CP and T Violation in Neutrino Oscillations

Minakata, Hisakazu; Nunokawa, Hiroshi; Parke, Stephen J.

doi:10.1063/1.1594326

Cited by 4 publications

(4 citation statements)

References 13 publications

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“…For the atmospheric neutrinos, flavor changing neutral currents (FCNC) [37], Lorentz invariance violation (LIV), and Equivalence Principle Violation (EPV) [38,39] models for neutrino mixing have been suggested as alternatives to conventional flavor mixing. However, they are not consistent with zenith or upward throughgoing distributions.…”

Section: Alternatives To Neutrino Oscillationsmentioning

confidence: 99%

Neutrino oscillation workshop 2000: conference summary

Langacker

2001

Nuclear Physics B - Proceedings Supplements

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The NOW2000 Workshop summarized the present status and future possibilities for all aspects of neutrino physics and astrophysics. Neutrino oscillation physics has truly come of age in the last few years. It is now data driven (analogous to cosmology and much of high energy physics in general). Experimental techniques and the theoretical interpretation have developed dramatically. An example of the latter includes the more realistic analysis of neutrino oscillations in the framework of 3 or more mass eigenstates. The phenomenological emphasis has shifted from degenerate to hierarchical neutrino spectra.

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Section: Alternatives To Neutrino Oscillationsmentioning

confidence: 99%

Neutrino oscillation workshop 2000: conference summary

Langacker

2001

Nuclear Physics B - Proceedings Supplements

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“…As the genuine T-odd A CP;T αβ component is CPT-invariant and thus CP-odd, a positive answer to this question would be equivalent to claim the absence of fake matter-induced terms in the T asymmetries, and hence a negative answer to the title of this paper. In the literature on T asymmetries for neutrino oscillations [3][4][5][6][7][8][9][10][11][12][13][14][15] one does not find definite claims on this question, even for a T-symmetric matter between the source and the detector (and, a fortiori, for uniform matter) neither in one nor the other sense of the response. Contrary to the fake A CP;CPT αβ component of the CP asymmetry, which exists even in the absence of true CP violation, if the medium is Tsymmetric it, by itself, cannot generate a T asymmetry in neutrino oscillations.…”

Section: Introductionmentioning

confidence: 99%

Do T asymmetries for neutrino oscillations in uniform matter have a CP-even component?

Bernabéu

Segarra

2019

J. High Energ. Phys.

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Observables of neutrino oscillations in matter have, in general, contributions from the effective matter potential. It contaminates the CP violation asymmetry adding a fake effect that has been recently disentangled from the genuine one by their different behavior under T and CPT. Is the genuine T-odd CPT-invariant component of the CP asymmetry coincident with the T asymmetry? Contrary to CP, matter effects in uniform matter cannot induce by themselves a non-vanishing T asymmetry; however, the question of the title remained open. We demonstrate that, in the presence of genuine CP violation, there is a new non-vanishing CP-even, and so CPT-odd, component in the T asymmetry in matter, which is of odd-parity in both the phase δ of the flavor mixing and the matter parameter a. The two disentangled components, genuine A T;CP αβ and fake A T;CPT αβ , could be experimentally separated by the measurement of the two T asymmetries in matter (ν α ↔ ν β ) and (ν α ↔ν β ). For the (ν µ ↔ ν e ) transitions, the energy dependence of the new A T;CPT µe component is like the matter-induced term A CP;CPT µe of the CP asymmetry which is odd under a change of the neutrino mass hierarchy. We have thus completed the physics involved in all observable asymmetries in matter by means of their disentanglement into the three independent components, genuine A CP;T αβ and fake A CP;CPT αβ and A T;CPT αβ .

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“…The neutrino oscillation phenomena still depends on three unknown parameters: mixing angle θ 13 , sign of ∆m 2 13 , and the CP phase δ. Measurement of θ 13 in appearance experiments, such as the ones based on accelerator, are subjected to suffer from the so called parameter degeneracies due to the effect of the unknown sign of ∆m 2 13 and the CP phase δ in neutrino oscillations [1].…”

Section: Introductionmentioning

confidence: 99%

“…Measurement of θ 13 in appearance experiments, such as the ones based on accelerator, are subjected to suffer from the so called parameter degeneracies due to the effect of the unknown sign of ∆m 2 13 and the CP phase δ in neutrino oscillations [1].…”

Section: Introductionmentioning

confidence: 99%

Angra Neutrino Project: status and plans

Anjos¹,

Barbosa²,

Funchal³

et al. 2006

Nuclear Physics B - Proceedings Supplements

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We present the status and plans of the Angra Project, a new nuclear reactor neutrino oscillation experiment, proposed to be built in Brazil at the Angra dos Reis nuclear reactor complex. This experiment is aimed to measure θ13, the last unknown of the three neutrino mixing angles. Combining a high luminosity design, very low background from cosmic rays and careful control of systematic errors at the 1% level, we propose a high sensitivity multi-detector experiment, able to reach a sensitivity to antineutrino disappearance down to sin 2 2θ13 = 0.006 in a three years running period, improving present limits constrained by the CHOOZ experiment by more than an order of magnitude.

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CP and T Violation in Neutrino Oscillations

Cited by 4 publications

References 13 publications

Neutrino oscillation workshop 2000: conference summary

Neutrino oscillation workshop 2000: conference summary

Do T asymmetries for neutrino oscillations in uniform matter have a CP-even component?

Angra Neutrino Project: status and plans

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