The Polarised Valence Quark Distribution from semi-inclusive DIS
| dc.creator | COMPASS Collaboration | |
| dc.creator | Alekseev, M. | |
| dc.date | 2007-07-27 | |
| dc.date | 2007-12-21 | |
| dc.date.accessioned | 2026-07-07T11:18:12Z | |
| dc.date.available | 2026-07-07T11:18:12Z | |
| dc.description | 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. | |
| dc.description | 7 pages, 3 figures, COMPASS, revised: details added, author list updated | |
| dc.identifier | https://arxiv.org/abs/0707.4077 | |
| dc.identifier | http://arxiv.org/abs/0707.4077 | |
| dc.identifier | Phys.Lett.B660:458-465,2008 | |
| dc.identifier | doi:10.1016/j.physletb.2007.12.056 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/193262 | |
| dc.subject | High Energy Physics - Experiment | |
| dc.title | The Polarised Valence Quark Distribution from semi-inclusive DIS | |
| dc.type | text |