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The CalLat Collaboration have calculated the axial charge of the nucleon with an unprecedented one-percent precision in a study published in Nature. The collaboration, which includes INT Research Associate Chris Monahan and several former graduate students of the UW Department of Physics, used lattice quantum chromodynamics--a numerical method for calculating the underlying physics of quarks and gluons, the subatomic particles that make up protons and neutrons-- to obtain computational results that matched long-standing experimental results. Their method offers a clear path to further improvements that may help to resolve experimental discrepancies in measurements of the lifetime of the neutron.

  • LLNL press release
  • ORNL press release

    The left panel shows the extrapolation to the physical value, the right panel shows a comparison of lattice results and the experimental value.

    This figure shows how the result is extracted from the Euclidean time behaviour of the nucleon correlation function.