Double spin asymmetry in exclusive rho^0 muoproduction at COMPASS

Abstract

The longitudinal double spin asymmetry A_1^rho for exclusive leptoproduction of rho^0 mesons, mu + N -> mu + N + rho, is studied using the COMPASS 2002 and 2003 data. The measured reaction is incoherent exclusive rho^0 production on polarised deuterons. The Q^2 and x dependence of A_1^rho is presented in a wide kinematical range: 3x10^-3 < Q^2 < 7 (GeV/c)^2 and 5x10^-5 < x < 0.05. The presented results are the first measurements of A_1^rho at small Q2 (Q2 < 0.1 (GeV/c)^2) and small x (x < 3x10^-3). The asymmetry is in general compatible with zero in the whole kinematical range.

6 Figures, 15 pages, version 2 with updated author list, technical latex problem fixed

References in corpus (4)

• The COMPASS Experiment at CERN
• The Deuteron Spin-dependent Structure Function g1d and its First Moment
• Spin asymmetry A_1^d and the spin-dependent structure function g_1^d of the deuteron at low values of x and Q^2
• Diffractive production of vector mesons in Deep Inelastic Scattering within k_t-factorization approach

Cited by in corpus (3)

• Nucleon Tensor Charge from Exclusive ${\pi }^o$ Electroproduction
• Electroproduction of Light Vector Mesons
• Study of the Transverse-Momentum-Dependent structure of the nucleon in Semi-Inclusive DIS