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| Article | |
| Title | Determination of the gluon contribution to the nucleon spin with COMPASS |
| Author(s) | Platchkov, Stephane (DSM, DAPNIA, Saclay) |
| Collaboration | on behalf of the COMPASS Collaboration |
| Publication | 2006 |
| Number of pages | 6 |
| In: | Nucl. Phys. A 790 (2007) 58c-63c |
| In: | 18th International IUPAP Conference on Few-Body Problems in Physics, Sao Paulo, Brazil, 21 - 26 Aug 2006, pp.58c-63c |
| DOI | 10.1016/j.nuclphysa.2007.03.162 |
| Subject category | Particle Physics - Experiment |
| Accelerator/Facility, Experiment | CERN SPS ; COMPASS NA58 |
| Abstract | New double-spin asymmetry data from the COMPASS experiment at CERN are presented. The data are used to determine the polarized gluon distribution $\Delta G/G(x)$, via three different techniques. Next-to-leading order QCD fits to the nucleon polarized structure functions indicate that the first moment of $\Delta G/G(x)$ is small (either positive or negative) and compatible with zero. This observation is corroborated by three measurements of $\Delta G/G(x), based on the photon-gluon fusion process. |