New Approach to Relations Between Deep-Inelastic Structure Functions

Abstract

It is argued that symmetry properties available from experiments outside deep-inelastic physics can provide guidance for understanding the structure functions in the deep-inelastic region. In particular, it is suggested that the component of the current that transforms like the "$\ensuremath{\varphi}$" is more weakly coupled to nonstrange hadrons than the components which transform like the "$\ensuremath{\rho}$" or "$\ensuremath{\omega}$" This leads to a stringent upper bound for the sum of the electromagnetic structure functions, ${F}_{2}^{\ensuremath{\gamma}p}+{F}_{2}^{\ensuremath{\gamma}n}$, which can be tested by experiments.