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Contribution of orbital angular momentum to the nucleon spin

Maryam Momeni-Feili

Department of Physics, Science and Research Branch, Islamic Azad University, Tehran, Iran

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Firooz Arash

Physics Department, Tafresh University, Tafresh, Iran

E-mail Address: farash@cic.aut.ac.ir

Corresponding author.

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Fatemeh Taghavi-Shahri

Department of Physics, Ferdowsi University of Mashhad, P.O. Box 1436, Mashhad, Iran

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, and

Abolfazl Shahveh

Diamond Light Source Ltd., Diamond House, Herwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, UK

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https://doi.org/10.1142/S0217751X17500361Cited by:1 (Source: Crossref)

Abstract

We have calculated the orbital angular momentum of quarks and gluons in the nucleon. The calculations are carried out in the next to leading order utilizing the so-called valon model. It is found that the average quark orbital angular momentum is positive, but small, and the average gluon orbital angular momentum is negative and large. We also report on some regularities about the total angular momentum of the quarks and the gluon, as well as on the orbital angular momentum of the separate partons. We have also provided partonic angular momentum, $L^{q, g}$ as a function of $Q^{2}$ .

Keywords:

PACS: 12.38.Bx, 13.60.Hb, 13.85.Hd, 13.66.Bc

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