Stability of the Higgs sector in a flavor-inspired multi-scale model

Allwicher, Lukas; Isidori, Gino; Thomsen, Anders Eller

doi:10.1007/jhep01(2021)191

Cited by 26 publications

(19 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When considering only these bounds, we cannot exclude that this approximate symmetry arises accidentally in the SMEFT, being the consequence of an overall (flavour anarchic) suppression of d = 6 operators. The accidental lepton flavour conservation could also arise as the consequence of appropriate scale hierarchies, as in the general SM extensions proposed in [72][73][74][75], which provide an interesting explanation for the hierarchies observed in both charged-lepton and quark Yukawa couplings. However, the situation changes if we assume the a µ anomaly is due to NP.…”

Section: Discussionmentioning

confidence: 91%

Flavour alignment of New Physics in light of the (g − 2)μ anomaly

Isidori

Pagès

Wilsch

2022

J. High Energ. Phys.

Self Cite

View full text Add to dashboard Cite

We investigate the flavour alignment conditions that New Physics (NP) models need to satisfy in order to address the (g − 2)μ anomaly and, at the same time, be consistent with the tight bounds from μ → eγ and τ → μγ. We analyse the problem in general terms within the SMEFT, considering the renormalisation group evolution of all the operators involved. We show that semileptonic four-fermion operators, which are likely to generate a sizeable contribution to the (g − 2)μ anomaly, need to be tightly aligned to the lepton Yukawa couplings and the dipole operators in flavour space. While this tuning can be achieved in specific NP constructions, employing particular dynamical assumptions and/or flavour symmetry hypotheses, it is problematic in a wide class of models with broken flavour symmetries, such as those proposed to address both charged- and neutral-current B anomalies. We quantify this tension both in general terms, and in the context of explicit NP constructions.

show abstract

Section: Discussionmentioning

confidence: 91%

Flavour alignment of New Physics in light of the (g − 2)μ anomaly

Isidori

Pagès

Wilsch

2022

J. High Energ. Phys.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The universal SU p2q L weak interactions that we see at low energies could be deconstructed according to flavour at higher energies, before being ultimately re-unified with flavour in the UV, via an Spp6q L symmetry. 11 where SU p2q L,i denotes the usual SU p2q L factor of the SM but acting only on the i th family. Breaking Spp6q L down to this subgroup can be achieved using a scalar field in the antisymmetric 2-index 14, the joint-smallest dimension irrep of Spp6q L after the fundamental.…”

Section: Flavour Deconstruction In the Intermediate Eftmentioning

confidence: 99%

“…Moreover, to generate the mass hierarchies requires a small separation of the two symmetry breaking scales by an order of magnitude or two. Recent work [11] at least suggests that maintaining such a separation of scales, in the context of flavour model building, can be radiatively stable. And, of course, the presence of many heavy scalars that couple to the Higgs would exacerbate the electroweak hierarchy problem -which is essentially an unavoidable problem in models with enlarged symmetries in the UV.…”

Section: Introductionmentioning

confidence: 99%

Electroweak flavour unification

Davighi¹,

Tooby-Smith²

2022

Preprint

View full text Add to dashboard Cite

We propose that the electroweak and flavour quantum numbers of the Standard Model (SM) could be unified at high energies in an SU p4q ˆSpp6q L ˆSpp6q R anomaly-free gauge model. All the SM fermions are packaged into two fundamental fields, Ψ L " p4, 6, 1q and Ψ R " p4, 1, 6q, thereby explaining the origin of three families of fermions. The SM Higgs, being electroweakly charged, necessarily becomes charged also under flavour when embedded in the UV model. It is therefore natural for its vacuum expectation value to couple only to the third family. The other components of the UV Higgs fields are presumed heavy. Extra scalars are needed to break this symmetry down to the SM, which can proceed via 'flavourdeconstructed' gauge groups; for instance, we propose a pattern Spp6q L Ñ ś 3 i"1 SU p2q L,i Ñ SU p2q L for the left-handed factor. When the heavy Higgs components are integrated out, realistic quark Yukawa couplings with in-built hierarchies are naturally generated without any further ingredients, if we assume the various symmetry breaking scalars condense at different scales. The CKM matrix that we compute is not a generic unitary matrix, but it can precisely fit the observed values.

show abstract

“…Other 4321 matter extensions require the presence of fermion singlets (1, 1, 1, 0) that give rise to light Majorana neutrinos through the inverse seesaw mechanism [22,88]. Finally, the 4321 models can be viewed as the low-energy limit of a more fundamental theory, such as the Pati-Salam cube model (PS 3 ) [23] (which can be embedded into a warped 5D construction [88,89]), the twin Pati-Salam model [27] or strongly coupled models with extended hypercolour [26].…”

Section: Jhep11(2021)084mentioning

confidence: 99%

Collider signatures of coannihilating dark matter in light of the B-physics anomalies

Baker

Faroughy

Trifinopoulos

2021

J. High Energ. Phys.

View full text Add to dashboard Cite

Motivated by UV explanations of the B-physics anomalies, we study a dark sector containing a Majorana dark matter candidate and a coloured coannihilation partner, connected to the Standard Model predominantly via a U1 vector leptoquark. A TeV scale U1 leptoquark, which couples mostly to third generation fermions, is the only successful single-mediator description of the B-physics anomalies. After calculating the dark matter relic surface, we focus on the most promising experimental avenue: LHC searches for the coloured coannihilation partner. We find that the coloured partner hadronizes and forms meson-like bound states leading to resonant signatures at colliders reminiscent of the quarkonia decay modes in the Standard Model. By recasting existing dilepton and monojet searches we exclude coannihilation partner masses less than 280 GeV and 400 GeV, respectively. Since other existing collider searches do not significantly probe the parameter space, we propose a new dedicated search strategy for pair production of the coloured partner decaying into bbττ final states and dark matter particles. This search is expected to probe the model up to dark matter masses around 600 GeV with current luminosity.

show abstract

Stability of the Higgs sector in a flavor-inspired multi-scale model

Cited by 26 publications

References 22 publications

Flavour alignment of New Physics in light of the (g − 2)μ anomaly

Flavour alignment of New Physics in light of the (g − 2)μ anomaly

Electroweak flavour unification

Collider signatures of coannihilating dark matter in light of the B-physics anomalies

Contact Info

Product

Resources

About