BWhat changed
The KATRIN collaboration fitted an effective description of additional neutrino interactions to about four million electrons recorded in its second tritium measurement campaign. The analysis found no significant spectral distortion beyond its reference model and reported confidence regions for selected light- and heavier-neutrino interaction parameters. It extended endpoint spectroscopy to interaction searches using an existing experimental dataset.
Scientific scope
The KATRIN collaboration fitted an effective description of additional neutrino interactions to about four million electrons recorded in its second tritium measurement campaign. The analysis found no significant spectral distortion beyond its reference model and reported confidence regions for selected light- and heavier-neutrino interaction parameters. It extended endpoint spectroscopy to interaction searches using an existing experimental dataset. The constraints depend on the effective interaction model, detector response, molecular final states and specified mass and coupling assumptions. They neither identify a new particle nor exclude every possible interaction model. The 45-day sample overlaps KATRIN’s mass-measurement program; future exposure and TRISTAN sensitivity are projections. The cited author revision dates to November 2024; the 2025 journal publication is a different version.
Evidence
The linked original works support the scoped statement and contribution attribution. WRS has not independently replayed experiments or reconstructed a full mathematical proof. The constraints depend on the effective interaction model, detector response, molecular final states and specified mass and coupling assumptions. They neither identify a new particle nor exclude every possible interaction model. The 45-day sample overlaps KATRIN’s mass-measurement program; future exposure and TRISTAN sensitivity are projections. The cited author revision dates to November 2024; the 2025 journal publication is a different version.
Contributors
- The named authors in the research record · SCIENCE: These are the listed authors of the cited contribution sources. Paper authorship does not quantify individual effort. An incomplete list is explicitly marked; same names are not automatically merged.
Provisional WRS assessment, edition 2026-10-28.1. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.
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