A new B − L model without right-handed neutrinos

Patra, Sudhanwa; Rodejohann, Werner; Yaguna, Carlos E.

doi:10.1007/jhep09(2016)076

Cited by 46 publications

(65 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(22) with f → f /3 to n α = (−2/3, −2/3, −4/3, −1/3) as used in Ref. [83]. In this way, without lost of generality, we will work with the normalized solution in terms of a single parameter [53][54][55] that we choose to be l, by setting r = 1 as summarized in column U(1) X of Table 2, which is just…”

Section: A U(1) X Anomaly Cancellationmentioning

confidence: 99%

Dirac neutrino mass generation from a Majorana messenger

2020

View full text Add to dashboard Cite

The radiative type-I seesaw has been already implemented to explain the lightness of Majorana neutrinos with both Majorana and Dirac heavy fermions, and the lightness of Dirac neutrinos with Dirac heavy fermions. In this work we present a minimal implementation of the radiative type-I seesaw with light Dirac neutrinos and heavy Majorana fermions. An inert doublet and a complex singlet scalar complete the dark sector which is protected by an Abelian fermiophobic gauge symmetry that also forbids tree level mass contributions for the full set of light neutrinos. A fermion vector-like extension of the model is also proposed where the light right-handed neutrinos can thermalize in the primordial plasma and the extra gauge boson can be directly produced at colliders. In particular, the current upper bound on ∆N eff reported by PLANCK points to large ratios M Z /g 40 TeV which can be competitive with collider constraint for g sufficiently large in the ballpark of the Standard Model values, while future cosmic microwave background experiments may probe all the no minimal models presented here.

show abstract

Section: A U(1) X Anomaly Cancellationmentioning

confidence: 99%

Dirac neutrino mass generation from a Majorana messenger

2020

View full text Add to dashboard Cite

show abstract

“…of these four possible combinations, axial vector anomaly [31,32] and gravitational gauge anomaly [33,34] of local B−L symmetric models can be cancelled by the introduction of extra chiral fermions to the SM such as three right handed neutrinos [35] or two left and right handed singlet fermions with appropriate B−L charges [36]. However, unlike the B−L case, the anomaly cancellation does not require any extra chiral fermionic degrees of freedom for the last three cases where the linear combinations of different generational lepton numbers [37][38][39] are considered.…”

Section: Jhep09(2016)147mentioning

confidence: 99%

Neutrino mass, dark matter and anomalous magnetic moment of muon in a U 1 L μ − L τ $$ \mathrm{U}{(1)}_L{{}_{{}_{\mu}}}_{-}{{}_L}_{{}_{\tau }} $$ model

Biswas

Choubey

Khan

2016

J. High Energ. Phys.

View full text Add to dashboard Cite

The observation of neutrino masses, mixing and the existence of dark matter are amongst the most important signatures of physics beyond the Standard Model (SM). In this paper, we propose to extend the SM by a local L µ −L τ gauge symmetry, two additional complex scalars and three right-handed neutrinos. The L µ − L τ gauge symmetry is broken spontaneously when one of the scalars acquires a vacuum expectation value. The L µ − L τ gauge symmetry is known to be anomaly free and can explain the beyond SM measurement of the anomalous muon (g − 2) through additional contribution arising from the extra Z µτ mediated diagram. Small neutrino masses are explained naturally through the Type-I seesaw mechanism, while the mixing angles are predicted to be in their observed ranges due to the broken L µ − L τ symmetry. The second complex scalar is shown to be stable and becomes the dark matter candidate in our model. We show that while the Z µτ portal is ineffective for the parameters needed to explain the anomalous muon (g − 2) data, the correct dark matter relic abundance can easily be obtained from annihilation through the Higgs portal. Annihilation of the scalar dark matter in our model can also explain the Galactic Centre gamma ray excess observed by Fermi-LAT. We show the predictions of our model for future direct detection experiments and neutrino oscillation experiments.

show abstract

“…Very recently, another anomaly free U (1) B−L framework was proposed where the additional right handed fermions possess more exotic B − L charges namely, −4/3, −1/3, −2/3, −2/3 [100]. The triangle anomalies get cancelled as follows.…”

Section: Gauged B − L Symmetrymentioning

confidence: 99%

Type III seesaw for neutrino masses in U(1)B−L model with multi-component dark matter

Biswas

Borah

Nanda

2019

J. High Energ. Phys.

View full text Add to dashboard Cite

We propose a B − L gauged extension of the Standard Model where light neutrino masses arise from type III seesaw mechanism. Unlike the minimal B −L model with three right handed neutrinos having unit lepton number each, the model with three fermion triplets is however not anomaly free. We show that the leftover triangle anomalies can be cancelled by two neutral Dirac fermions having fractional B − L charges, both of which are naturally stable by virtue of a remnant Z 2 × Z 2 symmetry, naturally leading to a two component dark matter scenario without any ad-hoc symmetries. We constrain the model from all relevant phenomenological constraints including dark matter properties. Light neutrino mass and collider prospects are also discussed briefly. Due to additional neutral gauge bosons, the fermion triplets in type III seesaw can have enhanced production cross section in collider experiment.

show abstract

A new B − L model without right-handed neutrinos

Cited by 46 publications

References 49 publications

Dirac neutrino mass generation from a Majorana messenger

Dirac neutrino mass generation from a Majorana messenger

Neutrino mass, dark matter and anomalous magnetic moment of muon in a U 1 L μ − L τ $$ \mathrm{U}{(1)}_L{{}_{{}_{\mu}}}_{-}{{}_L}_{{}_{\tau }} $$ model

Type III seesaw for neutrino masses in U(1)B−L model with multi-component dark matter

Contact Info

Product

Resources

About