Antineutrinos and the failure of Occam’s Razor

Roger Barlow

William Of Ockham is one of the few medieval theologian/philosophers whose name survives today, thanks to his formulation of the principle known as Occam’s Razor. In the original latin, if you want to show off, it runs Non sunt multiplicanda entia sine necessitate, or Entities are not to be multiplied without necessity, which can be loosely paraphrased as The simplest explanation is the best one, an idea that is as attractive to a  21st century audience as it was back in the 14th.

 William of Ockham

Now fast forward a few centuries and let’s try and apply this to the neutrino. People talk about the “Dirac Neutrino” but that’s a bit off-target. Paul Dirac produced the definitive description not of the neutrino but of the electron. The Dirac Equation shows – as explained in countless graduate physics courses – that there have to be 2×2=4 types of electron: there…

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