Published September 11, 1995
| Version v1
Journal article
Proton spin structure from lattice QCD
- 1. Institute of Physics, University of Tsukuba, Tsukuba, Ibaraki 305 (Japan)
- 2. National Laboratory for High Energy Physics (KEK), Tsukuba, Ibaraki 305 (Japan)
- 3. Yukawa Institute, Kyoto University, Kyoto 606 (Japan)
Description
A lattice QCD calculation of the proton matrix element of the flavor singlet axial-vector current is reported. Both the connected and disconnected contributions are calculated, for the latter employing the variant method of wall source without gauge fixing. From simulations in quenched QCD with the Wilson quark action on a 163x20 lattice at β=5.7 (the lattice spacing a∼0.14 fm), we find ΔΣ=Δu+Δd+Δs=+0.638(54)-0.347(46)-0.109(30)=+0.18(10) with the disconnected contribution to Δu and Δd equal to -0.119(44), which is reasonably consistent with the experiment
Additional details
Publishing Information
- Journal Title
- Physical Review Letters
- Journal Volume
- 75
- Journal Issue
- 11
- Journal Page Range
- p. 2092-2095.
- ISSN
- 0031-9007
- CODEN
- PRLTAO
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 27057770
- Subject category
- S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
- Descriptors DEI
- AXIAL-VECTOR CURRENTS; FLAVOR; LATTICE FIELD THEORY; MATRIX ELEMENTS; PROTONS; QUANTUM CHROMODYNAMICS; QUARKS; SPIN
- Descriptors DEC
- ALGEBRAIC CURRENTS; ANGULAR MOMENTUM; BARYONS; CATIONS; CHARGED PARTICLES; CONSTRUCTIVE FIELD THEORY; CURRENTS; ELEMENTARY PARTICLES; FERMIONS; FIELD THEORIES; HADRONS; HYDROGEN IONS; HYDROGEN IONS 1 PLUS; IONS; NUCLEONS; ORGANOLEPTIC PROPERTIES; PARTICLE PROPERTIES; QUANTUM FIELD THEORY