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Phenomenology of Dirac neutrino EFTs up to dimension six

Anirban Biswas1,2,*, Eung Jin Chun3,†, Sanjoy Mandal3,‡, and Dibyendu Nanda4,5,§

  • *Contact author: anirban.biswas.sinp@gmail.com
  • †Contact author: ejchun@kias.re.kr
  • ‡Contact author: smandal@kias.re.kr
  • §Contact author: dibyendu.nanda@iopb.res.in
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Phys. Rev. D 112, 055023 – Published 17 September, 2025

DOI: https://doi.org/10.1103/rtpz-4318

Abstract

The gauge-singlet right-handed neutrinos would be essential to explain the tiny masses of active neutrinos. We consider the effective field theory of the Standard Model extended with these fields under the assumption that neutrinos are Dirac particles. In this framework, we provide a comprehensive study for the phenomenological consequences of various dimension six interactions employing various high and low energy observables. These include the neutrino mass itself, constraints from electroweak precision test and collider searches for lepton or jet plus missing energy, coherent neutrino-nucleus scattering, beta decays, as well as decays of proton, meson, tau, and top. We also study their astrophysical and cosmological implications for stellar cooling and relativistic degrees of freedom.

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Phys. Rev. D 112, 055023– Published 17 September, 2025
  • Received 3 April 2025
  • Accepted 3 September 2025
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