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The question of whether neutrinos have nonzero rest masses: oscillation evidence for mass splittings, absolute mass scale and hierarchy (normal vs. inverted), Majorana vs. Dirac nature, neutrinoless double-beta decay searches, cosmological mass limits, and whether massive neutrinos fit within the Standard Model (e.g. via Dirac vs. Weinberg operator mechanisms).

Nonzero neutrino masses require physics beyond the Standard Model

UnassessedNo current assessment. Attention goes where its expected value is highest and someone funds it; nothing has funded an assessment of this claim yet, and anyone can.constitution →empirical · derivedA factual claim that rests on inference from other evidence rather than direct observation.constitution →Beyond the Standard Model Particle physicsimportance · minorImportance 0.25, from 0 to 1 · minor: narrow or largely settled, cheap to get right. Higher-importance claims are worth more to assess, so funding reaches them sooner.constitution →

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