Wave-packet treatment of reactor neutrino oscillation experiments and its implications on determining the neutrino mass hierarchy

Chan, Yat-Long; Chu, M.; Tsui, K. M.; Wong, C. F.; Xu, J.

doi:10.1140/epjc/s10052-016-4143-4

Cited by 23 publications

(26 citation statements)

References 37 publications

(93 reference statements)

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“…Apart from separating, the wave packets also spread, since they comprise waves with different energies [37,38]. The increase of the size of a packet depends on the absolute values of neutrino masses.…”

Section: Introductionmentioning

confidence: 99%

Decoherence and oscillations of supernova neutrinos

Kersten

Smirnov

2016

Eur. Phys. J. C

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Supernova neutrinos have several exceptional features which can lead to interesting physical consequences. At the production point their wave packets have an extremely small size σ x ∼ 10 −11 cm; hence the energy uncertainty can be as large as the energy itself, σ E ∼ E, and the coherence length is short. On the way to the Earth the wave packets of mass eigenstates spread to macroscopic sizes and separate. Inside the Earth the mass eigenstates split into eigenstates in matter and oscillate again. The coherence length in the Earth is comparable with the radius of the Earth. We explore these features and their consequences. (1) We present new estimates of the wave packet size. (2) We consider the decoherence condition for the case of wave packets with spatial spread and show that it is not modified by the spread. (3) We study the coherence of neutrinos propagating in a multilayer medium with density jumps at the borders of layers. In this case coherence can be partially restored due to a "catchup effect", increasing the coherence length beyond the usual estimate. This catch-up effect can occur for supernova neutrinos as they cross the shock wave fronts in the exploding star or the core of the Earth.

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Section: Introductionmentioning

confidence: 99%

Decoherence and oscillations of supernova neutrinos

Kersten

Smirnov

2016

Eur. Phys. J. C

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“…In this case the reactor neutrino measurement of θ 13 , based on an analysis with no decoherence, is underestimated and the evidence for the normal hierarchy and maximal CP-violation is weakened. Furthermore, the degradation of the signal observed by JUNO would be considerable [3]. This possibility has been rejected by the Daya Bay collaboration [4].…”

Section: Introductionmentioning

confidence: 99%

Entangled neutrino states in a toy model QFT

et al. 2019

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It has been claimed that wave packets must be covariant and also that decohered neutrino oscillations are always revived during measurement. These conjectures are supported by general arguments which are not specific to the electroweak theory, and so if they are true for neutrinos they will also be true for simplified models. In this paper we produce such a simplified model in which the neutrino wave function, including its entanglement with the source particle and the environment, can be calculated explicitly in quantum field theory. It exhibits neutrino oscillation, which is reduced at late times by decoherence due to interactions of the source with the environment. One simple lesson from this model is that only the difference between the environmental interactions before and after neutrino emission can reduce the amplitude of neutrino oscillations. The model will be used to test the conjectures in a companion paper. * jarah@impcas.ac.cn

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“…Various aspects of the QFT approach have been discussed by many authors (see also references in these article), who used rather different methods and approximations, leading to similar (although not always identical) conclusions and sometimes to disputes (see, e.g., [144][145][146]). The experimental activity in the field is still at the very beginning [147], but the reactor experiments (main subject of the present article) have the potential to study the decoherence and dispersion effects predicted by the QFT approach [148][149][150][151].…”

Section: Why Quantum Field Theory?mentioning

confidence: 99%

Reactor Antineutrino Anomaly Reanalysis in Context of Inverse-Square Law Violation

Naumov

Shkirmanov

2021

Universe

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We discuss a possibility that the so-called reactor antineutrino anomaly (RAA), which is a deficit of the ν¯e rates in the reactor experiments in comparison to the theoretical expectations, can at least in part be explained by applying a quantum field-theoretical approach to neutrino oscillations, which in particular predicts a small deviation from the classical inverse-square law at short (but still macroscopic) distances between the neutrino source and detector. An extensive statistical analysis of the current reactor data on the integrated ν¯e event rates vs. baseline is performed to examine this speculation. The obtained results are applied to study another long-standing puzzle—gallium neutrino anomaly (GNA), which is a missing νe flux from 37Ar and 51Cr electron-capture decays as measured by the gallium–germanium solar neutrino detectors GALLEX and SAGE.

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Wave-packet treatment of reactor neutrino oscillation experiments and its implications on determining the neutrino mass hierarchy

Cited by 23 publications

References 37 publications

Decoherence and oscillations of supernova neutrinos

Decoherence and oscillations of supernova neutrinos

Entangled neutrino states in a toy model QFT

Reactor Antineutrino Anomaly Reanalysis in Context of Inverse-Square Law Violation

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