Towards deconstructing the simplest seesaw mechanism

Mandal, Sanjoy; Miranda, O. G.; Garcia, G. Sanchez; Valle, J. W. F.; Xu, Xun-Jie

doi:10.48550/arxiv.2203.06362

Cited by 3 publications

(4 citation statements)

References 97 publications

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“…Previous studies on this aspect have been investigated in numerous works including, for example, Refs. [21][22][23][24][25][26][27][28][29]. The test of the type II seesaw leptogenesis from lepton flavor violation can be also found in [30].…”

Section: Introductionmentioning

confidence: 95%

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Testing the type II seesaw leptogenesis at the LHC

Han¹,

Lei²,

Liao³

2023

Preprint

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The type II seesaw leptogenesis simultaneously explains the origin of neutrino masses, the baryon asymmetry of our universe, and the inflation. The large hadron collider(LHC) provides an opportunity to directly test the type II seesaw leptogenesis by looking for the predicted triplet Higgs. In this paper, we perform an analysis of the detection prospect for the triplet Higgs at the LHC through the multi-lepton channels. We find that due to the contribution of pp → H ±± H ∓ process, the sensitivity of multi-lepton channels searching for the doubly-charged Higgs pair production can be improved. We also investigate the 3l + E miss T signals to probe the pp → H ±± H ∓ production and find that the future high luminosity LHC could probe a triplet Higgs around 1.2 TeV at 2σ level.

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Section: Introductionmentioning

confidence: 95%

“…The decay modes of triplet Higgs with different v ∆ −∆m parameters have been thoroughly discussed in Refs. [28,29]. We consider ∆m < O(1)GeV and v ∆ < 10 −4 GeV,thus the doublycharged Higgs H ±± mostly decays to leptonic final states.…”

Section: Production and Decay Of The Triplet Higgsmentioning

confidence: 99%

Testing the type II seesaw leptogenesis at the LHC

Han¹,

Lei²,

Liao³

2023

Preprint

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“…The most important relevant electroweak precision constraints(EWPC) are the oblique, aka Peskin−Takeuchi [78] S, T, U parameters [79][80][81], which represent the contribution of BSM physics to the SM gauge sector. Since the triplet scalar carries no hypercharge, its contribution to S parameter is absent.…”

Section: Bounds From Electroweak Precision Experimentsmentioning

confidence: 99%

The Triplet Dirac Seesaw in the View of the Recent CDF-II W Mass Anomaly

Попов¹,

Srivastava²

2022

Preprint

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In the present letter, a Dirac neutrino mass model is presented in the view of the new result on W boson mass of m CDF −II W = 80.4335 ± 0.0094 GeV, recently reported by the CDF-II experimental collaboration. The newly measured value of the W mass anomaly shows a 7-σ deviation from that predicted by the standard model. The model explains the CDF-II W boson mass anomaly by extending the standard model with hypercharge zero vector-like fermion triplet. Symmetry is amended with a global U (1) B−L which is broken with an hypercharge zero electroweak triplet. It is demonstrated that the model can successfully explain CDF-II result, Dirac neutrino mass origin, while satisfying standard model precision constraints and collider constraints with scalar and fermion triplet masses in the ranger 1.4 TeV−5.2 TeV and 100 TeV −10 13 GeV, respectively.

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“…We have kept terms of v 2 ∆ /v 2 which have been neglected in previous studies [34,126]. The overall triplet contributions to the oblique parameters should contain the tree-level one in Eq.…”

Section: Hmentioning

confidence: 99%

Electroweak precision tests for triplet scalars

Yu¹,

He²,

Huang³

et al. 2022

Preprint

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Electroweak precision observables are fundamentally important for testing the standard model (SM) or its extensions. The influences to observables from new physics within the electroweak sector can be expressed in terms of oblique parameters S, T, U. The recently reported W mass excess anomaly by CDF modifies these parameters in a significant way. By performing the global fit with the CDF new W mass measurement data, we obtain S = 0.03 ± 0.03, T = 0.06 ± 0.02 and U = 0.16 ± 0.03 (or S = 0.14 ± 0.03, T = 0.24 ± 0.02 with U = 0) which is significantly away from zero as SM would predict. The CDF excess strongly indicates the need of new physics beyond SM. We carry out a global fit to study the influence of two different cases of simple extensions by a hyper-charge Y = 1 triplet scalar ∆ (corresponding to the type-II seesaw model) and a Y = 0 real triplet scalar Σ on electroweak precision tests to determine parameter space in these models to solve the W mass anomaly and discuss the implications. We find that these triplets can affect the oblique parameters significantly at the tree and loop levels. For Y = 1 case, there are seven new scalars in the model. The tree and scalar loop effects on oblique parameters can be expressed in terms of three parameters, the neutral CP-even mass mH , potential parameter λ4 and triplet vev v∆. Our global fit obtains mH = 296.02 ± 10.18 GeV, λ4 = 2.58 ± 0.09 and v∆ = 4.82 ± 0.34 GeV. These parameter correspondingly results in mass difference ∆m 2 = (197.49 ± 3.45GeV) 2 . Using these fit values, we further obtain m H ++ = 98.09 ± 20.02GeV, which satisfies the current LHC constraints. We also further adopt the phenomenological analysis, such as vacuum stability and perturbative unitarity, Higgs data and triple Higgs self-coupling. Furthermore, we find that the future lepton colliders can feasibly search for doubly charged H ++ via pair production H ++ H −− and decay channel to four W final states. For Y = 0 case, there are four new scalars in the model. The tree and new scalar effects on the oblique parameters can be parameterized by the singly charged mass m H + , the mass difference ∆m = m H + − m H 0 and triplet vev vΣ. Our global fit obtains m H + = 77.16 ± 17.12 GeV, ∆m = −14.27 ± 4.22 GeV and vΣ = 3.20 ± 0.30 GeV. However, these strongly violate the perturbative unitarity of the potential parameter b4, which can only be satisfied within 3σ errors.

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Towards deconstructing the simplest seesaw mechanism

Cited by 3 publications

References 97 publications

Testing the type II seesaw leptogenesis at the LHC

Testing the type II seesaw leptogenesis at the LHC

The Triplet Dirac Seesaw in the View of the Recent CDF-II W Mass Anomaly

Electroweak precision tests for triplet scalars

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