DIS structure functions and the double-spin asymmetry in $\rho^0$ electroproduction within a Regge approach

The proton, neutron and deuteron structure functions F 2 ( x,Q 2 ) and g 1 ( x,Q 2 ), measured at intermediate Q 2 , are analyzed within a Regge approach. This analysis serves to fix the parameters of this scheme which are then used to calculate, in a unified Regge approach, the properties of ρ 0 meson electroproduction on the proton and the deuteron. In this way, the double-spin asymmetry observed at HERMES in ρ 0 electroproduction on the proton, can be related to the anomalous behavior of the flavor-singlet part of the spin-dependent structure function g 1 ( x, Q 2 ) at small x . The proton, neutron and deuteron stru ture fun tions F2(x;Q 2 ) and g1(x;Q 2 ), measured at intermediate Q 2 , are analyzed within a Regge approa h. This analysis serves to (cid:12)x the parameters of this s heme whi h are then used to al ulate, in a uni(cid:12)ed Regge approa h, the properties of (cid:26) 0 meson ele troprodu tion on the proton and the deuteron. In this way, the double-spin asymmetry observed at HERMES in (cid:26) 0 ele troprodu tion on the proton, an be related to the anomalous behavior of the (cid:13)avor-singlet part of the spin-dependent stru ture fun tion g1(x;Q 2 ) at small x.