GoKawiilLattice QCD calculation pins down strong coupling constant to 0.5% precision
A calculation published in Nature has determined the strong coupling constant, α_s, to an uncertainty of five parts per mille using only low-energy lattice QCD input, independent of collider data. This improves on the previous precision of roughly one part in a hundred for the parameter governing interactions between quarks and gluons. Because the value was derived without fitting to collider measurements, it can be fed directly into predictions for LHC and future collider processes.
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The article notes that α_s uncertainty has become a theoretical bottleneck as LHC measurements reach percent-level precision, meaning imprecise theory inputs could mask or mimic signs of new physics. Harvey Meyer's account suggests that future facilities like the High-Luminosity LHC and FCC-ee will need even sharper coupling values to distinguish genuine deviations from the Standard Model from mere theoretical uncertainty. A collider-independent determination could serve as a cleaner benchmark for testing predictions across many processes, including Higgs production via gluon fusion.
- New lattice QCD calculation reduces strong coupling constant uncertainty to five parts per mille.
- The result relies solely on low-energy inputs, making it independent of LHC collision data.
- Improved precision addresses a bottleneck for interpreting high-precision LHC and future collider measurements.
Source: cerncourier.com, 2026-10-10
Published there as: “How strong is the strong interaction?”
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