Double spin asymmetry in exclusive rho^0 muoproduction at COMPASS

Details Double spin asymmetry in exclusive rho^0 muoproduction at COMPASS Double spin asymmetry in exclusive rho^0 muoproduction at COMPASS

2007-04-14

arxiv.org/abs/0704.1863v2

Eur.Phys.J.C52:255-265,2007

Physics

High Energy Physics

High Energy Physics - Experiment

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

Scientific paper

10.1140/epjc/s10052-007-0376-6

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.

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