Exploring invisible neutrino decay at ESSnuSB

Choubey, Sandhya; Ghosh, Monojit; Kempe, Daniel; Ohlsson, Tommy

doi:10.1007/jhep05(2021)133

Cited by 19 publications

(8 citation statements)

References 40 publications

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“…Note Added: While this work was being written a paper [70] came on arXiv, which also considered neutrino decay in the context of ESSνSB experiment. Our study contains a comparative analysis of T2HK, T2HKK and ESSνSB experiment.…”

Section: Discussionmentioning

confidence: 99%

Invisible neutrino decay : First vs second oscillation maximum

Chakraborty,

Dutta,

Goswami

et al. 2020

Preprint

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We study the physics potential of the long-baseline experiments T2HK, T2HKK and ESSνSB in the context of invisible neutrino decay. We consider normal mass ordering and assume that the state ν 3 as unstable, decaying into sterile states during the flight and obtain constraints on the neutrino decay lifetime (τ 3 ). We find that T2HK, T2HKK and ESSνSB are sensitive to the decay-rate of ν 3 for τ 3 /m 3 ≤ 2.72 × 10 −11 s/eV, τ 3 /m 3 ≤ 4.36 × 10 −11 s/eV and τ 3 /m 3 ≤ 2.43 × 10 −11 s/eV respectively at 3σ C.L. We compare and contrast the sensitivities of the three experiments and specially investigate the role played by the mixing angle θ 23 . It is seen that for experiments with flux peak near the second oscillation maxima, the poorer sensitivity to θ 23 results in weaker constraints on the decay lifetime. Although, T2HKK has one detector close to the second oscillation maxima, having another detector at the first oscillation maxima results in superior sensitivity to decay. In addition, we find a synergy between the two baselines of the T2HKK experiment which helps in giving a better sensitivity for θ 23 in the higher octant. We discuss the octant sensitivity in presence of decay and show that there is an enhancement in sensitivity which occurs due to the contribution from the survival probability P µµ which is more pronounced for the experiments at the second oscillation maxima. We also obtain the combined sensitivity of T2HK+ESSνSB and T2HKK+ESSνSB as τ 3 /m 3 ≤ 4.36 × 10 −11 s/eV and τ 3 /m 3 ≤ 5.53 × 10 −11 s/eV respectively at 3σ C.L.

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Section: Discussionmentioning

confidence: 99%

Invisible neutrino decay : First vs second oscillation maximum

Chakraborty,

Dutta,

Goswami

et al. 2020

Preprint

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“…Neutrino decay (invisible and visible) has been probed in a wide range of experiments. Constraints, sensitivity estimates, and degeneracies have been studied in atmospheric and long-baseline accelerator and reactor experiments finding τ 3 /m 3 10 −10 s eV −1 [168][169][170][171][172][173][174][175][176][177][178][179][180][181][182], the solar sector finding τ 1,2 /m 1,2 10 −3 s eV −1 [183][184][185][186][187], high energy astrophysical neutrinos at IceCube finding τ i /m i 10 1 s eV −1 [188][189][190][191][192][193][194], galactic supernova finding τ /m 10 5 s eV −1 [195,196], the diffuse supernova neutrino background with an estimated sensitivity of τ i /m i ∼ 10 10 s eV −1 [197,198], and the cosmic neutrino background with an estimated sensitivity of τ i /m i ∼ 10 15 s eV −1 [199]. Additionally, measurements of the CMB constrain neutrino decay in a somewhat model dependent fashion to be τ i /m i 10 11 s eV −1 [200][201][202][203] although these bounds may be relaxed by an additional 3-4 orders of magnitude in a separate analysis [204].…”

Section: Neutrino Decaymentioning

confidence: 99%

Tau neutrinos in the next decade: from GeV to EeV

Abraham

Álvarez-Muñiz

Argüelles

et al. 2022

J. Phys. G: Nucl. Part. Phys.

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“…No observation of this phenomenon has been obtained so far, and the best current limits come from combined data analyses such as T2K and NOνA [14], MINOS and T2K [15] and K2K, MINOS and SK [16]. Sensitivity studies have been carried out also for future accelerator experiments, like DUNE [17], MOMENT [18] and ESSnuSB [19], reactor experiments like JUNO [20], and atmospheric neutrino experiments such as INO [21].…”

Section: Introductionmentioning

confidence: 99%

Determining the neutrino mass ordering and oscillation parameters with KM3NeT/ORCA

Aiello¹,

Albert²,

Garre³

et al. 2022

Eur. Phys. J. C

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The next generation of water Cherenkov neutrino telescopes in the Mediterranean Sea are under construction offshore France (KM3NeT/ORCA) and Sicily (KM3NeT/ARCA). The KM3NeT/ORCA detector features an energy detection threshold which allows to collect atmospheric neutrinos to study flavour oscillation. This paper reports the KM3NeT/ORCA sensitivity to this phenomenon. The event reconstruction, selection and classification are described. The sensitivity to determine the neutrino mass ordering was evaluated and found to be 4.4$$\sigma $$ σ if the true ordering is normal and 2.3$$\sigma $$ σ if inverted, after 3 years of data taking. The precision to measure $$\varDelta m^2_{32}$$ Δ m 32 2 and $$\theta _{23}$$ θ 23 were also estimated and found to be $$85 . 10^{-6}~{\mathrm{eV}^{2}}$$ 85 . 10 - 6 eV 2 and $$(^{+1.9}_{-3.1})^{\circ }$$ ( - 3.1 + 1.9 ) ∘ for normal neutrino mass ordering and, $$75 . 10^{-6}~{\mathrm{eV}^{2}}$$ 75 . 10 - 6 eV 2 and $$(^{+2.0}_{-7.0})^{\circ }$$ ( - 7.0 + 2.0 ) ∘ for inverted ordering. Finally, a unitarity test of the leptonic mixing matrix by measuring the rate of tau neutrinos is described. Three years of data taking were found to be sufficient to exclude "Equation missing" event rate variations larger than 20% at $$3\sigma $$ 3 σ level.

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Exploring invisible neutrino decay at ESSnuSB

Cited by 19 publications

References 40 publications

Invisible neutrino decay : First vs second oscillation maximum

Invisible neutrino decay : First vs second oscillation maximum

Tau neutrinos in the next decade: from GeV to EeV

Determining the neutrino mass ordering and oscillation parameters with KM3NeT/ORCA

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