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

Rout, J.; Masud, Mehedi; Mehta, Poonam

doi:10.1103/physrevd.95.075035

Cited by 25 publications

(18 citation statements)

References 69 publications

(105 reference statements)

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“…In recent years, rich literature has been developed on the possibility of detecting the NSI effects in upcoming long baseline neutrino experiments. In particular, degeneracies induced by the presence of NSI in the DUNE experiment have been scrutinized [15][16][17][18][214][215][216][217][218][219][220][221][222][223][224]. In sect.…”

Section: Impact Of Recent Results From Coherent Experimentsmentioning

confidence: 99%

Neutrino Oscillations and Non-standard Interactions

2018

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Current neutrino experiments are measuring the neutrino mixing parameters with an unprecedented accuracy. The upcoming generation of neutrino experiments will be sensitive to subdominant neutrino oscillation effects that can in principle give information on the yet-unknown neutrino parameters: the Dirac CP-violating phase in the PMNS mixing matrix, the neutrino mass ordering and the octant of θ 23 . Determining the exact values of neutrino mass and mixing parameters is crucial to test various neutrino models and flavor symmetries that are designed to predict these neutrino parameters. In the first part of this review, we summarize the current status of the neutrino oscillation parameter determination. We consider the most recent data from all solar neutrino experiments and the atmospheric neutrino data from Super-Kamiokande, IceCube, and ANTARES. We also implement the data from the reactor neutrino experiments KamLAND, Daya Bay, RENO, and Double Chooz as well as the long baseline neutrino data from MINOS, T2K, and NOνA. If in addition to the standard interactions, neutrinos have subdominant yet-unknown Non-Standard Interactions (NSI) with matter fields, extracting the values of these parameters will suffer from new degeneracies and ambiguities. We review such effects and formulate the conditions on the NSI parameters under which the precision measurement of neutrino oscillation parameters can be distorted. Like standard weak interactions, the non-standard interaction can be categorized into two groups: Charged Current (CC) NSI and Neutral Current (NC) NSI. Our focus will be mainly on neutral current NSI because it is possible to build a class of models that give rise to sizeable NC NSI with discernible effects on neutrino oscillation. These models are based on new U(1) gauge symmetry with a gauge boson of mass 10 MeV. The UV complete model should be of course electroweak invariant which in general implies that along with neutrinos, charged fermions also acquire new interactions on which there are strong bounds. We enumerate the bounds that already exist on the electroweak symmetric models and demonstrate that it is possible to build viable models avoiding all these bounds. In the end, we review methods to test these models and suggest approaches to break the degeneracies in deriving neutrino mass parameters caused by NSI.

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Section: Impact Of Recent Results From Coherent Experimentsmentioning

confidence: 99%

Neutrino Oscillations and Non-standard Interactions

2018

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“…The DUV and IUV effects may have significant impact on the CP violation measurements [54][55][56][57][58][59]. In Fig.…”

Section: Simulation Resultsmentioning

confidence: 99%

Probing direct and indirect unitarity violation in future accelerator neutrino facilities

Tang

Zhang

2017

Physics Letters B

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The possible existence of light and heavy sterile neutrinos may give rise to direct and indirect unitarity violation of the 3 × 3 lepton mixing matrix respectively. In the current work we study the potential of future accelerator neutrino facilities in probing the unitarity violation effects. Taking DUNE, T2HK and a low-energy Neutrino Factory (LENF) as working examples of future accelerator neutrino facilities, we study the distinct effects of direct and indirect unitarity violation on the discovery reach of the leptonic CP violation and precision measurements of θ 23 in the three neutrino framework. In addition, constraints on the additional mixing parameters of direct and indirect unitarity violation are also discussed.Finally, we stress that the combination of experiments with different oscillation channels, different neutrino beams and different detector techniques will be an effective solution to the parameter degeneracy problem and give the robust measurement of leptonic CP violation even if the direct and indirect unitarity violation are taken into account.

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“…Recently, NSI have been discussed regarding the Hyper-Kamiokande experiment in Refs. [74,[91][92][93][94][95][96]. This work adds to the discussion of NSI at Hyper-K by conducting a thorough, multi-parameter analysis of the sensitivity of the experiment, utilizing both its beam-and atmospheric-based capabilities.This manuscript is organized as follows: in Section II, we introduce the oscillation formalism used when discussing the three-massive-neutrinos paradigm, as well as the extensions to this: sterile neutrinos and non-standard neutrino interactions.…”

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confidence: 99%

Searches for new physics at the Hyper-Kamiokande experiment

Kelly

2017

Phys. Rev. D

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We investigate the ability of the upcoming Hyper-Kamiokande (Hyper-K) neutrino experiment to detect new physics phenomena beyond the standard, three-massive-neutrinos paradigm; namely the existence of a fourth, sterile neutrino or weaker-than-weak, non-standard neutrino interactions. With both beam-based neutrinos from the Japan Proton Accelerator Research Complex (J-PARC) and atmospheric neutrinos, Hyper-K is capable of exploring new ranges of parameter space in these new-physics scenarios. We find that Hyper-K has comparable capability to the upcoming Deep Underground Neutrino Experiment (DUNE), and that combining both beam- and atmospheric-based data can clear up degeneracies in the parameter spaces of interest. We also comment on the potential improvement in searches for new physics if a combined analysis were performed using Hyper-K and DUNE data.Comment: 14 pages, 8 figures. Minor changes to results; matches published versio

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

Cited by 25 publications

References 69 publications

Neutrino Oscillations and Non-standard Interactions

Neutrino Oscillations and Non-standard Interactions

Probing direct and indirect unitarity violation in future accelerator neutrino facilities

Searches for new physics at the Hyper-Kamiokande experiment

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