Decoherence, matter effect, and neutrino hierarchy signature in long baseline experiments

Coelho, J. A. B.; Mann, W. A.

doi:10.1103/physrevd.96.093009

Cited by 29 publications

(31 citation statements)

References 42 publications

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“…refs. [16,18,19]. In this work we will show that the reference value for γ 23 considered in [17] is indeed already excluded by IceCube data (we note however that, according to the latest results reported by NOvA, the significance of the tension has been reduced to less than 1σ [3]).…”

Section: Introductionmentioning

confidence: 51%

“…In this work we study one of the possible windows to NP, the so-called quantum decoherence in neutrino oscillations, and update the existing bounds by analyzing IceCube and DeepCore data on atmospheric neutrinos. In particular, we are interested in a kind of decoherence effects in neutrino oscillations studied, for example, in [6][7][8][9][10][11][12][13] and, more recently, in [14][15][16][17][18][19]. These decoherence effects differ from the standard decoherence caused by the separation of wave packets (see e.g.…”

Section: Introductionmentioning

confidence: 99%

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Decoherence in neutrino propagation through matter, and bounds from IceCube/DeepCore

et al. 2018

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We revisit neutrino oscillations in matter considering the open quantum system framework, which allows to introduce possible decoherence effects generated by New Physics in a phenomenological manner. We assume that the decoherence parameters γ i j may depend on the neutrino energy, asThe case of non-uniform matter is studied in detail and, in particular, we develop a consistent formalism to study the nonadiabatic case dividing the matter profile into an arbitrary number of layers of constant densities. This formalism is then applied to explore the sensitivity of IceCube and DeepCore to this type of effects. Our study is the first atmospheric neutrino analysis where a consistent treatment of the matter effects in the three-neutrino case is performed in presence of decoherence. We show that matter effects are indeed extremely relevant in this context. We find that IceCube is able to considerably improve over current bounds in the solar sector (γ 21 ) and in the atmospheric sector (γ 31 and γ 32 ) for n = 0, 1, 2 and, in particular, by several orders of magnitude (between 3 and 9) for the n = 1, 2 cases. For n = 0 we find γ 32 , γ 31 < 4.0 × 10 −24 (1.3 × 10 −24 ) GeV and γ 21 < 1.3 × 10 −24 (4.1 × 10 −24 ) GeV at the 95% CL, for normal (inverted) mass ordering.

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Section: Introductionmentioning

confidence: 51%

Section: Introductionmentioning

confidence: 99%

Decoherence in neutrino propagation through matter, and bounds from IceCube/DeepCore

et al. 2018

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“…In this section we are going to show sensitivity analyses considering neutrino oscillations with decoherence in matter given by Eq. (14). We first show how each oscillation channel is sensible to decoherence by calculating the event rates, and then we establish DUNE sensitivities to the decoherence parameters.…”

Section: Resultsmentioning

confidence: 99%

Quantum decoherence effects in neutrino oscillations at DUNE

et al. 2019

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In this work we analyze quantum decoherence in neutrino oscillations considering the Open Quantum System framework and oscillations through matter for three neutrino families. Taking DUNE as a case study we performed sensitivity analyses for two neutrino flux configurations finding limits for the decoherence parameters. We also offer a physical interpretation for a new peak which arises at the νe appearance probability with decoherence. The sensitivity limits found for the decoherence parameters are Γ21 ≤ 1.2 × 10 −23 GeV and Γ32 ≤ 7.7 × 10 −25 GeV at 90% C. L.

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“…Decoherence effects, in the framework of open systems or the Lindblad equation, have been considered in the recent neutrino physics literature in a variety of contexts [10][11][12][13][14], and in specific settings such as IceCube [15], DUNE [16], and long base line experiments [17,18]. It has also been considered for their possible relevance in connection with quantum gravitational effects [19], and the question of CPT symmetry and the Dirac vs Majorana nature of neutrinos [20,21].…”

Section: Introductionmentioning

confidence: 99%

Neutrino decoherence in an electron and nucleon background

Nieves

Sahu

2020

Phys. Rev. D

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We consider the decoherence effects in the propagation of active neutrinos due to the nonforward neutrino scattering processes in a matter background composed of electrons and nucleons. We calculate the contribution to the imaginary part of the neutrino self-energy arising from such processes. Since the initial neutrino state is depleted but does not actually disappear (the initial neutrino transitions into a neutrino of a different flavor but does not decay) those processes should be associated with decoherence effects that cannot be described in terms of the coherent evolution of the state vector. Based on the formalism developed in our previous work for treating the nonforward scattering processes using the notion of the stochastic evolution of the state, we identify the jump operators, as used in the context of the master or Lindblad equation, in terms of the results of the calculation of the nonforward neutrino scattering contribution to the imaginary part of the neutrino self-energy. As a guide to estimating the decoherence effects in situations of practical interest we give explicit formulas for the decoherence terms for different background conditions, and point out some of the salient features in particular the neutrino energy dependence. To establish contact with previous works in which the decoherence terms are treated as phenomenological parameters, we consider the solution to the evolution equation in the two-generation case. We give formulas that are useful for estimating the effects of the decoherence terms under various conditions and environments, including the typical conditions applicable to long baseline experiments, where matter effects are important. In those contexts the effects appear to be small, and indicative that if significant decoherence effects were to be found they would be due to nonstandard contributions to the decoherence terms.

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Decoherence, matter effect, and neutrino hierarchy signature in long baseline experiments

Cited by 29 publications

References 42 publications

Decoherence in neutrino propagation through matter, and bounds from IceCube/DeepCore

Decoherence in neutrino propagation through matter, and bounds from IceCube/DeepCore

Quantum decoherence effects in neutrino oscillations at DUNE

Neutrino decoherence in an electron and nucleon background

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