Simplest radiative Dirac neutrino mass models

Saad, Shaikh

doi:10.1016/j.nuclphysb.2019.114636

Cited by 35 publications

(27 citation statements)

References 114 publications

(162 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, tree-level Dirac type-I seesaw with proper choices for the U(1) B−L charges have been shown to be consistent without require any extra ad-hoc discrete symmetries [17]. In recent works, it has been shown that even for one-loop Dirac neutrino masses, it is possible to have U(1) B−L as the only extra symmetry beyond the SM [24][25][26] 1 .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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: Introductionmentioning

confidence: 99%

“…For extensions with only extra scalars, minimal solutions have been found with two and three loops[26].…”

mentioning

confidence: 99%

Dirac neutrino mass generation from a Majorana messenger

2020

View full text Add to dashboard Cite

show abstract

“…Whereas a systematic classification of Majorana neutrino mass mechanisms and identifying minimal models are extensively discussed in the literature [74][75][76][77][78][79][80][81][82][83], similar analysis for the case of Dirac neutrinos are still lacking. Along this direction, some recent attempts are taken: a systematic classification of tree-level and one-loop mass mechanisms at d = 4 [84], d = 5 [85,86], d = 6 [87,88], two-loop mass models at d = 4 [84,89], selecting minimal models at one-loop [49] and identifying simplest models at one-loop, two-loop and three-loop [53] are considered.…”

Section: Higgsmentioning

confidence: 99%

Minimal realizations of Dirac neutrino mass from generic one-loop and two-loop topologies at d=5

Jana

Vishnu

Saad

2020

J. Cosmol. Astropart. Phys.

Self Cite

View full text Add to dashboard Cite

We carry out a systematic investigation for the minimal Dirac neutrino mass models emerging from generic one-loop and two-loop topologies that arise from d = 5 effective operator with a singlet scalar, σ. To ensure that the tree-level Dirac mass, as well as Majorana mass terms at all orders, are absent for the neutrinos, we work in the framework where the Standard Model is supplemented by the well-motivated U (1) B−L gauge symmetry. At the one-loop level, we analyze six possible topologies, out of which two of them have the potential to generate desired Dirac neutrino mass. Adopting a systematic approach to select minimal models, we construct seventeen viable one-loop Dirac neutrino mass models. By embracing a similar methodical approach at the two-loop, we work out twenty-three minimal candidates. Among the forty selected economical models, the majority of the models proposed in this work are new. In our search, we also include the scenarios where the particles in the loop carry charges under the color group. Furthermore, we discuss the possible dark matter candidates within a given model, if any, without extending the minimal particle content.

show abstract

“…Within this framework, by employing the U (1) R symmetry we construct a tree-level Dirac seesaw model [27] and two models where neutrino mass appears at the one-loop level. One of these loop models presented in this work is the most minimal model of radiative Dirac neutrino mass [28] and the second model uses the scotogenic mechanism [29] that links two seemingly uncorrelated phenomena: neutrino mass with Dark Matter (DM). As we will discuss, the stability of the DM in the latter scenario is a consequence of a residual Z 2 discrete symmetry that emerges from the spontaneous breaking of the U (1) R gauge symmetry.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, we also study the associated charged lepton flavor violating processes, dark matter phenomenology and cosmological constraints of these models. * metry [30] for generating the Dirac neutrino mass [28,[31][32][33][34][35]. Both of the two possibilities are attractive and can be regarded as the minimal gauge extensions of the SM.…”

mentioning

confidence: 99%

Minimal dirac neutrino mass models from $$\hbox {U}(1)_{\mathrm{R}}$$ gauge symmetry and left–right asymmetry at colliders

2019

Self Cite

View full text Add to dashboard Cite

In this work, we propose minimal realizations for generating Dirac neutrino masses in the context of a right-handed abelian gauge extension of the Standard Model. Utilizing only U (1) R symmetry, we address and analyze the possibilities of Dirac neutrino mass generation via (a) tree-level seesaw and (b) radiative correction at the one-loop level. One of the presented radiative models implements the attractive scotogenic model that links neutrino mass with Dark Matter (DM), where the stability of the DM is guaranteed from a residual discrete symmetry emerging from U (1) R . Since only the right-handed fermions carry non-zero charges under the U (1) R , this framework leads to sizable and distinctive Left-Right asymmetry as well as Forward-Backward asymmetry discriminating from U (1) B−L models and can be tested at the colliders.We analyze the current experimental bounds and present the discovery reach limits for the new heavy gauge boson Z at the LHC and ILC. Furthermore, we also study the associated charged lepton flavor violating processes, dark matter phenomenology and cosmological constraints of these models. * metry [30] for generating the Dirac neutrino mass [28,[31][32][33][34][35]. Both of the two possibilities are attractive and can be regarded as the minimal gauge extensions of the SM. However, the phenomenology of U (1) R model is very distinctive compared to the U (1) B−L case. In the literature, gauged U (1) B−L symmetry has been extensively studied whereas gauged U (1) R extension has received very little attention.Unlike the U (1) B−L case, in our set-up, the SM Higgs doublet is charged under this U (1) R symmetry to allow the desired Yukawa interactions to generate mass for the charged fermions, this leads to interactions with the new gauge boson that is absent in U (1) B−L model. The running of the Higgs quartic coupling gets modified due to having such interactions with the new gauge boson Z that can make the Higgs vacuum stable [36]. Due to the same reason, the SM Higgs phenomenology also gets altered [37].We show by detail analysis that despite their abelian nature, U (1) R and U (1) B−L have distinguishable phenomenology. The primary reason that leads to different features is:U (1) R gauge boson couples only to the right-handed chiral fermions, whereas U (1) B−L is chirality-universal. As a consequence, U (1) R model leads to large left-right (LR) asymmetry and also forward-backward (FB) asymmetry that can be tested in the current and future colliders that make use of the polarized initial states, such as in ILC. We also comment on the differences of our U (1) R scenario with the other U (1) R models existing in the literature. Slightly different features emerge as a result of different charge assignment of the righthanded neutrinos in our set-up for the realization of Dirac neutrino mass. In the existing U (1) R models, flavor universal charge assignment for the right-handed neutrinos are considered and neutrinos are assumed to be Majorana particles. Whereas, in our set-up, neutrinos are Dira...

show abstract

Simplest radiative Dirac neutrino mass models

Cited by 35 publications

References 114 publications

Dirac neutrino mass generation from a Majorana messenger

Dirac neutrino mass generation from a Majorana messenger

Minimal realizations of Dirac neutrino mass from generic one-loop and two-loop topologies at d=5

Minimal dirac neutrino mass models from $$\hbox {U}(1)_{\mathrm{R}}$$ gauge symmetry and left–right asymmetry at colliders

Contact Info

Product

Resources

About