Another look at the impact of an eV-mass sterile neutrino on the effective neutrino mass of neutrinoless double-beta decays

Liu, Junhao; Zhou, Shun

doi:10.1142/s0217751x18500148

Cited by 14 publications

(9 citation statements)

References 37 publications

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“…It is obvious that m e ≥ m e always holds, but it is difficult to compare between the magnitudes of m ee and m ee because the CP-violating phases are likely to cause significant cancellations among their respective components. The extreme case is either m ee → 0 [354,355,356] or m ee → 0 [674,675,676] (see section 7.2.1 for a detailed discussion about the parameter space of m ee → 0).…”

Section: Some Possible Phenomenological Consequencesmentioning

confidence: 99%

Flavor structures of charged fermions and massive neutrinos

Xing

2019

Preprint

116

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Most of the free parameters in the Standard Model (SM) -a quantum field theory which has successfully elucidated the behaviors of strong, weak and electromagnetic interactions of all the known fundamental particles, come from the lepton and quark flavors. The discovery of neutrino oscillations has proved that the SM is incomplete, at least in its lepton sector; and thus the door of opportunity is opened to exploring new physics beyond the SM and solving a number of flavor puzzles. In this review article we give an overview of important progress made in understanding the mass spectra, flavor mixing patterns, CP-violating effects and underlying flavor structures of charged leptons, neutrinos and quarks in the past twenty years. After introducing the standard pictures of fermion mass generation, flavor mixing and CP violation in the SM extended with the presence of massive Dirac or Majorana neutrinos, we briefly summarize current experimental knowledge about the flavor parameters of quarks and leptons. Various ways of describing flavor mixing and CP violation are discussed, the renormalization-group evolution of flavor parameters is illuminated, and the matter effects on neutrino oscillations are interpreted. Taking account of possible extra neutrino species, we propose a standard parametrization of the 6 × 6 flavor mixing matrix and comment on the phenomenological aspects of heavy, keV-scale and light sterile neutrinos. We pay particular attention to those novel and essentially model-independent ideas or approaches regarding how to determine the Yukawa textures of Dirac fermions and the effective mass matrix of Majorana neutrinos, including simple discrete and continuous flavor symmetries. An outlook to the future development in unravelling the mysteries of flavor structures is also given.

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Section: Some Possible Phenomenological Consequencesmentioning

confidence: 99%

Flavor structures of charged fermions and massive neutrinos

Xing

2019

Preprint

116

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“…Although the impact of an eV-mass sterile neutrino on the effective neutrino mass |m ee | has been considered in Refs. [39][40][41][42][43][44][45][46][47], a statistical assessment is still lacking. Therefore, we are motivated to perform a Bayesian analysis of |m ee | in this work by using the global-fit results of neutrino oscillation data and other available information on the absolute neutrino masses.…”

Section: Introductionmentioning

confidence: 99%

Impact of an eV-mass sterile neutrino on the neutrinoless double-beta decays: A Bayesian analysis

Huang

Zhou

2019

Nuclear Physics B

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To quantitatively assess the impact of an eV-mass sterile neutrino on the neutrinoless double-beta (0νββ) decays, we calculate the posterior probability distribution of the relevant effective neutrino mass |m ee | in the (3+1)ν mixing scenario, following the Bayesian statistical approach. The latest global-fit analysis of neutrino oscillation data, the cosmological bound on the sum of three active neutrino masses from Planck, and the constraints from current 0νββ decay experiments are taken into account in our calculations. Based on the resultant posterior distributions, we find that the average value of the effective neutrino mass is shifted from |m ee | = 3.37×10 −3 eV (or 7.71×10 −3 eV) in the standard 3ν mixing scenario to |m ee | = 2.54 × 10 −2 eV (or 2.56 × 10 −2 eV) in the (3+1)ν mixing scenario, with the logarithmically uniform prior on the lightest neutrino mass (or on the sum of three active neutrino masses). Therefore, a null signal from the future 0νββ decay experiment with a sensitivity to |m ee | ≈ O(10 −2 ) eV will be able to set a very stringent constraint on the sterile neutrino mass and the active-sterile mixing angle. *

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“…where the phenomenon on m eff is very different from the degenerated case, but similar as the case with one sterile neutrino [81][82][83][84][85].…”

Section: Theoretical Frameworkmentioning

confidence: 99%

Neutrinoless double beta decay in the minimal type-I seesaw model: How the enhancement or cancellation happens?

Fang,

Li,

Zhang

2021

Preprint

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We discuss the contribution of right-handed neutrinos (RHNs) to the effective neutrino mass of the neutrinoless double beta decay within the minimal type-I seesaw model using the intrinsic seesaw relation of neutrino mass and mixing parameters and the relative mass dependence of the nuclear matrix elements. In the viable parameter space, we find the possibilities of both the enhancement and cancellation to the effective neutrino mass from RHNs. The bounds on the parameter space of the RHNs can be determined with the effective neutrino mass extracted from neutrinoless double beta decay experiments. I. INTRODUCTIONThe observation of neutrino oscillations from the atmospheric [1], solar [2][3][4], reactor [5-8] and accelerator [9][10][11] neutrinos is one of the most important discoveries in particle physics, which indicates that neutrinos are massive, and is currently the only evidence for physics beyond the Standard Model (SM). But neutrino oscillation experiments do not allow us to determine the absolute neutrino mass scale, as well as the origin of neutrino masses. To determine the absolute neutrino mass scale, three complementary methods can be used. The first one is the cosmological observation, which probe the direct sum of three neutrino masses [12][13][14][15]. The second one is the β-decay experiments, such as the KATRIN experiment, which gives the limit on the effective neutrino mass from the spectral fine structure near the β-decay endpoint [16][17][18]. The third is the neutrinoless double beta decay (i.e., 0νββ) experiments [19-25] that we will discuss in this work, for recent reviews see Ref. [26][27][28].Neutrino masses are several orders of magnitude smaller than the masses of charged leptons and quarks, and may not be (or not only) of the SM Higgs origin. Therefore, alternative new mechanisms of the neutrino mass generation have been proposed, of which the most plausible one is the type-I seesaw mechanism [29][30][31][32]. According to this mechanism, the small neutrino masses are generated by a new interaction with new Higgs particles beyond SM, which violates the total lepton number at a mass scale much heavier than the electroweak interaction. Within such mechanism, the neutrinos are Majorana particles, and consequently, this leads to the above mentioned lepton number violating (LNV) 0νββ-decay process. The nature of neutrinos, that is whether the neutrino mass is of the Majorana or Dirac type, is important for our understanding of the origin for small neutrino masses. With the neutrino Majorana nature, more phases (namely the Majorana phases) will be included in the neutrino mixing matrix [33]. Neither results from neutrino oscillation experiments, cosmology probes, nor that from β-decay experiments depends on the Majorana phases. However, from the effective neutrino mass (m eff ) of the 0νββ decay, such information could be extracted [34][35][36][37][38].So far, the 0νββ-decay hasn't been detected yet and the lower bounds of the decay half-lives for various isotopes are obtained from different...

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Another look at the impact of an eV-mass sterile neutrino on the effective neutrino mass of neutrinoless double-beta decays

Cited by 14 publications

References 37 publications

Flavor structures of charged fermions and massive neutrinos

Flavor structures of charged fermions and massive neutrinos

Impact of an eV-mass sterile neutrino on the neutrinoless double-beta decays: A Bayesian analysis

Neutrinoless double beta decay in the minimal type-I seesaw model: How the enhancement or cancellation happens?

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