Delta G from Compass

Abstract

Measurements of the gluon polarization $\frac{\Delta G}{G}$ via the open charm channel and based on the helicity asymmetry of large transverse-momentum hadrons in the final state are presented. The data have been collected in the years 2002-2004 by the COMPASS experiment at CERN using a 160 GeV/c polarized muon beam scattered off a polarized ${}^6$LiD target. The new result for $\frac{\Delta G}{G}$ from the charm channel is $-0.57\pm 0.41(stat.)$ at $x_G\simeq 0.15$ and scale ${\mu }^2\simeq 13$ (GeV/c)${}^2$. The gluon polarization from high-$p_T$ hadron pairs is $\frac{\Delta G}{G}=0.016\pm 0.058(stat.)\pm 0.055(syst.)$ at $x_G\simeq 0.085_{-0.035}^{+0.07}$ ($Q^2<1$ (GeV/c)${}^2$ and ${\mu }^2\simeq 3$ (GeV/c)${}^2$)

4 pages, 2 figures, Talk given on XIV Interantional Workshop on DIS, 20-24 April, 2006, Tsukuba, Japan

Cited by in corpus (2)

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