Angular momentum composition of the proton in the quark-parton model
- 1 September 1974
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 10 (5), 1663-1665
- https://doi.org/10.1103/physrevd.10.1663
Abstract
Assuming the angular momentum of a polarized proton to be the resultant of the total spin and total orbital momentum of its parton constituents (quarks and antiquarks), we find , . The approzimation employed is the same as that leading to the Ellis-Jaffe sum rules for polarized electron-nucleon scattering. The result for , interpreted geometrically, implies that a polarized proton possesses a significant amount of rotation. On the assumption that and are dominated by and quarks, an estimate is made of the separate contribution of these constituents.
Keywords
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