10) Yukawa unification

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