to be less than 130 billion electron volts, and the Higgs weighed in at 125. But that success turned sour because the LHC did not find the SUSY particles that were supposed to be there to keep the Higgs mass so low. Without the SUSY particles,
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, the Higgs mass is not natural at all.
“This is either a challenge to naturalness or a challenge to our ability to construct natural theories,” writes Nathaniel Craig of the Institute for Advanced Study in Princeton,
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, N.J. But it does not,
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, as has been rather widely implied, mean that the SUSY theory is necessarily wrong.
“I do not mean this to say that there is no supersymmetry in nature,” Craig writes. “Rather,
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, I mean that the march of null results suggests that we were mostly wrong about precisely how supersymmetry would appear at the LHC.”
In fact,
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, naturalness is just one of two principles that led to the belief that the LHC would find SUSY. There’s also parsimony, the old Occam’s razor notion of explaining more with less. If you want to explain why, say, five numbers are what they are,
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, your theory shouldn’t require six new numbers. If several numbers are fine-tuned — if you just have to throw up your hands and say you don’t know why they’re what they are — then you don’t know much. But if one or two numbers can explain why all the other numbers are precisely what they are,
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, then you have parsimony.
“We built our expectations for supersymmetry at the LHC on the twin pillars of parsimony and naturalness,
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,” Craig writes. “The null results at the LHC suggest that those two pillars were perhaps not the right

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