The cosmological constant problem is a failure of naturalness and suggests that a fine-tuning mechanism is at work , which may also address the hierarchy problem .
An example – supported by Weinberg ’ s successful prediction of the cosmological constant – is the potentially vast landscape of vacua in string theory , where the existence of galaxies and atoms is promoted to a vacuum selection criterion .
Then , low energy SUSY becomes unnecessary , and supersymmetry – if present in the fundamental theory – can be broken near the unification scale .
All the scalars of the supersymmetric standard model become ultraheavy , except for a single finely tuned Higgs .
Yet , the fermions of the supersymmetric standard model can remain light , protected by chiral symmetry , and account for the successful unification of gauge couplings .
This framework removes all the difficulties of the SSM : the absence of a light Higgs and sparticles , dimension five proton decay , SUSY flavor and CP problems , and the cosmological gravitino and moduli problems .
High-scale SUSY breaking raises the mass of the light Higgs to \sim 120 - 150 GeV .
The gluino is strikingly long lived , and a measurement of its lifetime can determine the ultraheavy scalar mass scale .
Measuring the four Yukawa couplings of the Higgs to the gauginos and higgsinos precisely tests for high-scale SUSY .
These ideas , if confirmed , will demonstrate that supersymmetry is present but irrelevant for the hierarchy problem – just as it has been irrelevant for the cosmological constant problem – strongly suggesting the existence of a fine-tuning mechanism in nature .