Published June 1, 2009
| Version v1
Journal article
Gluon polarisation in the nucleon and longitudinal double spin asymmetries from open charm muoproduction
Creators
- Alekseev, M.1
- Alexakhin, V.Yu.2
- Alexandrov, Yu.3
- Alexeev, G.D.2
- Amoroso, A.4
- Austregisilio, A.5, 6
- Badelek, B.7
- Balestra, F.4
- Ball, J.8
- Barth, J.9
- Baum, G.10
- Bedfer, Y.8
- Bernhard, J.11
- Bertini, R.4
- Bettinelli, M.12
- Birsa, R.13
- Bisplinghoff, J.14
- Bordalo, P.15
- Bradamante, F.16
- Bravar, A.13
- and others
- 1. University of Eastern Piedmont, 1500 Alessandria, and Torino Section of INFN, 10125 Turin (Italy)
- 2. Joint Institute for Nuclear Research, 141980 Dubna, Moscow region (Russian Federation)
- 3. Lebedev Physical Institute, 119991 Moscow (Russian Federation)
- 4. University of Turin, Department of Physics and Torino Section of INFN, 10125 Turin (Italy)
- 5. Technische Universitaet Muenchen, Physik Department, 85748 Garching (Germany)
- 6. CERN, 1211 Geneva 23 (Switzerland)
- 7. Soltan Institute for Nuclear Studies and University of Warsaw, 00-681 Warsaw (Poland)
- 8. CEA DAPNIA/SPhN Saclay, 91191 Gif-sur-Yvette (France)
- 9. Universitaet Bonn, Physikalisches Institut, 53115 Bonn (Germany)
- 10. Universitaet Bielefeld, Fakultaet fuer Physik, 33501 Bielefeld (Germany)
- 11. Universitaet Mainz, Institut fuer Kernphysik, 55099 Mainz (Germany)
- 12. Ludwig-Maximilians-Universitaet Muenchen, Department fuer Physik, 80799 Munich (Germany)
- 13. Trieste Section of INFN, 34127 Trieste (Italy)
- 14. Universitaet Bonn, Helmholtz-Institut fuer Strahlen- und Kernphysik, 53115 Bonn (Germany)
- 15. LIP, 1000-149 Lisbon (Portugal)
- 16. University of Trieste, Department of Physics and Trieste Section of INFN, 34127 Trieste (Italy)
Description
The gluon polarisation in the nucleon has been determined by detecting charm production via D0 meson decay to charged K and π in polarised muon scattering off a longitudinally polarised deuteron target. The data were taken by the COMPASS Collaboration at CERN between 2002 and 2006 and correspond to an integrated luminosity of 2.8 fb-1. The dominant underlying process of charm production is the photon-gluon fusion to a cc-bar pair. A leading order QCD approach gives an average gluon polarisation of <Δg/g>x=-0.49±0.27(stat)±0.11(syst) at a scale μ2∼13 (GeV/c)2 and at an average gluon momentum fraction ∼0.11. The longitudinal cross-section asymmetry for D0 production is presented in bins of the transverse momentum and the energy of the D0 meson.
Availability note (English)
Available from http://dx.doi.org/10.1016/j.physletb.2009.04.059Additional details
Identifiers
- DOI
- 10.1016/j.physletb.2009.04.059;
- arXiv
- arXiv:0904.3209v2;
- PII
- S0370-2693(09)00474-2;
Publishing Information
- Journal Title
- Physics Letters. Section B
- Journal Volume
- 676
- Journal Issue
- 1-3
- Journal Page Range
- p. 31-38
- ISSN
- 0370-2693
- CODEN
- PYLBAJ
INIS
- Country of Publication
- Netherlands
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 41055306
- Subject category
- S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
- Descriptors DEI
- ASYMMETRY; CERN; COMPASS-D TOKAMAK; CROSS SECTIONS; D NEUTRAL MESONS; DEUTERIUM TARGET; GEV RANGE; GLUONS; LEPTONIC DECAY; LUMINOSITY; MUONS; NUCLEONS; PHOTONS; POLARIZATION; QUANTUM CHROMODYNAMICS; SCATTERING; SPIN; TRANSVERSE MOMENTUM
- Descriptors DEC
- ANGULAR MOMENTUM; BARYONS; BASIC INTERACTIONS; BOSONS; CHARM PARTICLES; CHARMED MESONS; CLOSED PLASMA DEVICES; D MESONS; DECAY; ELEMENTARY PARTICLES; ENERGY RANGE; FERMIONS; FIELD THEORIES; HADRONS; INTERACTIONS; INTERNATIONAL ORGANIZATIONS; LEPTONS; LINEAR MOMENTUM; MASSLESS PARTICLES; MESONS; OPTICAL PROPERTIES; PARTICLE DECAY; PARTICLE PROPERTIES; PHYSICAL PROPERTIES; PSEUDOSCALAR MESONS; QUANTUM FIELD THEORY; TARGETS; THERMONUCLEAR DEVICES; TOKAMAK DEVICES; WEAK INTERACTIONS; WEAK PARTICLE DECAY
Optional Information
- Copyright
- Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.