Double-spin asymmetries in the cross section of $ρ^0$ and $φ$ production at intermediate energies

Details Double-spin asymmetries in the cross section of $ρ^0$ and $φ$ production at intermediate energies Double-spin asymmetries in the cross section of $ρ^0$ and $φ$ production at intermediate energies

2003-02-10

arxiv.org/abs/hep-ex/0302012v2

Eur.Phys.J.C29:171-179,2003

Physics

High Energy Physics

High Energy Physics - Experiment

8 pages, 7 figures

Scientific paper

10.1140/epjc/s2003-01232-3

Double-spin asymmetries in the cross section of electroproduction of $\rho^0$ and $\phi$ mesons on the proton and deuteron are measured at the HERMES experiment. The photoabsorption asymmetry in exclusive $\rho^0$ electroproduction on the proton exhibits a positive tendency. This is consistent with theoretical predictions that the exchange of an object with unnatural parity contributes to exclusive $\rho^0$ electroproduction by transverse photons. The photoabsorption asymmetry on the deuteron is found to be consistent with zero. Double-spin asymmetries in $\rho^0$ and $\phi $ meson electroproduction by quasi-real photons were also found to be consistent with zero; the asymmetry in the case of the $\phi$ meson is compatible with a theoretical prediction which involves $s\bar{s}$ knockout from the nucleon.

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