Abstract
We calculate the form factor of the quark energy momentum tensor and thereby extract the quark orbital angular momentum of the nucleon. The calculation is done on a quenched 163 × 24 lattice at β = 6.0 and with Wilson fermions at κ = 0.148, 0.152, 0.154 and 0.155. We calculate the disconnected insertion stochastically which employs the Z2 noise with an unbiased subtraction. This proves to be an efficient method of reduce the error from the noise. We find that the total quark contribution to the proton spin is 0.29 ± 0.07. From this we deduce that the quark orbital angular momentum is 0.17 ± 0.08 and predict the gluon spin to be 0.21 ± 0.07, i.e. about 40% of the proton spin is due to the glue.
Original language | English |
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Pages (from-to) | 247-249 |
Number of pages | 3 |
Journal | Nuclear Physics B - Proceedings Supplements |
Volume | 83-84 |
Issue number | 1-3 |
DOIs | |
State | Published - Mar 2000 |
Bibliographical note
Funding Information:This work is partially supported by DOE Grant No. DE-FG05-84ER40154, DE-FG02-88ER40448 and NSF Grant No. 9722073.
Funding
This work is partially supported by DOE Grant No. DE-FG05-84ER40154, DE-FG02-88ER40448 and NSF Grant No. 9722073.
Funders | Funder number |
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National Science Foundation (NSF) | |
Michigan State University-U.S. Department of Energy (MSU-DOE) Plant Research Laboratory | DE-FG05-84ER40154, DE-FG02-88ER40448 |
Directorate for Mathematical and Physical Sciences | 9722073 |
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Nuclear and High Energy Physics