Probing right handed neutrinos at the LHeC and lepton colliders using fat jet signatures

Das, Arindam; Jana, Sudip; Mandal, Sanjoy; Nandi, Soumitra

doi:10.1103/physrevd.99.055030

Cited by 73 publications

(40 citation statements)

References 144 publications

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“…• At the LEP collider, the collaborations L3 [63,64] and DELPHI [65] searched for N produced through on-shell Z production, e + e − → Z → N ν , followed by the decays [67,68]. Furthermore, a future FCC(-ee) collider, acting as a powerful e + e − → Z factory and exploiting low backgrounds in displaced vertex searches, can improve the sensitivity drastically; down to |V eN | 2 10 −11 for m N ≈ 50 GeV [69].…”

Section: High-energy Collider Searchesmentioning

confidence: 99%

Neutrinoless double beta decay versus other probes of heavy sterile neutrinos

Bolton

Deppisch

Dev³

2020

J. High Energ. Phys.

163

138

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We make a comparative study of the neutrinoless double beta decay constraints on heavy sterile neutrinos versus other direct and indirect constraints from both lepton number conserving and violating processes, as a sensitive probe of the extent of lepton number violation and possible interference effects in the sterile sector. To this effect, we introduce a phenomenological parametrisation of the simplified one-generation seesaw model with one active and two sterile neutrino states in terms of experimentally measurable quantities, such as active-sterile neutrino mixing angles, CP phases, masses and mass splittings. This simple parametrisation enables us to analytically derive a spectrum of possible scenarios between the canonical seesaw with purely Majorana heavy neutrinos and inverse seesaw with pseudo-Dirac ones. We then go on to constrain the simplified parameters of this model from various experiments in energy, intensity and cosmic frontiers. We emphasise that the constraints from lepton number violating processes strongly depend on the mass splitting between the two sterile states and the relative CP phase between them. This is particularly relevant for the neutrinoless double beta decay constraint, which could now get significantly weaker for small mass splitting and opposite CP parities between the sterile states. It is important to keep this in mind while comparing the neutrinoless double beta decay constraint with the direct search limits in the electron flavour from high-energy colliders.

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Section: High-energy Collider Searchesmentioning

confidence: 99%

Neutrinoless double beta decay versus other probes of heavy sterile neutrinos

Bolton

Deppisch

Dev³

2020

J. High Energ. Phys.

163

138

View full text Add to dashboard Cite

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“…On the top of that, the right-handed chirality structure of U (1) R can be investigated at the LHC by measuring Forward-Backward (FB) and top polarization asymmetries in Z → tt mode [70] and which can discriminate our U (1) R Z interaction from the other Z interactions in U (1) B−L model. The investigation of other exotic decay modes (N N , χχ, S + 2 S − 2 ) of heavy Z is beyond the scope of this article and shall be presented in a future work since these will lead to remarkable multi-lepton or displaced vertex signature [71][72][73][74][75][76][77] at the colliders.…”

Section: Heavy Gauge Boson Z At the Lhcmentioning

confidence: 99%

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

2019

Self Cite

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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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“…where M [98][99][100][101][102][103][104][105][106][107][108][109][110][111][112]. A detailed study of the implications of our model at colliders goes beyond the scope of this paper and is deferred for a future work.…”

Section: Lepton Masses and Mixingsmentioning

confidence: 99%

Fermion masses and mixings and some phenomenological aspects of a 3-3-1 model with linear seesaw mechanism

2019

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We propose a viable model based on the SU (3)C × SU (3)L × U (1)X gauge group supplemented by the S4 family symmetry and other auxiliary cyclic symmetries, whose spontaneous breaking gives rise to the observed pattern of SM fermion masses and mixing angles. In the proposed model the small light active neutrino masses are generated from a linear seesaw mechanism mediated by three Majorana neutrinos. The model is capable of reproducing the experimental values of the physical observables of both quark and lepton sectors. Our model is predictive in the quark sector having 9 effective parameters that allow to successfully reproduce the four CKM parameters and the six Standard Model (SM) quark masses. In the SM quark sector, there is particular scenario, motivated by naturalness arguments, which allows a a good fit for its ten observables, with only six effective parameters. We also study the single heavy scalar production via gluon fusion mechanism at proton-proton collider. Our model is also consistent with the experimental constraints arising from the Higgs diphoton decay rate.

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Probing right handed neutrinos at the LHeC and lepton colliders using fat jet signatures

Cited by 73 publications

References 144 publications

Neutrinoless double beta decay versus other probes of heavy sterile neutrinos

Neutrinoless double beta decay versus other probes of heavy sterile neutrinos

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

Fermion masses and mixings and some phenomenological aspects of a 3-3-1 model with linear seesaw mechanism

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