Independent measurement of muon neutrino and antineutrino oscillations at the INO–ICAL experiment

Dar, Z. Ahmad; Kaur, Daljeet; Kumar, Sanjeev; Naimuddin, M.

doi:10.1088/1361-6471/ab11f4

Cited by 4 publications

(3 citation statements)

References 44 publications

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“…[16][17][18][19][20][21]. ICAL would be able to determine these parameters separately in the neutrino and antineutrino channels [22,23]. The difference between these analyses and our study is that Refs.…”

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confidence: 77%

“…The difference between these analyses and our study is that Refs. [16][17][18][19][20][21][22][23] employ the χ 2 method, while the focus of our study is to identify the oscillation dip and the oscillation valley, independently in μ − and μ + events, and determine the oscillation parameters from them. This is possible due to the wide range of energy and baselines reconstructed at ICAL with excellent detector properties.…”

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confidence: 99%

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From oscillation dip to oscillation valley in atmospheric neutrino experiments

et al. 2021

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Atmospheric neutrino experiments can show the “oscillation dip” feature in data, due to their sensitivity over a large L/E range. In experiments that can distinguish between neutrinos and antineutrinos, like INO, oscillation dips can be observed in both these channels separately. We present the dip-identification algorithm employing a data-driven approach – one that uses the asymmetry in the upward-going and downward-going events, binned in the reconstructed L/E of muons – to demonstrate the dip, which would confirm the oscillation hypothesis. We further propose, for the first time, the identification of an “oscillation valley” in the reconstructed ($$E_\mu $$ E μ ,$$\,\cos \theta _\mu $$ cos θ μ ) plane, feasible for detectors like ICAL having excellent muon energy and direction resolutions. We illustrate how this two-dimensional valley would offer a clear visual representation and test of the L/E dependence, the alignment of the valley quantifying the atmospheric mass-squared difference. Owing to the charge identification capability of the ICAL detector at INO, we always present our results using $$\mu ^{-}$$ μ - and $$\mu ^{+}$$ μ + events separately. Taking into account the statistical fluctuations and systematic errors, and varying oscillation parameters over their currently allowed ranges, we estimate the precision to which atmospheric neutrino oscillation parameters would be determined with the 10-year simulated data at ICAL using our procedure.

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confidence: 77%

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confidence: 99%

From oscillation dip to oscillation valley in atmospheric neutrino experiments

et al. 2021

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“…This possibility has been explored by the INO Collaboration in refs. [101,102]. In the present work, for the first time, we explore in detail the impact of CPT-violating LIV parameters in the SME framework using the atmospheric neutrinos at the ICAL detector.…”

Section: Jhep03(2022)050mentioning

confidence: 99%

Probing Lorentz Invariance Violation with atmospheric neutrinos at INO-ICAL

Sahoo

Kumar

Agarwalla

2022

J. High Energ. Phys.

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The possibility of Lorentz Invariance Violation (LIV) may appear in unified theories, such as string theory, which allow the existence of a new space-time structure at the Planck scale (Mp ∼ 1019 GeV). This effect can be observed at low energies with a strength of ∼ 1/Mp using the perturbative approach. In the minimal Standard Model extension (SME) framework, the neutrino mass-induced flavor oscillation gets modified in the presence of LIV. The Iron Calorimeter (ICAL) detector at the proposed India-based Neutrino Observatory (INO) offers a unique window to probe these LIV parameters by observing atmospheric neutrinos and antineutrinos separately over a wide range of baselines in the multi-GeV energy range. In this paper, for the first time, we study in detail how the CPT-violating LIV parameters (aμτ, aeμ, aeτ) can alter muon survival probabilities and expected μ− and μ+ event rates at ICAL. Using 500 kt·yr exposure of ICAL, we place stringent bounds on these CPT-violating LIV parameters at 95% C.L., which are slightly better than the present Super-Kamiokande limits. We demonstrate the advantage of incorporating hadron energy information and charge identification capability at ICAL while constraining these LIV parameters. Further, the impact of the marginalization over the oscillation parameters and choice of true values of sin2θ23 on LIV constraints is described. We also study the impact of these LIV parameters on mass ordering determination and precision measurement of atmospheric oscillation parameters.

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Constraining non-unitary neutrino mixing using matter effects in atmospheric neutrinos at INO-ICAL

Sahoo,

Das,

Kumar

et al. 2024

J. High Energ. Phys.

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The mass-induced neutrino oscillation is a well established phenomenon that is based on the unitary mixing among three light active neutrinos. Remarkable precision on neutrino mixing parameters over the last decade or so has opened up the prospects for testing the possible non-unitarity of the standard 3ν mixing matrix, which may arise in the seesaw extensions of the Standard Model due to the admixture of three light active neutrinos with heavy isosinglet neutrinos. Because of this non-unitary neutrino mixing (NUNM), the oscillation probabilities among the three active neutrinos would be altered as compared to the probabilities obtained assuming a unitary 3ν mixing matrix. In such a NUNM scenario, neutrinos can experience an additional matter effect due to the neutral current interactions with the ambient neutrons. Atmospheric neutrinos having access to a wide range of energies and baselines can experience a significant modifications in Earth’s matter effect due to NUNM. In this paper, we study in detail how the NUNM parameter α32 affects the muon neutrino and antineutrino survival probabilities in a different way. Then, we place a comparable and complementary constraint on α32 in a model independent fashion using the proposed 50 kt magnetized Iron Calorimeter (ICAL) detector under the India-based Neutrino Observatory (INO) project, which can efficiently detect the atmospheric νμ and $$ {\overline{\nu}}_{\mu } $$ ν ¯ μ separately in the multi-GeV energy range. Further, we discuss the advantage of charge identification capability of ICAL and the impact of uncertainties in oscillation parameters while constraining α32. We also compare the α32 sensitivity of ICAL with that of future long-baseline experiments DUNE and T2HK in isolation and combination.

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Independent measurement of muon neutrino and antineutrino oscillations at the INO–ICAL experiment

Cited by 4 publications

References 44 publications

From oscillation dip to oscillation valley in atmospheric neutrino experiments

From oscillation dip to oscillation valley in atmospheric neutrino experiments

Probing Lorentz Invariance Violation with atmospheric neutrinos at INO-ICAL

Constraining non-unitary neutrino mixing using matter effects in atmospheric neutrinos at INO-ICAL

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