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.

arXiv comment6 Figures, 15 pages, version 2 with updated author list, technical latex problem fixed

References in corpus (20)

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• The COMPASS Experiment at CERN
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• Nucleon Tensor Charge from Exclusive ${\pi }^o$ Electroproduction
• QCD factorization of exclusive processes beyond leading twist: gamma*T -> rhoT impact factor with twist three accuracy
• The Hadronic Final State at HERA
• A phenomenological study of helicity amplitudes of high energy exclusive leptoproduction of the rho meson
• Transverse target spin asymmetries in exclusive ${\rho }^0$ muoproduction
• Exclusive rho^0 muoproduction on transversely polarised protons and deuterons
• Prospects for quarkonium studies at the high-luminosity LHC
• Exclusive $\omega$ meson muoproduction on transversely polarised protons
• ΔG/G results from the COMPASS experiment for Q^2 > 1 GeV^2, using high p_T hadrons
• Study of the Transverse-Momentum-Dependent structure of the nucleon in Semi-Inclusive DIS
• Electroproduction of Light Vector Mesons
• Generelized Parton Distributions in light meson production
• Why there is no crisis of the "spin crisis"