Anomalous Evolution of Nonsinglet Structure Functions
arXiv:hep-ph/9409249 · doi:10.1016/0920-5632(95)00037-A
Abstract
We review a formalism that includes the effects of nonperturbative U(1) symmetry breaking on the QCD evolution of nonsinglet structure functions. We show that a strong scale dependence is generated in an intermediate energy range $0.5 \lsim Q^2 \lsim 5$~GeV$^2$ for all values of $x$. We show that this explains naturally the observed violation of the Gottfried sum, and allows a determination of the shape of the nonsinglet structure function, in excellent agreement with experiment. We argue that these effects may affect the determination of $α_s$ from deep--inelastic scattering.
7 pages, 5 figures included as three compressed .ps files, plain LATEX, CERN-TH.7436/94 technical glitch fixed