Spin structure function of deuteron g1 d from COMPASS
Institute of Nuclear Physics, Mainz University, D-55099, Mainz, Germany
* e-mail: Alexander.Korzenev@cern.ch
Accepted: 1 October 2006
Published online: 16 February 2007
New results on the longitudinal inclusive spin asymmetry A 1 d in the range 1 < Q 2 < 100(GeV/c)^2 and 0.004 < x < 0.7 are presented. From these results we derive the spin-dependent structure function g 1 d which we use to evaluate the scale-invariant flavor-singlet axial charge . The contribution of the measured region is evaluated by a QCD fit of the world data. The data were obtained by the COMPASS experiment at CERN using a 160GeV polarized muon beam scattered off a large double-cell polarized 6LiD target. The results are in agreement with those from previous experiments and improve considerably the statistical accuracy in the region x < 0.03.
PACS: 13.60.Hb Total and inclusive cross-sections (including deep-inelastic processes) – / 13.88.+e Polarization in interactions and scattering –
© Società Italiana di Fisica and Springer-Verlag, 2007