Proton spin content from lattice QCD

Nilmani Mathur, S. J. Dong, K. F. Liu, N. C. Mukhopadhyay

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

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 languageEnglish
Pages (from-to)247-249
Number of pages3
JournalNuclear Physics B - Proceedings Supplements
Volume83-84
Issue number1-3
DOIs
StatePublished - 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.

FundersFunder number
National Science Foundation (NSF)
Michigan State University-U.S. Department of Energy (MSU-DOE) Plant Research LaboratoryDE-FG05-84ER40154, DE-FG02-88ER40448
Directorate for Mathematical and Physical Sciences9722073

    ASJC Scopus subject areas

    • Atomic and Molecular Physics, and Optics
    • Nuclear and High Energy Physics

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