to an extraordinarily high degree of precision — the technical term for that is “fine tuning.”) Naturalness, to physicists,
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, means no (or very little) fine tuning.
A nice historical illustration of this concept comes from Jonathan Feng, of the University of California, Irvine,
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, in a recent article in the Annual Review of Nuclear and Particle Science. It turns out that Isaac Newton himself articulated the meaning of naturalness in response to a question about how the universe could be static. (In those days,
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, nobody knew the universe was expanding.) If all masses attracted,
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, why wouldn’t everything in the universe be moving closer and closer together? Newton replied that it was indeed a very unnatural state of affairs. A mass would have to be placed precisely at the center of all other masses, attracted equally in all directions,
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, to remain motionless. Achieving such a state, Newton said,
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, would be “fully as hard as to make the sharpest needle stand upright on its point upon a looking-glass.”
Newton’s solution was to suppose that some divine power had established the precisely proper (and finely tuned) initial conditions to sustain a static infinite universe. But that was a supernatural explanation, not a natural one.
In the Higgs case, a prime candidate for a natural explanation was supersymmetry,
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, aka SUSY. SUSY adds a new set of subatomic particles into the mix,
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, one superpartner for each previously known particle. When the presence of the superparticles is accommodated in the equations, the Higgs mass comes out just right — SUSY required it

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