A mechanism for the Double-Spin Asymmetry in Electromagnetic $ρ$ Production at HERMES

N. I. Kochelev, D. -P. Min, V. Vento, A. V. Vinnikov

Published 2001-12-21, updated 2001-12-22Version 2

We calculate the contribution of meson and pomeron exchanges to the double-spin asymmetry in $\rho$-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.