Alternative, currently unknown, resolution of the Standard Model naturalness problem without low-scale supersymmetry

Identify a mechanism, other than low-scale supersymmetry, that resolves the Higgs-sector naturalness problem of the Standard Model in scenarios where supersymmetry is broken at a very high scale.

Background

The text notes that supersymmetry technically solves the hierarchy (naturalness) problem if broken near the weak scale, motivating expectations of superpartners at the LHC. Since the LHC has not (so far) discovered supersymmetry, the author points out that supersymmetry could be broken at a much higher scale, in which case the naturalness problem would need a different resolution.

The author explicitly states that such an alternative resolution would be via an "as yet unknown" mechanism, framing a broad open question in particle physics regarding naturalness in the absence of low-scale supersymmetry.

References

While the above argument was plausible there is nothing wrong with supersymmetry being broken at a very high scale and the problem of naturalness in the standard model is resolved in some other, as yet unknown, way.

— Memories of Abdus Salam and the early days of supersymmetry  (2403.13453 - West, 2024) in Paragraph beginning “As we now know the LHC did not find supersymmetry, at least not so far.” after reference [16] (discussion of naturalness and LHC results)