Spin Structure of the Pion

Journal Article · Fri Sep 19 00:00:00 EDT 2008 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.101.122001· OSTI ID:21179725

Broemmel, D ^[1]; Diehl, M ^[1]; Goeckeler, M; Schaefer, A ^[2]; Haegler, Ph ^[3]; Horsley, R; Zanotti, J M ^[4]; Nakamura, Y; Pleiter, D ^[5]; Rakow, P E. L. ^[6]; Schierholz, G ^[1]; Stueben, H ^[7]

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1. Deutsches Elektronen-Synchrotron DESY, 22603 Hamburg (Germany)
2. Institut fuer Theoretische Physik, Universitaet Regensburg, 93040 Regensburg (Germany)
3. Institut fuer Theoretische Physik T39, Physik-Department der TU Muenchen, 85747 Garching (Germany)
4. School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ (United Kingdom)
5. John von Neumann-Institut fuer Computing NIC/DESY, 15738 Zeuthen (Germany)
6. Department of Mathematical Sciences, University of Liverpool, Liverpool L69 3BX (United Kingdom)
7. Konrad-Zuse-Zentrum fuer Informationstechnik Berlin, 14195 Berlin (Germany)

We present the first calculation of the transverse spin structure of the pion in lattice QCD. Our simulations are based on two flavors of nonperturbatively improved Wilson fermions, with pion masses as low as 400 MeV in volumes up to (2.1 fm){sup 3} and lattice spacings below 0.1 fm. We find a characteristic asymmetry in the spatial distribution of transversely polarized quarks. This asymmetry is very similar in magnitude to the analogous asymmetry we previously obtained for quarks in the nucleon. Our results support the hypothesis that all Boer-Mulders functions are alike.

• OSTI ID: 21179725
• Journal Information: Physical Review Letters, Vol. 101, Issue 12; Other Information: DOI: 10.1103/PhysRevLett.101.122001; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
FLAVOR MODEL
MASS
MEV RANGE 100-1000
NUCLEONS
PIONS
QUANTUM CHROMODYNAMICS
QUARKS
SIMULATION
SPATIAL DISTRIBUTION
SPIN