Nonstandard interactions spoiling the<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 sensitivity at DUNE and other long baseline experiments

Masud, Mehedi; Mehta, Poonam

doi:10.1103/physrevd.94.013014

Cited by 70 publications

(65 citation statements)

References 61 publications

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“…Before closing let us also mention that CP ambiguities will also arise within generic non-standard interaction schemes not directly related to a seesaw mechanism as the origin of neutrino mass. Likewise, dedicated studies, analogous to those in [32][33][34][35] will be required here in order to cover each experimental setup.…”

Section: Discussionmentioning

confidence: 99%

New Ambiguity in ProbingCPViolation in Neutrino Oscillations

2016

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If neutrinos get mass via the seesaw mechanism the mixing matrix describing neutrino oscillations can be effectively nonunitary. We show that in this case the neutrino appearance probabilities involve a new CP phase φ associated with nonunitarity. This leads to an ambiguity in extracting the "standard" three-neutrino phase δCP , which can survive even after neutrino and antineutrino channels are combined. Its existence should be taken into account in the planning of any oscillation experiment aiming at a robust measurement of δCP .

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Section: Discussionmentioning

confidence: 99%

New Ambiguity in ProbingCPViolation in Neutrino Oscillations

2016

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“…Many recent studies have explored this question for DUNE [6][7][8][9][10] in the context of matter NSIs. In figure 2, we show the effect of NSIs on the precision measurement of θ 23 and δ when the true values of these parameters are 42 • and −90 • , respectively.…”

Section: Effect On Precision Measurements At Dunementioning

confidence: 99%

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

Blennow

Choubey

Ohlsson

et al. 2016

J. High Energ. Phys.

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We simultaneously investigate source, detector and matter non-standard neutrino interactions at the proposed DUNE experiment. Our analysis is performed using a Markov Chain Monte Carlo exploring the full parameter space. We find that the sensitivity of DUNE to the standard oscillation parameters is worsened due to the presence of non-standard neutrino interactions. In particular, there are degenerate solutions in the leptonic mixing angle θ 23 and the Dirac CP-violating phase δ. We also compute the expected sensitivities at DUNE to the non-standard interaction parameters. We find that the sensitivities to the matter non-standard interaction parameters are substantially stronger than the current bounds (up to a factor of about 15). Furthermore, we discuss correlations between the source/detector and matter non-standard interaction parameters and find a degenerate solution in θ 23 . Finally, we explore the effect of statistics on our results.

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“…[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]). The first degeneracy appears for the wrong octant of θ 23 , which would otherwise be correctly determined by the interplay between the appearance and disappearance channels at DUNE (see e.g., ref.…”

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.

205

310

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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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Nonstandard interactions spoiling theCPviolation sensitivity at DUNE and other long baseline experiments

Cited by 70 publications

References 61 publications

New Ambiguity in ProbingCPViolation in Neutrino Oscillations

New Ambiguity in ProbingCPViolation in Neutrino Oscillations

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

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

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