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arXiv · 2509.05233

Searching for a Dark Dimension Right-handed Neutrino in KATRIN

Ignatios Antoniadis·Auttakit Chatrabhuti·Hiroshi Isono
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Abstract

We study the possibility that the Right-handed neutrino is a five-dimensional state propagating along a micron size extra dimension, as required in the dark dimension proposal. We work out the signatures of R-neutrino production in KATRIN experiment and compare them with those of a sterile neutrino which manifests by a kink in the electron energy spectrum of the beta-decay at a value corresponding to the sterile neutrino mass. We explore the allowed parameter space of the compactification scale and the R-neutrino bulk mass versus the Yukawa coupling, and show that a large part of it is within KATRIN's sensitivity. When the bulk mass is much smaller than the compactification scale, several kinks could be observed corresponding to the positions of the R-neutrino Kaluza-Klein excitations, while for large bulk mass there will be effectively one kink at the position of the bulk mass.

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Ignatios Antoniadis, Auttakit Chatrabhuti, Hiroshi Isono. 2025-09-05. Searching for a Dark Dimension Right-handed Neutrino in KATRIN. https://doi.org/10.1007/jhep02(2026)015

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