Double-spin asymmetries in the cross section of ${\rho }^0$ and $\varphi$ production at intermediate energies

Abstract

Double-spin asymmetries in the cross section of electroproduction of ${\rho }^0$ and $\varphi$ 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 $\varphi$ meson electroproduction by quasi-real photons were also found to be consistent with zero; the asymmetry in the case of the $\varphi$ meson is compatible with a theoretical prediction which involves $s\bar{s}$ knockout from the nucleon.

8 pages, 7 figures

References in corpus (1)

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

Cited by in corpus (10)

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• The role of the quark and gluon GPDs in hard vector-meson electroproduction
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• Deep Electroproduction of Photons and Mesons on the Deuteron
• Spin Density Matrix Elements in Exclusive rho^0 Electroproduction on 1H and 2H Targets at 27.5 GeV Beam Energy
• Transversity in exclusive vector-meson leptoproduction
• Transverse target spin asymmetries in exclusive ${\rho }^0$ muoproduction
• Double spin asymmetry in exclusive rho^0 muoproduction at COMPASS
• Ratios of helicity amplitudes for exclusive ${\rho }^0$ electroproduction on transversely polarized protons