Extraction of Gluon Momentum, Spin, Parity, and Coupling fromγ*N→ψNData

Abstract

The unique ability of heavy-quark leptoproduction to probe constituent gluons is exploited. From recent ${\gamma }^{*}N\to \psi N$ data, the gluon distribution ${\eta }^{-1\mathrm{}}{(1-\eta )}^p$, $p={5.6}_{-1.2\mathrm{}}^{+0.8\mathrm{}}$, is extracted and $\frac{{\alpha }_s}{\pi }$ is inferred. It is shown that measurement of $\frac{{\sigma }_L}{{\sigma }_T}$ as a function of $Q^2$ for charm production can determine the gluon spin and parity.