Quark orbital angular momentum from lattice QCD
Journal Article
·
· Physical Review D
We calculate the quark orbital angular momentum of the nucleon from the quark energy-momentum tensor form factors on the lattice with the quenched approximation. The disconnected insertion is estimated stochastically which employs the Z{sub 2} noise with an unbiased subtraction. This reduced the error by a factor of 3--4 with negligible overhead. The total quark contribution to the proton spin is found to be 0.30{+-}0.07. From this and the quark spin content we deduce the quark orbital angular momentum to be 0.17{+-}0.06 which is {approx}34% of the proton spin. We further predict that the gluon angular momentum is 0.20{+-}0.07; i.e., {approx}40% of the proton spin is due to the glue.
- Sponsoring Organization:
- (US)
- OSTI ID:
- 40205220
- Journal Information:
- Physical Review D, Vol. 62, Issue 11; Other Information: DOI: 10.1103/PhysRevD.62.114504; Othernumber: PRVDAQ000062000011114504000001; 033023PRD; PBD: 1 Dec 2000; ISSN 0556-2821
- Publisher:
- The American Physical Society
- Country of Publication:
- United States
- Language:
- English
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