Constraints on the Lee-Wick Higgs sector

Carone, Christopher D.; Primulando, Reinard

doi:10.1103/physrevd.80.055020

Cited by 39 publications

(60 citation statements)

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“…In retrospect, the bounds on charged scalar masses in the N = 2 theory obtained by Ref. [14] from BB mixing and b → sγ now lead to weaker constraints (m h 2 > 463 GeV) than that from δg bb L , and the former bounds moreover would also likely be significantly softened by the addition of an N = 3 charged scalar due to the cancellations described above. When both LW quarks and charged scalars are included, the bounds again become more constrained, but many interesting scenarios remain possible; for example, Fig.…”

Section: Constraints From the Zb Lbl Couplingmentioning

confidence: 99%

“…As pointed out in Ref. [14], however, the heavy h ± 2 can be much lighter ( 500 GeV) and still satisfy all precision constraints. Noting first from Eq.…”

Section: Constraints From the Zb Lbl Couplingmentioning

confidence: 99%

“…[14] then states that the LW Higgs partner contribution acts in the direction of reconciling the discrepancy, and concludes that δg bb L analysis gives no meaningful bound on the LW scalar mass. However, Eq.…”

Section: Constraints From the Zb Lbl Couplingmentioning

confidence: 99%

“…The central result of Ref. [14] is that current precision bounds allow LW Higgs partner masses to be significantly lighter than other LW states. Therefore, [14] effectively compute δg bb L including only a LW Higgs partner in the triangle loop diagram, giving (in our normalization):…”

Section: Constraints From the Zb Lbl Couplingmentioning

confidence: 99%

“…If all LW masses are comparable, then the lower bound on this scale is typically ∼ 7 TeV. The LW Higgs partners, on the other hand, appear to be much less tightly constrained and produce milder constraints on collider phenomenology [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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Precision electroweak constraints on theN=3Lee-Wick standard model

Lebed

TerBeek

2013

Phys. Rev. D

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The Lee-Wick (LW) formulation of higher-derivative theories can be extended from one in which the extra degrees of freedom are represented as a single heavy, negative-norm partner for each known particle (N = 2), to one in which a second, positive-norm partner appears (N = 3). We explore the extent to which the presence of these additional states in a LW Standard Model affect precision electroweak observables, and find that they tend either to have a marginal effect (e.g., quark partners on T ), or a substantial beneficial effect (e.g., Higgs partners on the Zbb couplings).We find that precision constraints allow LW partners to exist in broad regions of mass parameter space accessible at the LHC, making LW theories a viable beyond-Standard Model candidate.

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Section: Constraints From the Zb Lbl Couplingmentioning

confidence: 99%

“…As pointed out in Ref. [14], however, the heavy h ± 2 can be much lighter ( 500 GeV) and still satisfy all precision constraints. Noting first from Eq.…”

Section: Constraints From the Zb Lbl Couplingmentioning

confidence: 99%

Section: Constraints From the Zb Lbl Couplingmentioning

confidence: 99%

Section: Constraints From the Zb Lbl Couplingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Precision electroweak constraints on theN=3Lee-Wick standard model

Lebed

TerBeek

2013

Phys. Rev. D

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Vacuum stability with radiative Yukawa couplings

Gabrielli

Marzola

Müürsepp

et al. 2022

J. High Energ. Phys.

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We explore the electroweak vacuum stability in the framework of a recently proposed paradigm for the origin of Yukawa couplings. These arise as low energy effective couplings radiatively generated by portal interactions with a hidden, or dark, sector at the one-loop level. Possible tree-level Yukawa couplings are forbidden by a new underlying symmetry, assumed to be spontaneously broken by the vacuum expectation value of a new scalar field above the electroweak scale. As a consequence, the top Yukawa interaction ceases to behave as a local operator at energies above the new sector scale and, therefore, cannot contribute to the running of the quartic Higgs coupling at higher energies. By studying two complementary scenarios, we explicitly show that the framework can achieve the stability of the electroweak vacuum without particular tuning of parameters. The proposed mechanism requires the existence of a dark sector and new portal messenger scalar interactions that, connecting the Standard Model to the dark sector fields, could be tested at the LHC and future collider experiments.

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Asymptotically nonlocal gravity

Boos

Carone

2023

J. High Energ. Phys.

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Asymptotically nonlocal field theories interpolate between Lee-Wick theories with multiple propagator poles, and ghost-free nonlocal theories. Previous work on asymp- totically nonlocal scalar, Abelian, and non-Abelian gauge theories has demonstrated the existence of an emergent regulator scale that is hierarchically smaller than the lightest Lee-Wick partner, in a limit where the Lee-Wick spectrum becomes dense and decoupled. We generalize this construction to linearized gravity, and demonstrate the emergent regula- tor scale in three examples: by studying the resolution of the singularity (i) at the origin in the classical solution for the metric of a point particle, and (ii) in the nonrelativistic gravitational potential computed via a one-graviton exchange amplitude; (iii) we also show how this derived scale regulates the one-loop graviton contribution to the self energy of a real scalar field. We comment briefly on the generalization of our approach to the full, nonlinear theory of gravity.

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Constraints on the Lee-Wick Higgs sector

Cited by 39 publications

References 50 publications

Precision electroweak constraints on theN=3Lee-Wick standard model

Precision electroweak constraints on theN=3Lee-Wick standard model

Vacuum stability with radiative Yukawa couplings

Asymptotically nonlocal gravity

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