Exclusive ${\rho }^0$ Production in Polarized DIS at SMC

Abstract

Preliminary spin cross section asymmetries for exclusive ${\rho }^0$ lepto-production, $\vec{\mu }+\vec{N}\to {\mu }^{\prime }+N+{\rho }^0({\rho }^0\to {\pi }^{+}{\pi }^{-})$, are reported. These asymmetries have been determined for the first time by the Spin Muon Collaboration (SMC) at low Q^2 (photoproduction) and at large Q^2 (DIS) for different $p_T^2$ intervals in the kinematic range $0.01<Q^2<60Ge{V}^2$ and $140<W^2<310Ge{V}^2$ (<W> \simeq 15 GeV) for the full SMC data set. About 100 K ${\rho }^0$'s have been selected for $0.62<m({\pi }^{+}{\pi }^{-})<1.07GeV/c^2$ and $|I|<0.05$. Within the statistical precision, no significant asymmetries have been observed at low $Q^2$ in the preliminary results.

3 pages, LaTeX, 5 eps figures, talk given at DIS99

References in corpus (2)

• Polarised Quark Distributions in the Nucleon from Semi-Inclusive Spin Asymmetries
• Vector-Meson Electroproduction from Generalized Vector Dominance

Cited by in corpus (5)

• The role of the quark and gluon GPDs in hard vector-meson electroproduction
• Vector meson electroproduction at small Bjorken-x and generalized parton distributions
• Transverse target spin asymmetries in exclusive ${\rho }^0$ muoproduction
• Double spin asymmetry in exclusive rho^0 muoproduction at COMPASS
• Double-Spin Asymmetry in the Cross Section for Exclusive rho^0 Production in Lepton-Proton Scattering