Erratum: Generalized mass ordering degeneracy in neutrino oscillation experiments [Phys. Rev. D 
<b>94</b>
, 055005 (2016)]

Coloma, Pilar; Schwetz, Thomas

doi:10.1103/physrevd.95.079903

Cited by 46 publications

(38 citation statements)

References 19 publications

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“…But in presence of NSI, DUNE loses hierarchy sensitivity due to additional degeneracy creeping in through the NSI parameters. The figure exhibits the ǫ ee → −ǫ ee − 2 degeneracy discussed in [14]. One further observes that, for ǫ ee = −1, the bands for NH-LO(NH-HO) overlap with those of IH-LO(IH-HO) demonstrating the intrinsic nature of the hierarchy degeneracy.…”

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confidence: 80%

“…Note that for δ CP = ±π/2, the third term becomes sin 2 ∆ and there is no hierarchy sensitivity. Note that this is a special case of the ǫ ee → −ǫ ee − 2 and δ CP → π − δ CP degeneracy discussed in [14]. We emphasize on the intrinsic nature of this degeneracy for ǫ ee = −1 3 and δ CP = ±π/2.…”

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confidence: 99%

“…Though additional hierarchy degeneracy in LBL experiments due to NSI have been discussed earlier [14,15] the new points that we make are : (i) if the NSI parameter ǫ ee characterizing new interactions between electrons neutrinos and electrons has the value ǫ ee = −1, the NSI effect cancels the standard matter effect; (ii) if in addition δ CP = ±π/2, there exists an exact intrinsic hierarchy degeneracy in the appearance channel, which is independent of baseline and the neutrino beam energy making it unsolvable in LBL experiments, in particular DUNE. Note that this degeneracy cannot be lifted even if ǫ ee and δ CP are precisely measured around these values.…”

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confidence: 99%

“…This result acquires more relevance in the light of the preference of T2K data and global oscillation analysis results implying δ CP ∼ −π/2. Although this is a special case of the generalized hierarchy degeneracy ǫ ee → −ǫ ee − 2, δ CP → π − δ CP , considered in [14], for any other value of ǫ ee and δ CP , a precise measurement of these parameters will alleviate the degeneracies. However for ǫ ee = −1 together with δ CP = ±π/2 that is not true.…”

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confidence: 99%

“…Among these, non-standard interactions have received a lot of attention lately specially * Email Address: deepthi@prl.res.in † Email Address: sruba@prl.res.in ‡ Email Address: newton@prl.res.in with the emergence of proposed next generation experiments like DUNE,T2HK, T2HKK etc. [4][5][6][7][8][9][10][11][12][13][14].…”

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confidence: 99%

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Can nonstandard interactions jeopardize the hierarchy sensitivity of DUNE?

2017

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We study the effect of non-standard interactions (NSIs) on the propagation of neutrinos through the Earth matter and how it affects the hierarchy sensitivity of the DUNE experiment. We emphasize on the special case when the diagonal NSI parameter ǫee = −1, nullifying the standard matter effect. We show that, if in addition, CP violation is maximal then this gives rise to an exact intrinsic hierarchy degeneracy in the appearance channel, irrespective of the baseline and energy. Introduction of off-diagonal NSI parameter, ǫeτ , shifts the position of this degeneracy to a different ǫee. Moreover the unknown magnitude and phases of the off-diagonal NSI parameters can give rise to additional degeneracies. Overall, given the current model independent limits on NSI parameters, the hierarchy sensitivity of DUNE can get seriously impacted. However, a more precise knowledge on the NSI parameters, specially ǫee, can give rise to an improved sensitivity. Alternatively, if NSI exists in nature, and still DUNE shows hierarchy sensitivity, certain ranges of the NSI parameters can be excluded. Additionally, we briefly discussed the implications of ǫee = −1 (in the Earth) on MSW effect in the Sun. Although neutrino oscillation has been identified as the dominant phenomenon to explain the results of various experiments, the possibility of sub-leading effects originating from new physics beyond the Standard Model (SM) cannot be ignored. Among these, non-standard interactions have received a lot of attention lately specially

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confidence: 80%

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confidence: 99%

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confidence: 99%

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confidence: 99%

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confidence: 99%

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Can nonstandard interactions jeopardize the hierarchy sensitivity of DUNE?

2017

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Non-unitarity, sterile neutrinos, and non-standard neutrino interactions

Blennow

Coloma

Fernández‐Martínez

et al. 2017

J. High Energ. Phys.

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Abstract:The simplest Standard Model extension to explain neutrino masses involves the addition of right-handed neutrinos. At some level, this extension will impact neutrino oscillation searches. In this work we explore the differences and similarities between the case in which these neutrinos are kinematically accessible (sterile neutrinos) or not (mixing matrix non-unitarity). We clarify apparent inconsistencies in the present literature when using different parametrizations to describe these effects and recast both limits in the popular neutrino non-standard interaction (NSI) formalism. We find that, in the limit in which sterile oscillations are averaged out at the near detector, their effects at the far detector coincide with non-unitarity at leading order, even in presence of a matter potential. We also summarize the present bounds existing in both limits and compare them with the expected sensitivities of near-future facilities taking the DUNE proposal as a benchmark. We conclude that non-unitarity effects are too constrained to impact present or near future neutrino oscillation facilities but that sterile neutrinos can play an important role at long baseline experiments. The role of the near detector is also discussed in detail.

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Capabilities of long-baseline experiments in the presence of a sterile neutrino

Dutta

Gandhi

Kayser

et al. 2016

J. High Energ. Phys.

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Assuming that there is a sterile neutrino, we ask what then is the ability of long-baseline experiments to i) establish that neutrino oscillation violates CP, ii) determine the three-neutrino mass ordering, and iii) determine which CP-violating phase or phases are the cause of any CP violation that may be observed. We find that the ability to establish CP violation and to determine the mass ordering could be very substantial. However, the effects of the sterile neutrino could be quite large, and it might prove very difficult to determine which phase is responsible for an observed CP violation. We explain why a sterile neutrino changes the long-baseline sensitivities to CP violation and to the mass ordering in the ways that it does. We note that long-baseline experiments can probe the presence of sterile neutrinos in a way that is different from, and complementary to, the probes of short-baseline experiments. We explore the question of how large sterile-active mixing angles need to be before long-baseline experiments can detect their effects, or how small they need to be before the interpretation of these experiments can safely disregard the possible existence of sterile neutrinos.

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Erratum: Generalized mass ordering degeneracy in neutrino oscillation experiments [Phys. Rev. D 94 , 055005 (2016)]

Cited by 46 publications

References 19 publications

Can nonstandard interactions jeopardize the hierarchy sensitivity of DUNE?

Can nonstandard interactions jeopardize the hierarchy sensitivity of DUNE?

Non-unitarity, sterile neutrinos, and non-standard neutrino interactions

Capabilities of long-baseline experiments in the presence of a sterile neutrino

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