Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2007-07-27
Phys.Lett.B660:458-465,2008
Physics
High Energy Physics
High Energy Physics - Experiment
7 pages, 3 figures, COMPASS, revised: details added, author list updated
Scientific paper
10.1016/j.physletb.2007.12.056
The semi-inclusive difference asymmetry A^{h^{+}-h^{-}} for hadrons of opposite charge has been measured by the COMPASS experiment at CERN. The data were collected in the years 2002-2004 using a 160 GeV polarised muon beam scattered off a large polarised ^6LiD target and cover the range 0.006 < x < 0.7 and 1 < Q^2 < 100 (GeV/c)^2. In leading order QCD (LO) the asymmetry A_d^{h^{+}-h^{-}} measures the valence quark polarisation and provides an evaluation of the first moment of Delta u_v + Delta d_v which is found to be equal to 0.40 +- 0.07 (stat.) +- 0.05 (syst.) over the measured range of x at Q^2 = 10 (GeV/c)^2. When combined with the first moment of g_1^d previously measured on the same data, this result favours a non-symmetric polarisation of light quarks Delta u-bar = - Delta d-bar at a confidence level of two standard deviations, in contrast to the often assumed symmetric scenario Delta u-bar = Delta d-bar = Delta s-bar = Delta s.
Alekseev M.
COMPASS Collaboration
No associations
LandOfFree
The Polarised Valence Quark Distribution from semi-inclusive DIS does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Polarised Valence Quark Distribution from semi-inclusive DIS, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Polarised Valence Quark Distribution from semi-inclusive DIS will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-271678