Angular momentum composition of the proton in the quark-parton model

L. M. Sehgal

doi:10.1103/PhysRevD.10.1663

Angular momentum composition of the proton in the quark-parton model

L. M. Sehgal

III. Physikalisches Institut, Technische Hochschule Aachen, Aachen, West Germany
CERN, Geneva, Switzerland

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Phys. Rev. D 10, 1663 – Published 1 September, 1974

DOI: https://doi.org/10.1103/PhysRevD.10.1663

Abstract

Assuming the angular momentum of a polarized proton $J_{Z} = \frac{1}{2}$ to be the resultant of the total spin $S_{Z}$ and total orbital momentum $L_{Z}$ of its parton constituents (quarks and antiquarks), we find $S_{Z} = \frac{1}{2} (3 F - D)$ , $L_{Z} = \frac{1}{2} (1 - 3 F + D)$ . The approzimation employed is the same as that leading to the Ellis-Jaffe sum rules for polarized electron-nucleon scattering. The result for $L_{Z}$ , interpreted geometrically, implies that a polarized proton possesses a significant amount of rotation. On the assumption that $S_{Z}$ and $L_{Z}$ are dominated by $P$ and $N$ quarks, an estimate is made of the separate contribution of these constituents.

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Angular momentum composition of the proton in the quark-parton model

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Angular momentum composition of the proton in the quark-parton model

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