Determining the neutrino mass hierarchy and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi></mml:math>-violation in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>NO</mml:mi><mml:mi>ν</mml:mi><mml:mi mathvariant="normal">A</mml:mi></mml:math>with a second off-axis detector

Mena, Olga; Palomares‐Ruiz, Sergio; Pascoli, Silvia

doi:10.1103/physrevd.73.073007

Cited by 34 publications

(33 citation statements)

References 137 publications

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“…Specifically, our setup performs better than a pure neutrino running option in combination with a short baseline detector, such as considered in Refs. [44,45]. We also checked that the medium energy beam option does not provide better sensitivities and would not significantly alter our conclusions.…”

Section: Risk Minimizationmentioning

confidence: 99%

“…Since longer baselines may not be possible with a detector within the U.S., a larger off-axis angle of 2.4 • combined with a short baseline L ≃ 200 km, called "Super-NOνA", was suggested in Refs. [44,45]. In this section, we investigate the issue of site optimization using a liquid argon detector as a second detector.…”

Section: Noνa*: a New Experiments Based On The Numi Beam Linementioning

confidence: 99%

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Which long-baseline neutrino experiments are preferable?

2007

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We discuss the physics of superbeam upgrades, where we focus on T2KK, a NuMI beam line based experiment NOνA*, and a wide band beam (WBB) experiment independent of the NuMI beam line. For T2KK, we find that the Japan-Korea baseline helps resolve parameter degeneracies, but the improvement due to correlated systematics between the two detectors (using identical detectors) is only moderate. For an upgrade of NOνA with a liquid argon detector, we demonstrate that the Ash River site is preferred compared to alternatives, such as at the second oscillation maximum, and is the optimal site within the U.S. For a WBB experiment, we find that high proton energies and long decay tunnels are preferable. We compare water Cherenkov and liquid argon technologies, and find the break-even point in detector cost at about 4:1. In order to compare the physics potential of the different experimental configurations, we use the concept of exposure to normalize the performance. We find that experiments with WBBs are the best experimental concept. NOνA* could be competitive with sufficient luminosity. If sin 2 2θ 13 > 0.01, a WBB experiment can perform better than a neutrino factory.

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Section: Risk Minimizationmentioning

confidence: 99%

Section: Noνa*: a New Experiments Based On The Numi Beam Linementioning

confidence: 99%

Which long-baseline neutrino experiments are preferable?

2007

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“…Oscillation phenomenology invokes a unitary matrix that relates the flavor basis, in which the neutrinos are created or destroyed, to the mass basis, in which the neutrinos propagate through vacuum. This matrix can be written in terms of three real mixing angles, θ 12 , θ 23 , and θ 13 , and a phase δ that determines CP violation. Oscillations also require nonzero neutrino mass differences, being dependent upon the difference of the square of the masses, ∆ ij := m 2 i − m 2 j with m i the mass of neutrino i.…”

mentioning

confidence: 99%

“…The situation, however, is confounded by the existence of various degeneracies amongst the parameters [14,15] which can render ambiguous their extraction from experiments. To break the degeneracies, one needs to combine the results of experiments, e.g., superbeams, operating at different energies and/or baselines [14,[16][17][18][19][20][21][22][23][24][25][26][27]. In the near future, the T2K [28] and NOνA [29] experiments may be able to determine the hierarchy [30][31][32][33].…”

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Impact of hierarchy upon the values of neutrino mixing parameters

Escamilla-Roa¹,

Latimer²,

Ernst³

2010

Phys. Rev. C

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A neutrino-oscillation analysis is performed of the more finely binned Super-K atmospheric, MI-NOS, and CHOOZ data in order to examine the impact of neutrino hierarchy in this data set upon the value of θ13 and the deviation of θ23 from maximal mixing. Exact oscillation probabilities are used, thus incorporating all powers of θ13 and ε := θ23 − π/4. The extracted oscillation parameters are found to be dependent on the hierarchy, particularly for θ13. We find at 90% CL are ∆32 = 2.44 +0.26 −0.20 and 2.48 +0.25 −0.22 × 10 −3 eV 2 , ε = θ23 − π/4 = 0.06 +0.06 −0.16 and 0.06 +0.08 −0.17 , and θ13 = −0.07 +0.18 −0.11 and −0.13 +0.23 −0.16 , for the normal and inverted hierarchy respectively. The inverted hierarchy is preferred at a statistically insignificant level of 0.3 σ.PACS numbers: 14.60.Pq Keywords: neutrino oscillations, three neutrinos, mixing angles, mass-squared differences, mass hierarchyThe field of neutrino oscillations has progressed rapidly over the past fifteen years. The data can largely be understood by the oscillation of the three known neutrinos [1, 2]. Oscillation phenomenology invokes a unitary matrix that relates the flavor basis, in which the neutrinos are created or destroyed, to the mass basis, in which the neutrinos propagate through vacuum. This matrix can be written in terms of three real mixing angles, θ 12 , θ 23 , and θ 13 , and a phase δ that determines CP violation. Oscillations also require nonzero neutrino mass differences, being dependent upon the difference of the square of the masses, ∆ ij := m 2 i − m 2 j with m i the mass of neutrino i. A recent analysis [3] reports the present knowledge of the values of the oscillation parameters. In particular, we note that only an upper limit exists on the size of the "reactor" mixing angle |θ 13 | = 0.19 +0.12 −0.19 (1σ), a constraint which arises, in part, from the null oscillation result of the CHOOZ experiment [4]. A nonzero value of θ 13 is requisite for the existence of CP violation in neutrino oscillations; hence, we presently have no knowledge of the value of δ. We also have no knowledge of the ordering of the neutrino mass eigenstate; namely, is m 3 greater or less than m 1 and m 2 ? The former (latter) situation is termed the normal (inverted) hierarchy.Recently, hints of nonzero θ 13 have been reported as a means by which to ease the tension between the determination of the oscillation parameters θ 12 and ∆ 21 by the solar and KamLAND experiments [5,6]. At a smaller significance, analyses of atmospheric data also hint at nonzero θ 13 [7,8], though one study shows that the significance of the results are dependent upon the precise nature of the statistical analysis [9]. Furthermore, an analysis of the updated atmospheric data finds no preference for nonzero θ 13 [10]; however, this analysis employs approximate oscillation formulae and cannot be directly compared to these other works. Should these various hints be cleanly confirmed in current neutrino oscillation experiments [11-13], then one might be able to attack the issue of C...

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Probing CP violation with T2K, NOνA and DUNE in the presence of non-unitarity

Dutta

Ghoshal

2016

J. High Energ. Phys.

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Abstract:The presence of non-unitary neutrino mixing can affect the measurement of the three-neutrino leptonic Dirac CP phase and hamper efforts to probe CP violation due to degeneracies of the extra non-unitary CP phase with the standard CP phase. We study the effect of including non-unitarity on probing CP violation with the long-baseline experiments NOνA, T2K and DUNE. We analyze the effect of non-unitary mixing at the level of oscillation probabilities associated with the relevant baselines, and present the CP violation sensitivity for the individual experiments and their combination. Our results show that there is an improvement in the CP violation sensitivity of the combination compared to the individual experiments.

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Determining the neutrino mass hierarchy andCP-violation inNOνAwith a second off-axis detector

Cited by 34 publications

References 137 publications

Which long-baseline neutrino experiments are preferable?

Which long-baseline neutrino experiments are preferable?

Impact of hierarchy upon the values of neutrino mixing parameters

Probing CP violation with T2K, NOνA and DUNE in the presence of non-unitarity

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