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Right-handed weak currents in neutrinoless ββ decays and ton-scale ββ detectors

Hiroyasu Ejiri*, Takeshi Fukuyama†, and Toru Sato‡

  • *Contact author: ejiri@rcnp.osaka-u.ac.jp
  • †Contact author: fukuyama@rcnp.osaka-u.ac.jp
  • ‡Contact author: tsato@rcnp.osaka-u.ac.jp
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Phys. Rev. C 111, 065501 – Published 13 June, 2025

DOI: https://doi.org/10.1103/f4cf-vnr9

Abstract

Right-handed weak currents (RHCs) in the left-right symmetric model for neutrinoless double beta decays (DBDs) of both the 0+→0+ and 0+→2+ transitions are discussed from both theoretical and experimental viewpoints. 〈λ〉 and 〈η〉 terms are related by 〈λ〉/〈η〉≈tanβ, which is constrained in the regions of 1–60 for SUSY grand unified theories (GUTs) and of 1–165 for non-SUSY GUTs. The enhancement mechanisms of the 〈η〉 term over the 〈λ〉 term in the 0+ transition is shown, and the Δ isobar contribution to the nuclear matrix element (NME) for the transition to the 2+ state is found to be of the order of 20% of the NME with the quenched weak coupling. The new and interesting RHC regions of 〈λ〉≈5×10−8 and 〈η〉≈1.5×10−10 are shown to be exclusively explored by measuring both the ββ and γ rays associated with the ground and excited DBDs by means of the ton-scale DBD detectors for the inverted hierarchy ν masses. The actual RHCs to be studied depend on the RHC NMEs.

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Phys. Rev. C 111, 065501– Published 13 June, 2025
  • Received 13 January 2025
  • Revised 13 April 2025
  • Accepted 20 May 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.

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