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Majorana Neutrinos, CP-Violation, Neutrinoless Double-Beta and Tritium-Beta Decays

Silvia Pascoli, S.T. Petcov, S. T. Petcov

Open publisher page 9 citations

Abstract

If the present or upcoming searches for neutrinoless double β − ((ββ)0ν-) decay give a positive result, the Majorana nature of massive neutrinos will be established. From the determination of the value of the (ββ)0ν-decay effective Majorana mass parameter (| |), it would be possible to obtain information on the type of neutrino mass spectrum. Assuming 3-ν mixing and massive Majorana neutrinos, we discuss the information a measurement of, or an upper bound on, | | can provide on the value of the lightest neutrino mass m1. With additional data on the neutrino masses obtained in 3 H β−decay experiments, it might be possible to establish whether the CP-symmetry is violated in the lepton sector. This would require very high precision measurements. If CP-invariance holds, the allowed patterns of the relative CP-parities of the massive Majorana neutrinos would be determined. 1

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What this paper is about

If the present or upcoming searches for neutrinoless double β − ((ββ)0ν-) decay give a positive result, the Majorana nature of massive neutrinos will be established. From the determination of the value of the (ββ)0ν-decay effective Majorana mass parameter (| |), it would be possible to obtain information on the type of neutrino mass spectrum. Assuming 3-ν mixing and massive Majorana neutrinos, we discuss the information a measurement of, or an upper bound on, | | can provide on the value of the lightest neutrino mass m1. With additional data on the neutrino masses obtained in 3 H β−decay experiments, it might be possible to establish whether the CP-symmetry is violated in the lepton sector. This would require very high precision measurements. If CP-invariance holds, the allowed patterns of the relative CP-parities of the massive Majorana neutrinos would be determined. 1

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Available abstract

If the present or upcoming searches for neutrinoless double β − ((ββ)0ν-) decay give a positive result, the Majorana nature of massive neutrinos will be established. From the determination of the value of the (ββ)0ν-decay effective Majorana mass parameter (| |), it would be possible to obtain information on the type of neutrino mass spectrum. Assuming 3-ν mixing and massive Majorana neutrinos, we discuss the information a measurement of, or an upper bound on, | | can provide on the value of the lightest neutrino mass m1. With additional data on the neutrino masses obtained in 3 H β−decay experiments, it might be possible to establish whether the CP-symmetry is violated in the lepton sector. This would require very high precision measurements. If CP-invariance holds, the allowed patterns of the relative CP-parities of the massive Majorana neutrinos would be determined. 1

Key concepts: MAJORANA, Particle physics, Neutrino, Physics, Double beta decay, Lepton number, Sterile neutrino, Lepton

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