Measuring $F_L(x,Q^2)\mathrm{/}{F}_2(x,Q^2)$ from Azimuthal Asymmetries in Deep Inelastic Scattering

We demonstrate that the angular distribution of hadrons produced in semi-inclusive deep inelastic final states is related to the inclusive longitudinal structure function. This relation could provide a new method of accessing $F_L(x,Q^2)$ in deep inelastic scattering measurements.