Published November 2017 | Version v1
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The nucleon spin and momentum decomposition using lattice QCD simulations

Creators

  • 1. Cyprus Univ., Nicosia (Cyprus). Dept. of Physics
  • 2. The Cyprus Institute, Nicosia (Cyprus). Computation-based Science and Technology Research Center
  • 3. Temple Univ., Philadelphia, PA (United States). Dept. of Physics
  • 4. Deutsches Elektronen-Synchrotron (DESY), Zeuthen (Germany). John von Neumann-Inst. fuer Computing NIC
  • 5. Utah Univ., Salt Lake City, UT (United States). Dept. of Physics and Astronomy

Description

We determine within lattice QCD, the nucleon spin carried by valence and sea quarks, and gluons. The calculation is performed using an ensemble of gauge configurations with two degenerate light quarks with mass fixed to approximately reproduce the physical pion mass. We find that the total angular momentum carried by the quarks in the nucleon is Ju+d+s=0.408(61)stat.(48)syst. and the gluon contribution is Jg=0.133(11)stat.(14)syst. giving a total of JN=0.54(6)stat.(5)syst. consistent with the spin sum. For the quark intrinsic spin contribution we obtain (1)/(2)ΔΣu+d+s=0.201(17)stat.(5)syst. All quantities are given in the MS scheme at 2 GeV. The quark and gluon momentum fractions are also computed and add up to left angle x right angle u+d+s+ left angle x right angle g=0.804(121)stat.(95)syst.+0.267(12)stat.(10)syst.=1.07(12) stat.(10)syst. satisfying the momentum sum.

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Additional details

Publishing Information

Imprint Pagination
6 p.
ISSN
0418-9833
Report number
DESY--17-086

INIS

Country of Publication
Germany
Country of Input or Organization
Germany
INIS RN
49034076
Subject category
S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
Descriptors DEI
COLOR MODEL; COMPUTERIZED SIMULATION; GLUON MODEL; LATTICE FIELD THEORY; MATRIX ELEMENTS; NUCLEONS; PARTICLE STRUCTURE; QUANTUM CHROMODYNAMICS; SPIN; SPIN ORIENTATION
Descriptors DEC
ANGULAR MOMENTUM; BARYONS; COMPOSITE MODELS; CONSTRUCTIVE FIELD THEORY; ELEMENTARY PARTICLES; FERMIONS; FIELD THEORIES; HADRONS; MATHEMATICAL MODELS; ORIENTATION; PARTICLE MODELS; PARTICLE PROPERTIES; QUANTUM FIELD THEORY; QUARK MODEL; SIMULATION