Shedding light on LMA-dark solar neutrino solution by medium baseline reactor experiments: JUNO and RENO-50

Bakhti, Pouya; Farzan, Yasaman

doi:10.1007/jhep07(2014)064

Cited by 58 publications

(60 citation statements)

References 59 publications

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“…However, in the presence of NSI, the symmetry can be restored if in addition to the transformation Eq. (4), NSI parameters are transformed as [8][9][10] …”

Section: Arxiv:170802899v1 [Hep-ph] 9 Aug 2017mentioning

confidence: 99%

“…This was first observed in the context of solar neutrinos, where for suitable NSI the data can be explained by a mixing angle θ 12 in the second octant, the so-called LMA-Dark (LMA-D) [5] solution. This is in sharp contrast to the established standard MSW solution [2,6], which requires a mixing angle θ 12 in the first octant.The origin of the LMA-D solution is a degeneracy in oscillation probabilities due to a symmetry of the Hamiltonian describing neutrino evolution in the presence of NSI [7][8][9][10]. This degeneracy involves not only the octant of θ 12 but also a change in sign of the larger neutrino mass-squared difference, ∆m 2 31 , which is used to parameterize the type of neutrino mass ordering (normal versus inverted).…”

mentioning

confidence: 99%

“…The origin of the LMA-D solution is a degeneracy in oscillation probabilities due to a symmetry of the Hamiltonian describing neutrino evolution in the presence of NSI [7][8][9][10]. This degeneracy involves not only the octant of θ 12 but also a change in sign of the larger neutrino mass-squared difference, ∆m 2 31 , which is used to parameterize the type of neutrino mass ordering (normal versus inverted).…”

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confidence: 99%

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COHERENT enlightenment of the neutrino dark side

et al. 2017

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In the presence of non-standard neutrino interactions (NSI), oscillation data are affected by a degeneracy which allows the solar mixing angle to be in the second octant (aka the dark side) and implies a sign flip of the atmospheric mass-squared difference. This leads to an ambiguity in the determination of the ordering of neutrino masses, one of the main goals of the current and future experimental neutrino program. We show that the recent observation of coherent neutrino-nucleus scattering by the COHERENT experiment, in combination with global oscillation data, excludes the NSI degeneracy at the 3.1σ (3.6σ) CL for NSI with up (down) quarks.The standard three-flavour oscillation scenario is supported by a large amount of data from neutrino oscillation experiments. The determination of oscillation parameters (see, e.g., Ref.[1]) is very robust, and for a broad range of new physics scenarios only small perturbations of the standard oscillation picture are allowed by data. There is, however, an exception to this statement: in the presence of non-standard neutrino interactions (NSI) [2-4] a degeneracy exists in oscillation data, leading to a qualitative change of the lepton mixing pattern. This was first observed in the context of solar neutrinos, where for suitable NSI the data can be explained by a mixing angle θ 12 in the second octant, the so-called LMA-Dark (LMA-D) [5] solution. This is in sharp contrast to the established standard MSW solution [2,6], which requires a mixing angle θ 12 in the first octant.The origin of the LMA-D solution is a degeneracy in oscillation probabilities due to a symmetry of the Hamiltonian describing neutrino evolution in the presence of NSI [7][8][9][10]. This degeneracy involves not only the octant of θ 12 but also a change in sign of the larger neutrino mass-squared difference, ∆m 2 31 , which is used to parameterize the type of neutrino mass ordering (normal versus inverted). Hence, the LMA-D degeneracy makes it impossible to determine the neutrino mass ordering by oscillation experiments [10], and therefore jeopardizes one of the main goals of the upcoming neutrino oscillation program. As discussed in Refs. [5,[10][11][12], non-oscillation data (such as that from neutrino scattering experiments) is needed to break this degeneracy.Recently, coherent neutrino-nucleus scattering has been observed for the first time by the COHERENT experiment [13], using neutrinos produced at the Spallation Neutron Source (SNS) in Oak Ridge National Laboratory. The observed interaction rate is in good agreement with the Standard Model (SM) prediction and can be used to constrain NSI. In this Letter we show that this result excludes the LMA-D solution at 3.1σ (3.6σ) CL for NSI with up (down) quarks when combined with oscillation data.NSI formalism and the LMA-D degeneracy. We consider the presence of neutral-current (NC) NSI in the form of dimension-six four-fermion operators, following the notation of Ref. [8]. Since we are interested in the contribution of the NSI to the effective potential of ne...

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“…However, in the presence of NSI, the symmetry can be restored if in addition to the transformation Eq. (4), NSI parameters are transformed as [8][9][10] …”

Section: Arxiv:170802899v1 [Hep-ph] 9 Aug 2017mentioning

confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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COHERENT enlightenment of the neutrino dark side

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“…This degeneracy at DUNE was first shown in ref. [18], and can be explained by the generalized MH degeneracy [31,44], which states that under the transformation,…”

Section: A Single Nonzero Nsi Parametermentioning

confidence: 99%

Nonstandard neutrino interactions at DUNE, T2HK and T2HKK

Liao

Marfatia

Whisnant

2017

J. High Energ. Phys.

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We study the matter effect caused by nonstandard neutrino interactions (NSI) in the next generation long-baseline neutrino experiments, DUNE, T2HK and T2HKK. If multiple NSI parameters are nonzero, the potential of these experiments to detect CP violation, determine the mass hierarchy and constrain NSI is severely impaired by degeneracies between the NSI parameters and by the generalized mass hierarchy degeneracy. In particular, a cancellation between leading order terms in the appearance channels when eτ = cot θ 23 eµ , strongly affects the sensitivities to these two NSI parameters at T2HK and T2HKK. We also study the dependence of the sensitivities on the true CP phase δ and the true mass hierarchy, and find that overall DUNE has the best sensitivity to the magnitude of the NSI parameters, while T2HKK has the best sensitivity to CP violation whether or not there are NSI. Furthermore, for T2HKK a smaller off-axis angle for the Korean detector is better overall. We find that due to the structure of the leading order terms in the appearance channel probabilities, the NSI sensitivities in a given experiment are similar for both mass hierarchies, modulo the phase change δ → δ + 180 • .

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“…Apart from the standard oscillation picture, the reactor antineutrino experiments could also help us to probe new physics as non-standard effects in neutrino oscillations [26][27][28][29][30][31]. In this work, we will use the existing data of the Daya Bay experiment as well as the sensitivity of the future JUNO experiment to put constraints on sterile neutrinos using scenarios with 3+1 neutrinos [32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Constraining sterile neutrinos using reactor neutrino experiments

Girardi

Meloni

Ohlsson

et al. 2014

J. High Energ. Phys.

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Models of neutrino mixing involving one or more sterile neutrinos have resurrected their importance in the light of recent cosmological data. In this case, reactor antineutrino experiments offer an ideal place to look for signatures of sterile neutrinos due to their impact on neutrino flavor transitions. In this work, we show that the high-precision data of the Daya Bay experiment constrain the 3+1 neutrino scenario imposing upper bounds on the relevant active-sterile mixing angle sin 2 2θ 14 0.06 at 3σ confidence level for the mass-squared difference ∆m 2 41 in the range (10 −3 , 10 −1 ) eV 2 . The latter bound can be improved by six years of running of the JUNO experiment, sin 2 2θ 14 0.016, although in the smaller mass range ∆m 2 41 ∈ (10 −4 , 10 −3 ) eV 2 . We have also investigated the impact of sterile neutrinos on precision measurements of the standard neutrino oscillation parameters θ 13 and ∆m 2 31 (at Daya Bay and JUNO), θ 12 and ∆m 2 21 (at JUNO), and most importantly, the neutrino mass hierarchy (at JUNO). We find that, except for the obvious situation where ∆m 2 41 ∼ ∆m 2 31 , sterile states do not affect these measurements substantially.

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Shedding light on LMA-dark solar neutrino solution by medium baseline reactor experiments: JUNO and RENO-50

Cited by 58 publications

References 59 publications

COHERENT enlightenment of the neutrino dark side

COHERENT enlightenment of the neutrino dark side

Nonstandard neutrino interactions at DUNE, T2HK and T2HKK

Constraining sterile neutrinos using reactor neutrino experiments

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