Neutrino decay and solar neutrino seasonal effect

Picoreti, Renan; Guzzo, M. M.; Holanda, P. C. de; Peres, O. L. G.

doi:10.1016/j.physletb.2016.08.007

Cited by 61 publications

(67 citation statements)

References 22 publications

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“…For the invisible neutrino decay, the best bound from oscillation experiments on the ν 2 lifetime comes from the combination of solar and reactor data and corresponds to approximately τ 2 /m 2 > 2 × 10 −3 s/eV at 90% C.L. [29]. See also Ref.…”

Section: Introductionmentioning

confidence: 99%

Constraining the invisible neutrino decay with KM3NeT-ORCA

et al. 2019

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Several theories of particle physics beyond the Standard Model consider that neutrinos can decay. In this work we assume that the standard mechanism of neutrino oscillations is altered by the decay of the heaviest neutrino mass state into a sterile neutrino and, depending on the model, a scalar or a Majoron. We study the sensitivity of the forthcoming KM3NeT-ORCA experiment to this scenario and find that it could improve the current bounds coming from oscillation experiments, where three-neutrino oscillations have been considered, by roughly two orders of magnitude. We also study how the presence of this neutrino decay can affect the determination of the atmospheric oscillation parameters sin 2 θ 23 and ∆m 2 31 , as well as the sensitivity to the neutrino mass ordering.the CP phase δ. These parameters have been measured in solar, reactor, atmospheric and long-baseline accelerator neutrino oscillation experiments. The level of precision reached by current experiments is such that, from the global picture [1-5], neutrino oscillation physics is entering the precision era. However, there are still some unknowns to be established: 1. The true ordering of neutrino masses: we still do not know if the order of the neutrino mass spectrum is normal (NO), where m 3 is the heaviest mass state, or inverted (IO), where m 2 is the heaviest one. Recent oscillation results show a preference for NO [1, 2], although the real neutrino mass ordering is not fully determined yet [6]. 2. The octant of the atmospheric angle: the measured value of sin 2 θ 23 is close to maximal (0.5), but it can be either smaller (lower octant) or larger (upper octant). 3. The exact value of the CP phase δ: values of δ ≈ 0.5π are now highly disfavored, but still a large part of the parameter space remains allowed. At 2σ confidence level, CP might be maximally violated, but also conserved. 4. The absolute scale of neutrino masses: so far there are only upper bounds on it, coming from beta decay experiments and cosmological measurements [7]. 5. The nature of neutrinos: are they Dirac or Majorana particles? In the latter case, there are two extra CP phases to be determined, which are only accessible through neutrinoless double beta decay experiments (see e.g. [8]).The last two points can not be determined by neutrino oscillation experiments, since flavor oscillations are insensitive to the absolute neutrino masses and to the Majorana CP phases. Conversely, the three first issues are expected to be solved by the future long-baseline experiment DUNE, which will measure very well the mass ordering [9] as well as the value of the CPviolating phase and the octant of the atmospheric mixing angle [10] within the standard three-neutrino picture. The determination of the mass ordering of neutrinos is also one of the main physics goals of the future atmospheric experiment ORCA (Oscillation Research with Cosmics in the Abyss) [11], that will provide precise measurements of the atmospheric parameters too. ORCA will be basically an updated version of the ANTARES neutrino...

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Section: Introductionmentioning

confidence: 99%

Constraining the invisible neutrino decay with KM3NeT-ORCA

et al. 2019

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“…Neutrino decay as a solution to the solar neutrino deficit problem was suggested in [17], however, now we know that neutrino decay alone cannot explain this deficit. Attempts to constrain the neutrino lifetime by considering neutrino decay as a subdominant effect along with the leading LMA-MSW solution was done in [18][19][20][21][22][23][24][25][26]. Most of these studies considered the invisible decay scenario.…”

Section: Introductionmentioning

confidence: 99%

“…for a 3 parameter fit. This bound was revisited in [25] (see also [26]) where the authors obtained the 95% C.L. limit τ 2 /m 2 > 7 × 10 −4 s/eV for both normal and inverted mass hierarchy and τ 1 /m 1 > 4 × 10 −3 s/eV for inverted mass hierarchy.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity to neutrino decay with atmospheric neutrinos at the INO-ICAL detector

et al. 2018

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Sensitivity of the magnetised Iron CALorimeter (ICAL) detector at the proposed India-based Neutrino Observatory (INO) to invisible decay of the mass eigenstate ν 3 using atmospheric neutrinos is explored. A full three-generation analysis including earth matter effects is performed in a framework with both decay and oscillations. The wide energy range and baselines offered by atmospheric neutrinos are shown to be excellent for constraining the ν 3 lifetime. We find that with an exposure of 500 kton-yr the ICAL atmospheric experiment could constrain the ν 3 lifetime to τ 3 /m 3 > 1.51 × 10 −10 s/eV at the 90% C.L. This is two orders of magnitude tighter than the bound from MINOS. The effect of invisible decay on the precision measurement of θ 23 and |∆m 2

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“…• For solar neutrinos, the studies in [60,61] have constrained the lifetime of ν 2 , giving τ 2 /m 2 ≥ 7.2 × 10 −4 s · eV −1 at 99% C.L., equivalent to α 2 < 9.1 × 10 −13 eV 2 .…”

Section: Introductionmentioning

confidence: 99%

Visible neutrino decay in the light of appearance and disappearance long-baseline experiments

Gago

Gomes

et al. 2017

J. High Energ. Phys.

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Abstract:We investigate the present constraints from MINOS and T2K experiments for the neutrino decay scenario induced by non-diagonal couplings of Majorons to neutrinos. As novelty, on top of the typical invisible decay prescription, we add the contribution of visible decay, where final products can be observed. This new effect depends on the nature of the neutrino-Majoron coupling, which can be of scalar or pseudoscalar type. Using the combination of disappearance data from MINOS and disappearance and appearance data from T2K, for normal ordering, we constrain the decay parameter α ≡ E Γ for the heaviest neutrino, where E and Γ are the neutrino energy and width, respectively. We find that when considering visible decay within appearance data, one can improve current neutrino long-baseline constraints up to α < O(10 −5 ) eV 2 , at 90% C.L., for both kinds of couplings, which is better by one order of magnitude compared to previous bounds.

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Neutrino decay and solar neutrino seasonal effect

Cited by 61 publications

References 22 publications

Constraining the invisible neutrino decay with KM3NeT-ORCA

Constraining the invisible neutrino decay with KM3NeT-ORCA

Sensitivity to neutrino decay with atmospheric neutrinos at the INO-ICAL detector

Visible neutrino decay in the light of appearance and disappearance long-baseline experiments

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