Phenomenology of the gauge symmetry for right-handed fermions

Chao, Wei

doi:10.1140/epjc/s10052-018-5547-0

Cited by 19 publications

(20 citation statements)

References 68 publications

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“…This system has two different types of solutions. The simplest solution corresponds to the case of flavor universal charge assignment that demands: R ν1,2,3 = R H which has been studied in the literature [38][39][40][41][42]. In this work, we adopt the alternative choice of flavor non-universal solution and show that the predictions and phenomenology of this set-up can be very different from the flavor universal scenario.…”

Section: )mentioning

confidence: 98%

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

2019

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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...

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Section: )mentioning

confidence: 98%

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

2019

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“…In the fermion JHEP01(2018)099 sector, we add three families of right-handed Majorana fermions ν a R (a = 1 − 3) to cancel the U(1) R anomalies among SM fermions, which are the same assignments as refs. [6,7] due to their zero charges for the other exotic fermions; Q and L . Three Q and L are also introduced to cancel the U(1) L anomalies among SM fermions, whose assignments are similar to the one of ref.…”

Section: Model Setup and Constraintsmentioning

confidence: 99%

“…A new right-handed gauge symmetry U(1) R [1][2][3][4][5][6][7] is one of the promising candidates naturally to accommodate the three right-handed neutrinos to achieve the anomaly cancellations, whose nature is the same as a theory of B − L gauge symmetry [8]. In addition, it is a verifiable and characteristic candidate to be tested by phenomena at current and future collider experiments such as international linear collider (ILC) [9] by measuring several differential cross sections for purely polarized initial states as well as the large hadron collider (LHC).…”

Section: Introductionmentioning

confidence: 99%

“…However one might think why only the U(1) R gauge symmetry is there, and/or what about the left-handed type gauge symmetry U(1) L under which only left-handed fermions are charged. Actually the minimal U(1) R model requires its rather large breaking scale ∼ O (20) TeV, due to a few number of parameters in the gauge sector [6,7], which can be relaxed considering U(1) L gauge symmetry. It is thus interesting to consider U(1) L gauge symmetry together with the U(1) R symmetry and discuss how to distinguish the two types of gauge interactions at the collider experiments.…”

Section: Introductionmentioning

confidence: 99%

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Left-handed and right-handed U(1) gauge symmetry

Nomura¹,

Okada²

2018

J. High Energ. Phys.

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We propose a model with the left-handed and right-handed continuous Abelian gauge symmetry; U(1) L ×U(1) R . Then three right-handed neutrinos are naturally required to achieve U(1) R anomaly cancellations, while several mirror fermions are also needed to do U(1) L anomaly cancellations. Then we formulate the model, and discuss its testability of the new gauge interactions at collider physics such as the large hadron collider (LHC) and the international linear collider (ILC). In particular, we can investigate chiral structure of the interactions by the analysis of forward-backward asymmetry based on polarized beam at the ILC.

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“…The inverse seesaw mechanism requires a left-handed neutral fermions S L in addition to the right-handed ones N R , and provides us more complicated neutrino mass matrix which can make mass hierarchies softer than the other models such as canonical seesaw [46][47][48][49] and provide rich phenomenologies such as unitarity constraints [50,51]. The U (1) R symmetry requires three SM singlet fermions with non-zero U (1) R charge to cancel gauge anomaly [52][53][54][55][56] and forbid unnecessary Yukawa interactions to obtain inverse seesaw mechanism. We then assign A 4 triplet representation to S L and N R , and some relevant Yukawa couplings are written in terms of modular form providing a constrained 1 Some reviews are useful to understand the non-Abelian group and its applications to flavor structure [34][35][36][37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

An inverse seesaw model with $U(1)_R$ gauge symmetry

Nomura

Okada

2018

LHEP

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We discuss an inverse seesaw model based on right-handed fermion specific U (1) gauge symmetry and A 4 -modular symmetry. These symmetries forbid unnecessary terms and restrict structures of Yukawa interactions which are relevant to inverse seesaw mechanism. Then we can obtain some predictions in neutrino sector such as Dirac-CP phase and sum of neutrino mass, which are shown by our numerical analysis. Besides the relation among masses of heavy pseudo-Dirac neutrino can be obtained since it is also restricted by the modular symmetry. We also discuss implications to lepton flavor violation and collider physics in our model. * Electronic address: nomura@kias.re.kr † Electronic address: hiroshi.okada@apctp.org ‡ Electronic address: sudhanwa@iitbhilai.ac.in

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Phenomenology of the gauge symmetry for right-handed fermions

Cited by 19 publications

References 68 publications

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

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

Left-handed and right-handed U(1) gauge symmetry

An inverse seesaw model with $U(1)_R$ gauge symmetry

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