Doubly-charged scalars in the type II seesaw mechanism: Fundamental symmetry tests and high-energy searches

Dev, P. S. Bhupal; Ramsey-Musolf, Michael J.; Zhang, Yongchao

doi:10.1103/physrevd.98.055013

Cited by 53 publications

(48 citation statements)

References 167 publications

(225 reference statements)

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“…This difference in the lower mass bound from LHC for normal and inverted ordering will not cause a meaningful impact on our conclusions and with this understanding in mind, we will simply quote those in Eq.(3.5). There are other important limits on this scenario [83,[95][96][97][98] but the ones we quote are the most relevant. For a more complete discussion of the collider bounds on the type II seesaw we refer to [99].…”

Section: Searches For a Doubly Charged Scalar At The Lhcmentioning

confidence: 99%

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Lepton flavor violation and collider searches in a type I + II seesaw model

et al. 2019

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Neutrino are massless in the Standard Model. The most popular mechanism to generate neutrino masses are the type I and type II seesaw, where right-handed neutrinos and a scalar triplet are augmented to the Standard Model, respectively. In this work, we discuss a model where a type I + II seesaw mechanism naturally arises via spontaneous symmetry breaking of an enlarged gauge group. Lepton flavor violation is a common feature in such setup and for this reason, we compute the model contribution to the µ → eγ and µ → 3e decays. Moreover, we explore the connection between the neutrino mass ordering and lepton flavor violation in perspective with the LHC, HL-LHC and HE-LHC sensitivities to the doubly charged scalar stemming from the Higgs triplet. Our results explicitly show the importance of searching for signs of lepton flavor violation in collider and muon decays. The conclusion about which probe yields stronger bounds depends strongly on the mass ordering adopted, the absolute neutrino masses and which much decay one considers. In the 1 − 5 TeV mass region of the doubly charged scalar, lepton flavor violation experiments and colliders offer orthogonal and complementary probes. Thus if a signal is observed in one of the two new physics searches, the other will be able to assess whether it stems from a seesaw framework.

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Section: Searches For a Doubly Charged Scalar At The Lhcmentioning

confidence: 99%

“…The presence of a doubly charged scalar in the spectrum is typical signature of a type II seesaw mechanism [78][79][80][81][82][83][84][85][86]. Typically, this type II seesaw is realized by the addition of a scalar triplet.…”

Section: Searches For a Doubly Charged Scalar At The Lhcmentioning

confidence: 99%

Lepton flavor violation and collider searches in a type I + II seesaw model

et al. 2019

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“…A nonzero v ∆ breaks the (B − L) symmetry spontaneously and can be related to the neutrino mass by the following expression [18,96]…”

Section: The Modelmentioning

confidence: 99%

Connection between νn→ν¯n¯ reactions and n−
Hao
¹

2020
Phys. Rev. D
3
0
1
0
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In this work, we investigate the connection and compatibility between νn →νn reactions and n-n oscillations based on the SU (3)c×SU (2)L×U (1) symmetry model with additional Higgs triplets. We explore the possibility that the scattering process νn →νn produced by low-energy solar neutrinos gives rise to an unavoidable background in the measurements of n-n oscillations. We focus on two different scenarios, depending on whether the (B − L) symmetry could be broken. We analyze the interplay of the various constraints on the two processes and their observable consequences. In the scenario where both (B + L) and (B − L) could be broken, we point out that if all the requirements, mainly arising from the type-II seesaw mechanism, are satisfied, the parameter space would be severely constrained. In this case, although the masses of the Higgs triplet bosons could be within the reach of a direct detection at the LHC or future high-energy experiments, the predicted n-n oscillation times would be completely beyond the detectable regions of the present experiments. In both scenarios, the present experiments are unable to distinguish a νn →νn reaction event from a n-n oscillation event within the accessible energy range. Nevertheless, if any of the two processes is detected, there could be signal associated with new physics beyond the Standard Model.

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“…In the type I seesaw mechanism, heavy right-handed neutrinos lead to small neutrino masses, whereas in the type II seesaw the small scalar triplet vev justifies the small neutrino masses [59][60][61][62][63][64][65][66][67][68][69][70][71]. Notice that these mechanisms are completely different from one another but at the end have the same goal.…”

Section: Seesaw Realizations In the 2hdm-u(1)mentioning

confidence: 99%

Type I + II seesaw in a Two Higgs Doublet Model

et al. 2019

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Two Higgs Doublet Models (2HDM) are popular extensions of the Standard Model for several reasons, but do not explain neutrino masses. In this work, we investigate how one can incorporate neutrino masses within the framework of the 2HDM-U(1), where U(1) is an abelian gauge symmetry used to nicely address the absence of flavor changing neutral currents in 2HDM. In particular, we explore realizations of the type I and type II seesaw since they are mechanisms that we dote on for being able to generate elegantly small active neutrino masses. We show that one can build several models featuring type I, type II and type I+II seesaw mechanism with different phenomenological implications.

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Doubly-charged scalars in the type II seesaw mechanism: Fundamental symmetry tests and high-energy searches

Cited by 53 publications

References 167 publications

Lepton flavor violation and collider searches in a type I + II seesaw model

Lepton flavor violation and collider searches in a type I + II seesaw model

Connection between νn→ν¯n¯ reactions and n−
Hao
¹

2020
Phys. Rev. D
3
0
1
0
View full text Add to dashboard Cite

Type I + II seesaw in a Two Higgs Doublet Model

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Doubly-charged scalars in the type II seesaw mechanism: Fundamental symmetry tests and high-energy searches

Cited by 53 publications

References 167 publications

Lepton flavor violation and collider searches in a type I + II seesaw model

Lepton flavor violation and collider searches in a type I + II seesaw model

Connection between νn→ν¯n¯ reactions and n−Hao1 2020Phys. Rev. D3010View full textAdd to dashboardCite

Type I + II seesaw in a Two Higgs Doublet Model

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Connection between νn→ν¯n¯ reactions and n−
Hao
¹

2020
Phys. Rev. D
3
0
1
0
View full text Add to dashboard Cite