Precision constraints on radiative neutrino decay with CMB spectral distortion

Aalberts, Jelle L.; Ando, Shinʼichiro; Borg, Wouter M.; Broeils, Edwin; Broeils, Jennypher; Broeils, Stephen; Kavanagh, Bradley J.; Leguijt, Gijs; Reemst, Marnix; Arneman, Dylan R. van; Vũ, Hoàng Anh

doi:10.1103/physrevd.98.023001

Cited by 27 publications

(29 citation statements)

References 47 publications

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“…where m j is the mass of ν j . The lower limit on the neutrino lifetime is τ 10 20 s [55,66]. Assuming m j ≈ 0.1 eV and O(1) couplings, we obtain M 0.3 TeV, and up to √ 4π times more stringent constraint if g N is significantly larger than 1, as we have been assuming in this work.…”

Section: Sterile Neutrino Phenomenologysupporting

confidence: 50%

One-loop matching in the SMEFT extended with a sterile neutrino

Chala

Titov

2020

J. High Energ. Phys.

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We study the phenomenology of the simplest renormalisable model that, at low energy, leads to the effective field theory of the Standard Model extended with right-handed neutrinos (νSMEFT). Our aim is twofold. First, to contextualise new collider signatures in models with sterile neutrinos so far studied only using the bottom-up approach. And second and more important, to provide a thorough example of one-loop matching in the diagrammatic approach, of which other matching techniques and automatic tools can benefit for cross-checks. As byproducts of this work, we provide for the first time: (i) a complete off-shell basis for the νSMEFT and explicit relations between operators linked by equations of motion; (ii) a complete basis for the low-energy effective field theory (νLEFT) and the tree-level matching onto the νSMEFT; (iii) partial one-loop anomalous dimensions in the νLEFT. This way, our work comprises a new step forward towards the systematisation of one-loop computations in effective field theories, especially if the SM neutrinos are Dirac.

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Section: Sterile Neutrino Phenomenologysupporting

confidence: 50%

One-loop matching in the SMEFT extended with a sterile neutrino

Chala

Titov

2020

J. High Energ. Phys.

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“…Therefore, it is a good approximation to have the relation P e1 + P e2 + P e3 = 1, as can also be seen from Eq. (19) in Appendix A. The situation is different from Ref.…”

Section: Inverted Mass Orderingmentioning

confidence: 78%

“…The result of dφ 3 /dE can be simply derived from dφ 1 /dE and dφ 2 /dE with the help of the probability conservation in Eq. (19). Dividing the final results by the original flux dφ/dE, we can then obtain those expressions in Eq.…”

Section: Discussionmentioning

confidence: 99%

Constraining neutrino lifetimes and magnetic moments via solar neutrinos in the large xenon detectors

Huang

Zhou

2019

J. Cosmol. Astropart. Phys.

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The multi-ton-scale liquid xenon detectors, with an excellent energy resolution of a few keV, will be constructed to probe the dark-matter particles. In this paper, we show that precision measurements of the low-energy solar neutrinos via the elastic neutrino-electron scattering in this kind of detectors are able to improve the present limits on neutrino lifetimes and neutrino magnetic moments by about one order of magnitude. We carefully study the impact of the unknown neutrino mass spectrum on the ultimate limits in the case of non-radiative visible neutrino decays. In the case of invisible neutrino decays, the lower bounds τ 1 /m 1 3 × 10 −2 s/eV and τ 2 /m 2 8 × 10 −3 s/eV at the 2σ level can be obtained for a total exposure of 70 ton · year. Furthermore, a restrictive constraint on the effective magnetic moment of neutrinos µ eff 2.6 × 10 −12 µ B , with µ B being the Bohr magneton, can be achieved. This is among the best results that will be available in the laboratory experiments in the near future. *

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“…The current limits on the neutrino lifetime are rather weak, except in the case of decays to final states involving photons. In this specific case, the absence of spectral distortions in the cosmic microwave background (CMB) places strong bounds on radiative decays from a heavier neutrino mass eigenstate to a lighter one, τ ν > ∼ 10 19 s for the larger mass splitting and τ ν > ∼ 4 × 10 21 s for the smaller one [36]. There are also very strong, albeit indirect, limits on radiative neutrino decays based on the tight laboratory and astrophysical bounds on the neutrino dipole moment operators that induce this process [37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Cosmological limits on the neutrino mass and lifetime

Chacko

Dev

et al. 2020

J. High Energ. Phys.

117

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At present, the strongest upper limit on m ν , the sum of neutrino masses, is from cosmological measurements. However, this bound assumes that the neutrinos are stable on cosmological timescales, and is not valid if the neutrino lifetime is less than the age of the universe. In this paper, we explore the cosmological signals of theories in which the neutrinos decay into invisible dark radiation on timescales of order the age of the universe, and determine the bound on the sum of neutrino masses in this scenario. We focus on the case in which the neutrinos decay after becoming non-relativistic. We derive the Boltzmann equations that govern the cosmological evolution of density perturbations in the case of unstable neutrinos, and solve them numerically to determine the effects on the matter power spectrum and lensing of the cosmic microwave background. We find that the results admit a simple analytic understanding. We then use these results to perform a Monte Carlo analysis based on the current data to determine the limit on the sum of neutrino masses as a function of the neutrino lifetime. We show that in the case of decaying neutrinos, values of m ν as large as 0.9 eV are still allowed by the data. Our results have important implications for laboratory experiments that have been designed to detect neutrino masses, such as KATRIN and KamLAND-ZEN.

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Precision constraints on radiative neutrino decay with CMB spectral distortion

Cited by 27 publications

References 47 publications

One-loop matching in the SMEFT extended with a sterile neutrino

One-loop matching in the SMEFT extended with a sterile neutrino

Constraining neutrino lifetimes and magnetic moments via solar neutrinos in the large xenon detectors

Cosmological limits on the neutrino mass and lifetime

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