  Strangeness was discovered roughly seventy years ago, lodged in a particle
now known as the kaon, $K$. Kindred to the pion, $\pi$; both states are
massless in the absence of Higgs-boson couplings. Kaons and pions are Nature's
most fundamental Nambu-Goldstone modes. Their properties are largely determined
by the mechanisms responsible for emergent mass in the standard model, but
modulations applied by the Higgs are crucial to Universe evolution. Despite
their importance, little is known empirically about $K$ and $\pi$ structure.
This study delivers the first parameter-free predictions for all $K$
distribution functions (DFs) and comparisons with the analogous $\pi$
distributions, i.e. the one-dimensional maps that reveal how the light-front
momentum of these states is shared amongst the gluons and quarks from which
they are formed. The results should stimulate improved analyses of existing
data and motivate new experiments sensitive to all $K$ and $\pi$ DFs.

High Energy Physics - Phenomenology;High Energy Physics - Experiment;High Energy Physics - Lattice;Nuclear Experiment;Nuclear Theory