Eur. Phys. J. A (2007) 31: 606-609
https://doi.org/10.1140/epja/i2006-10175-8

QNP 2006

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

Received: 24 September 2006
Accepted: 1 October 2006
Published online: 16 February 2007

Abstract

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.