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Peer-reviewedCC BY 4.0Journal of High Energy Physics

Interplay of CPT-violating and CPT-conserving Lorentz invariance violation at DUNE

  • Priyankush Deka1
  • Arnab Sarker2
  • Moon Moon Devi1
  • Sushant K. Raut3
  1. 1Tezpur University
  2. 2Indian Association for the Cultivation of Science
  3. 3Krea University
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Abstract

A bstract : 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 5 σ 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 3 σ 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 5 σ . These findings emphasize the importance of incorporating LIV effects in precision oscillation studies at upcoming long-baseline experiments.

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Cite

BibTeXRIS
BibTeX
@article{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},
  journal = {Journal of High Energy Physics},
  year = {2026},
  month = oct,
  doi = {10.1007/jhep10(2026)110},
  url = {https://link.springer.com/10.1007/JHEP10(2026)110},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
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  - 2026/10/09
JO  - Journal of High Energy Physics
DO  - 10.1007/jhep10(2026)110
UR  - https://link.springer.com/10.1007/JHEP10(2026)110
AB  - A bstract : 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 5 σ 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 3 σ 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 5 σ . These findings emphasize the importance of incorporating LIV effects in precision oscillation studies at upcoming long-baseline experiments.
SN  - 1029-8479
ER  -