A combined study of source, detector and matter non-standard neutrino interactions at DUNE

Blennow, Mattias; Choubey, Sandhya; Ohlsson, Tommy; Pramanik, Dipyaman; Raut, Sushant K.

doi:10.1007/jhep08(2016)090

Cited by 86 publications

(95 citation statements)

References 28 publications

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“…These are shown in figure 2, and have been noticed in the context of NSI 5 in refs. [72][73][74][75] (for other works on degeneracies among standard and non-standard parameters in DUNE see e.g., refs. [76][77][78][79]).…”

Section: Jhep04(2017)153mentioning

confidence: 99%

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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Section: Jhep04(2017)153mentioning

confidence: 99%

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

Blennow

Coloma

Fernández‐Martínez

et al. 2017

J. High Energ. Phys.

Self Cite

202

310

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show abstract

“…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%

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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“…We also probe deviations due to new physics scenarios. We go beyond the SM in two respects -one in which we introduce subdominant effects due to a possible source of new physics dubbed as NSI [17][18][19][20][21][22][23][24][25][26] and another where the presence of extra sterile state can lead to non-unitarity in the 3×3 part even though the overall mixing matrix is still unitary [27][28][29][30][31][32][33][34] and examine consequences relevant to long baseline experiments (For other new physics scenarios such as non-unitarity, see [35][36][37][38][39]). We highlight the regions in L − E space where the effects due to CP and T violation are drastically modified due to new physics.…”

Section: Present Status Of Three Generation Neutrino Parametersmentioning

confidence: 99%

Can we probe intrinsic CP and T violations and nonunitarity at long baseline accelerator experiments?

2017

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One of the fundamental parameters entering neutrino oscillation framework is the leptonic CP phase δ 13 and its measurement is an important goal of the planned long baseline experiments. It should be noted that ordinary matter effects complicate the determination of this parameter and there are studies in literature that deal with separation of intrinsic versus extrinsic CP violation. It is important to investigate the consequences of new physics effects that can not only hamper the measurement of δ 13 , but also impact the consequences of discrete symmetries such as CP, T and unitarity in different oscillation channels. In the present work, we explore these discrete symmetries and implications on unitarity in presence of two new physics scenarios (non-standard interaction in propagation and presence of sterile neutrinos) that serve as good examples of going beyond the standard scenario in different directions. We uncover the impact of new physics scenarios on disentangling intrinsic and extrinsic CP violation.

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A combined study of source, detector and matter non-standard neutrino interactions at DUNE

Cited by 86 publications

References 28 publications

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

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

Can nonstandard interactions jeopardize the hierarchy sensitivity of DUNE?

Can we probe intrinsic CP and T violations and nonunitarity at long baseline accelerator experiments?

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