Left-handed neutrino mass scale and spontaneously broken lepton number

Gelmini, Graciela B.; Roncadelli, M.

doi:10.1016/0370-2693(81)90559-1

Cited by 1,129 publications

(787 citation statements)

References 8 publications

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“…(ii) Majorana particles with a pseudo-scalar coupling with a Majoron [9,10] and a sterile neutrino giving rise to the decay ν j → ν s + J. The Majoron should be dominantly singlet to comply with the constraints from LEP data on the Z decay to invisible particles.…”

Section: Jhep02(2018)055mentioning

confidence: 99%

A study of invisible neutrino decay at DUNE and its effects on θ23 measurement

Choubey

Goswami

Pramanik

2018

J. High Energ. Phys.

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Abstract:We study the consequences of invisible decay of neutrinos in the context of the DUNE experiment. We assume that the third mass eigenstate is unstable and decays to a light sterile neutrino and a scalar or a pseudo-scalar. We consider DUNE running in 5 years neutrino and 5 years antineutrino mode and a detector volume of 40 kt. We obtain the expected sensitivity on the rest-frame life-time τ 3 normalized to the mass m 3 as τ 3 /m 3 > 4.50 × 10 −11 s/eV at 90% C.L. for a normal hierarchical mass spectrum. We also find that DUNE can discover neutrino decay for τ 3 /m 3 > 4.27 × 10 −11 s/eV at 90% C.L. In addition, for an unstable ν 3 with an illustrative value of τ 3 /m 3 = 1.2 × 10 −11 s/eV, the no decay case could get disfavoured at the 3σ C.L. At 90% C.L. the expected precision range for this true value is obtained as 1.71 × 10 −11 > τ 3 /m 3 > 9.29 × 10 −12 in units of s/eV. We also study the correlation between a non-zero τ 3 /m 3 and standard oscillation parameters and find an interesting correlation in the appearance and disappearance channels with the mixing angle θ 23 . This alters the octant sensitivity of DUNE, favorably (unfavorably) for true θ 23 in the lower (higher) octant. The effect of a decaying neutrino does not alter the hierarchy or CP violation discovery sensitivity of DUNE in a discernible way.

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Section: Jhep02(2018)055mentioning

confidence: 99%

A study of invisible neutrino decay at DUNE and its effects on θ23 measurement

Choubey

Goswami

Pramanik

2018

J. High Energ. Phys.

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“…Current bounds on BR(µ → eχ) and on BR(τ → µχ) of 2.10 −6 and 7.10 −6 [3] respectively are sufficient to constrain ν µ and ν τ lifetimes to be longer than 10 29 s and 10 20 s. The only possibility for fast invisible decays of neutrinos seems to lie with majoron models. There are two classes of models; the I=1 Gelmini-Roncadelli [4] majoron and the I=0 Chikasige-Mohapatra-Peccei [5] majoron. In general, one can choose the majoron to be a mixture of the two; furthermore the coupling can be to flavor as well as sterile neutrinos.…”

Section: Neutrino Decay Decoherence and Extra Dimensionsmentioning

confidence: 99%

Testing neutrino properties at long baseline experiments and neutrino factories

Pakvasa

2001

Nuclear Instruments and Methods in Physics Research Section A:

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Abstract. It is shown that explanations of atmospheric neutrino anomaly other than ν µ − ν τ oscillations (e.g. decay, decoherence and ν µ − ν τ − ν KK mixing) can be tested at future facilities. Stringent tests of CPT invariance in neutrino oscillations can also be performed. I INTRODUCTIONIn this talk I would like to (a) review some non-oscillatory explanations for the atmospheric neutrino data, and how they can be distinguished from the conventional oscillatory explanations in future neutrino experiments; and (b) describe briefly the strong limits that can be placed on CPT violation both from existing data as well as future experiments especially at neutrino factories. II NEUTRINO DECAY, DECOHERENCE AND EXTRA DIMENSIONSDecay If neutrinos do have masses and mixings; then in general, in addition to oscillating, the heavier neutrinos will decay to lighter ones via flavor changing processes. The only questions are (a) whether the lifetimes are short enough to be interesting and (b) what are the dominant decay modes. To be specific, let us assume that neutrino masses are at most of order eV [1].For eV neutrinos, the only radiative mode possible is ν i → ν j + γ. From the existing bounds on neutrino magnetic moments, indirect (but model independent) bounds on the decay rates for this mode can be derived: 10 −11 s −1 , 10 −17 s −1 and 10 −19 s −1 for ν τ , ν µ and ν e respectively[1].

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“…This is to ask if there are new particles with masses Λ ∼ TeV (and then c (5) ij ∼ 10 −11 ) with observable LNV signatures [34]. 4 There is a wide literature dealing with the simplest realizations of this scenario, which are referred to as see-saw mechanisms of type I, II and III and obtained extending the SM with RH neutrinos [39][40][41][42][43], a scalar triplet [44][45][46][47][48][49] and vector-like fermion triplets [50,51], respectively. In order to assert the violation of LN at the LHC it is enough to observe final states with non-zero LN, for the LN of the initial state (pp) vanishes.…”

Section: Introductionmentioning

confidence: 99%

LHC bounds on lepton number violation mediated by doubly and singly-charged scalars

Águila

Chala

2014

J. High Energ. Phys.

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Abstract:The only possible doubly-charged scalar decays into two Standard Model particles are into pairs of same-sign charged leptons, H ±± → l ± l ± , l = e, µ, τ , or gauge bosons, H ±± → W ± W ± ; being necessary the observation of both to assert the violation of lepton number. However, present ATLAS and CMS limits on doubly-charged scalar production are obtained under specific assumptions on its branching fractions into dileptons only. Although they can be extended to include decays into dibosons and lepton number violating processes. Moreover, the production rates also depend on the type of electroweak multiplet H ±± belongs to. We classify the possible alternatives and provide the Feynman rules and codes for generating the corresponding signals for pair and associated doubly-charged scalar production, including the leading contribution from the s-channel exchange of electroweak gauge bosons as well as the vector-boson fusion corrections. Then, using the same analysis criteria as the LHC collaborations we estimate the limits on the H ±± mass as a function of the electroweak multiplet it belongs to, and obtain the bounds on the lepton number violating processes pp → H ±± H ∓∓ → ± ± W ∓ W ∓ and pp → H ±± H ∓ → ± ± W ∓ Z, = e, µ, implied by the ATLAS and CMS doubly-charged scalar searches.

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Left-handed neutrino mass scale and spontaneously broken lepton number

Cited by 1,129 publications

References 8 publications

A study of invisible neutrino decay at DUNE and its effects on θ23 measurement

A study of invisible neutrino decay at DUNE and its effects on θ23 measurement

Testing neutrino properties at long baseline experiments and neutrino factories

LHC bounds on lepton number violation mediated by doubly and singly-charged scalars

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