Measurement of the Gluon Polarization {delta}g/g from Open Charm at COMPASS

Journal Article · Tue Aug 04 00:00:00 EDT 2009 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3215656· OSTI ID:21316920

Kunne, Fabienne ^[1]

---

1. IRFU SPhN, CEA Saclay, F91191 Gif/Yvette (France)

We have measured the gluon polarization in the nucleon by detecting charm production via D{sup 0} meson decay to charged K and {pi} in polarized muon scattering off a longitudinally polarized deuteron target. The dominant process for charm production is the photon gluon fusion into a charm anti-charm quark pair. By using all deuteron statistics from COMPASS accumulated between 2002 and 2006, we extract double spin asymmetries in bins of the transverse momentum and the energy of the D{sup 0} meson and we perform a leading order analysis of the data to extract the gluon polarization <{delta}g/g> = -0.49{+-}0.27(stat){+-}0.11(syst) at a Quantum Chromodynamics (QCD) scale {mu}{sup 2} = 13 GeV{sup 2} and at a gluon momentum fraction <x> = 0.11.

• OSTI ID: 21316920
• Journal Information: AIP Conference Proceedings, Vol. 1149, Issue 1; Conference: 18. international spin physics symposium, Charlottesville, VA (United States), 6-11 Oct 2008; Other Information: DOI: 10.1063/1.3215656; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
D NEUTRAL MESONS
DEUTERIUM TARGET
GLUONS
KAONS MINUS
KAONS PLUS
MULTIPARTICLE SPECTROMETERS
MUON REACTIONS
PARTICLE DECAY
PARTICLE IDENTIFICATION
PARTICLE PRODUCTION
PIONS MINUS
PIONS PLUS
POLARIZATION
QUANTUM CHROMODYNAMICS
QUARKS
SPIN
TRANSVERSE MOMENTUM