Interplay of CPT-Violating and CPT-Conserving Lorentz Invariance Violation at DUNE
Abstract
We present a study of Lorentz invariance violation (LIV) in neutrino oscillations, with primary emphasis on the interplay between CPT-violating and CPT-conserving Standard Model Extension (SME) coefficients. We find that aee and aττ dominate among the diagonal LIV coefficients, whereas aeμ and aeτ provide the most significant off-diagonal contributions. In contrast, the corresponding cαβ coefficients have comparatively sub-leading effects. Taking DUNE as a representative long-baseline experiment, we show that the sensitivity to CP violation is modified by LIV in a parameter-specific manner. We find correlations between off-diagonal LIV parameters, and non-trivial dependence on the new phases. In absence of LIV, DUNE is expected to establish CP violation at 5σ for a limited fraction of δCP values. We find that the presence of aee, aττ, aeμ and aeτ weakens the CP discovery potential, reducing the achievable significance to below 3σ over a substantial fraction of δCP. The independent impact of cαβ terms also results in suppression, but in combination with aαβ, they introduce degeneracies, complicating the extraction of δCP. This generally results in a deterioration of CP violation sensitivities below 5σ. These findings emphasize the importance of incorporating LIV effects in precision oscillation studies at upcoming long-baseline experiments.
Versions
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BibTeX
@misc{deka2026interplay,
title = {{Interplay of CPT-Violating and CPT-Conserving Lorentz Invariance Violation at DUNE}},
author = {Priyankush Deka and Arnab Sarker and Moon Moon Devi and Sushant K. Raut},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2607.06513},
eprint = {2607.06513},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2607.06513},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Interplay of CPT-Violating and CPT-Conserving Lorentz Invariance Violation at DUNE
AU - Priyankush Deka
AU - Arnab Sarker
AU - Moon Moon Devi
AU - Sushant K. Raut
PY - 2026
DA - 2026/10/12
PB - arXiv
DO - 10.48550/arxiv.2607.06513
UR - https://arxiv.org/abs/2607.06513
AB - We present a study of Lorentz invariance violation (LIV) in neutrino oscillations, with primary emphasis on the interplay between CPT-violating and CPT-conserving Standard Model Extension (SME) coefficients. We find that a_ee and a_ττ dominate among the diagonal LIV coefficients, whereas a_eμ and a_eτ provide the most significant off-diagonal contributions. In contrast, the corresponding c_αβ coefficients have comparatively sub-leading effects. Taking DUNE as a representative long-baseline experiment, we show that the sensitivity to CP violation is modified by LIV in a parameter-specific manner. We find correlations between off-diagonal LIV parameters, and non-trivial dependence on the new phases. In absence of LIV, DUNE is expected to establish CP violation at 5σ for a limited fraction of δ_CP values. We find that the presence of a_ee, a_ττ, a_eμ and a_eτ weakens the CP discovery potential, reducing the achievable significance to below 3σ over a substantial fraction of δ_CP. The independent impact of c_αβ terms also results in suppression, but in combination with a_αβ, they introduce degeneracies, complicating the extraction of δ_CP. This generally results in a deterioration of CP violation sensitivities below 5σ. These findings emphasize the importance of incorporating LIV effects in precision oscillation studies at upcoming long-baseline experiments.
ER -