Kaon and pion parton distributions

Beginning with results for the leading-twist twoparticle distribution amplitudes of p- and K-mesons, each of which exhibits dilation driven by the mechanism responsible for the emergence of hadronic mass, we develop parameterfree predictions for the pointwise behaviour of all p and K distribution functions (DFs), including glue and sea. The large-x behaviour of each DF meets expectations based on quantum chromodynamics; the valence-quark distributions match extractions from available data, including the pion case when threshold resummation effects are included; and at.5 = 5.2GeV, the scale of existing measurements, the light-front momentum of these hadrons is shared as follows: (xvalence)(p) = 0.41(4), (x(glue))(p) = 0.45(2), (x(sea))(p) = 0.14(2); and (x(valence))(K) = 0.42(3), (x(glue))(K) = 0.44(2), (x(sea))(K) = 0.14(2). The kaon's glue and sea distributions are similar to those in the pion, although the inclusion of mass-dependent splitting functions introduces some differences on the valence-quark domain. This study should stimulate improved analyses of existing data and motivate new experiments sensitive to all p and K DFs. With little known empirically about the structure of the Standard Model's