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CP and T Violation in Neutrino Oscillations and Invariance of Jarlskog's Determinant to Matter Effects

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arxiv hep-ph/9912435 v1 pith:UHYRCZUQ submitted 1999-12-21 hep-ph

classification hep-ph
keywords effectsmatterviolationasymmetriesdeterminantneutrinoneutrinost-violating
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Terrestrial matter effects in neutrino propagation are T-invariant, so that any observed T violation when neutrinos pass through the Earth, such as an asymmetry between the transition probabilities P(nu_mu -> nu_e) and P(nu_e -> nu_mu), would be a direct indication of T violation at the fundamental level. Matter effects do however modify the magnitudes of T-violating asymmetries, and it has long been known that resonant enhancement can lead to large effects for a range of plausible values of the relevant parameters. We note that the determinant of the commutator of the lepton mass matrices is invariant under matter effects and use this fact to derive a new expression for the T-violating asymmetries of neutrinos propagating through matter. We give some examples which could have physical relevance.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Analytic formulae for T violation in neutrino oscillations

    hep-ph 2025-02 conditional novelty 6.0 of 10

    Analytic expressions for T violation are derived for standard neutrino oscillations, nonstandard interactions, and unitarity violation, with different energy dependences that could distinguish new physics.

  2. Impact of matter effects on the unitarity test of lepton mixing

    hep-ph 2026-05 unverdicted novelty 5.0 of 10

    The authors examine extraction of lepton mixing matrix elements from spectral data in neutrino oscillation experiments including matter effects and test unitarity via a vanishing quantity in a four-generation model.

  3. Torsional four-fermion interaction for Majorana neutrinos

    hep-ph 2026-06 unverdicted novelty 4.0 of 10

    Torsion-induced four-fermion interactions modify effective masses and mixing parameters for Majorana neutrinos with sterile partners in matter.

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