A mechanism for the Double-Spin Asymmetry in Electromagnetic $\ddot{I}$ Production at HERMES

Abstract

We calculate the contribution of meson and pomeron exchanges to the double-spin asymmetry in $\ddot{I}$-meson electromagnetic production at HERMES energies. We show that the observed double-spin asymmetries, which are large, can be explained by the interference between the natural parity $f_2$-secondary Reggeon and the unnatural parity anomalous $f_1$ exchanges.

7 pages, 3 figures, Latex