LHC Run I bounds on minimal lepton flavour violation in Type-III see-saw: a case study

Agostinho, Nuno Rosa; Éboli, Oscar José Pinto; Gonzalez-Garcia, M. C.

doi:10.1007/jhep11(2017)118

Cited by 6 publications

(13 citation statements)

References 67 publications

(106 reference statements)

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“…In other words, once the known oscillation parameters are fixed to their best fit values, and the remaining unknown parameters 3 characterizingm (the Dirac phase δ, the Majorana phase α 2 and the mass hierarchy) are specified, the d = 6 operator is fixed up to an overall factor that we parametrize through θ e . 4 This same conclusion via a different parametrization was first derived in the context of the Type-I Seesaw in [22], and applied to the Type-III Seesaw case in [29,30].…”

Section: Two Triplets Seesaw Scenario (2σ-ss)mentioning

confidence: 64%

“…[24] and partially updated in ref. [25], while the other cases were considered mostly in relation to the LHC phenomenology [26][27][28][29][30][31] so far. In ref.…”

Section: Jhep05(2020)022mentioning

confidence: 99%

“…Therefore, while the goal of this paper is to set bounds on the considered models, its natural prosecution is the analysis of LHC phenomenology, partially carried out in refs. [29,30].…”

Section: Jhep05(2020)022mentioning

confidence: 99%

“…The minimal 2Σ-SS and next to minimal 3Σ-SS symmetry protected scenarios are particularly interesting since the constrained Yukawa flavor structure offers the possibility of testing this neutrino mass generation mechanism. The potential of the LHC regarding this possibility has been already analyzed in [29] and, more recently, in [30] in the context of the 2Σ-SS model.…”

Section: Present Lhc Bounds On the (2σ-ss And 3σ-ss) New Physics Scalementioning

confidence: 99%

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Global bounds on the Type-III Seesaw

et al. 2020

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We derive general bounds on the Type-III Seesaw parameters from a global fit to flavor and electroweak precision data. We explore and compare three Type-III Seesaw realizations: a general scenario, where an arbitrary number of heavy triplets is integrated out without any further assumption, and the more constrained cases in which only 3 or 2 (minimal scenario) additional heavy states are included. The latter assumption implies rather non-trivial correlations in the Yukawa flavor structure of the model so as to reproduce the neutrino masses and mixings as measured in neutrino oscillations experiments and thus qualitative differences can be found with the more general scenario. In particular, we find that, while the bounds on most elements of the dimension 6 operator coefficients are of order 10 −4 for the general and 3-triplet cases, the 2-triplet scenario is more strongly constrained with bounds between 10 −5 and 10 −7 for the different flavours. We also discuss how these correlations affect the present CMS constraints on the Type-III Seesaw in the minimal 2-triplet scenario.

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Section: Two Triplets Seesaw Scenario (2σ-ss)mentioning

confidence: 64%

“…[24] and partially updated in ref. [25], while the other cases were considered mostly in relation to the LHC phenomenology [26][27][28][29][30][31] so far. In ref.…”

Section: Jhep05(2020)022mentioning

confidence: 99%

“…Therefore, while the goal of this paper is to set bounds on the considered models, its natural prosecution is the analysis of LHC phenomenology, partially carried out in refs. [29,30].…”

Section: Jhep05(2020)022mentioning

confidence: 99%

Section: Present Lhc Bounds On the (2σ-ss And 3σ-ss) New Physics Scalementioning

confidence: 99%

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Global bounds on the Type-III Seesaw

et al. 2020

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“…For recent summaries on cLFV in the Type III Seesaw, see Refs. [176,[476][477][478] and references therein.…”

Section: The Type III Seesaw and Lepton Number Violation At Collidersmentioning

confidence: 99%

Lepton Number Violation: Seesaw Models and Their Collider Tests

et al. 2018

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The Majorana nature of neutrinos is strongly motivated from the theoretical and phenomenological point of view. A plethora of neutrino mass models, known collectively as Seesaw models, exist that could generate both a viable neutrino mass spectrum and mixing pattern. They can also lead to rich, new phenomenology, including lepton number non-conservation as well as new particles, that may be observable at collider experiments. It is therefore vital to search for such new phenomena and the mass scale associated with neutrino mass generation at high energy colliders. In this review, we consider a number of representative Seesaw scenarios as phenomenological benchmarks, including the characteristic Type I, II, and III Seesaw mechanisms, their extensions and hybridizations, as well as radiative constructions. We present new and updated predictions for analyses featuring lepton number violation and expected coverage in the theory parameter space at current and future colliders. We emphasize new production and decay channels, their phenomenological relevance and treatment across different facilities in e + e − , e − p, and pp collisions, as well as the available Monte Carlo tools available for studying Seesaw partners in collider environments.

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The two scales of new physics in Higgs couplings

D’Agnolo,

Nortier,

Rigo

et al. 2023

J. High Energ. Phys.

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Higgs coupling deviations from Standard Model predictions contain information about two scales of Nature: that of new physics responsible for the deviation, and the scale where new bosons must appear. The two can coincide, but they do not have to. The scale of new bosons can be calculated by going beyond an effective field theory description of the coupling deviation. We compute model-independent upper bounds on the scale of new bosons for deviations in Higgs to WW and ZZ couplings, finding that any measured deviation at present or future colliders requires the existence of new bosons within experimental reach. This has potentially interesting implications for naturalness.

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LHC Run I bounds on minimal lepton flavour violation in Type-III see-saw: a case study

Cited by 6 publications

References 67 publications

Global bounds on the Type-III Seesaw

Global bounds on the Type-III Seesaw

Lepton Number Violation: Seesaw Models and Their Collider Tests

The two scales of new physics in Higgs couplings

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