Two moderately popular beyond the Standard Model neutrino physics models are strongly disfavored by empirical data.
Right-handed neutrinos are naturally induced by dark extra dimension models and play an essential role in neutrino oscillations. The model parameters can be examined by the long-baseline neutrino oscillation experiments. In this work, we compute the predicted neutrino oscillation spectra within/without extra dimension models and compare them with the experimental data. We find that the neutrino data in the T2K and NOvA experiments are compatible with the standard neutrino oscillation hypothesis. The results set the stringent exclusion limit on the extra dimension model parameters at a high confidence level. The derived constraints on dark dimension right-handed neutrinos are complementary to those results from the collider experiments and cosmological observations.
Ai-Yu Bai, Auttakit Chatrabhuti, Yin-Yuan Huang, Hiroshi Isono, Jian Tang, "Dark Dimension Right-handed Neutrinos Confronted with Long-Baseline Oscillation Experiments" arXiv:2601.00790 (January 2, 2026).
2 comments:
The microboone effort has released results. They contradict other older results, miniboone. One thing to look into is the detector fluid. Microboone used argon, miniboone used mineral oil. One carbon isotope in the mineral oil decays, releasing an electron antineutrino, one of the channels looked at. The electron neutrino channel is more complicated, but through carbon there is again possible background. I have always worried about the original miniboone because I was around and saw the politics that went on in the publication process.
Makes sense.
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