Do gluons carry half of the nucleon momentum?

We examine the conventional picture that gluons carry about half of the nucleon momentum in the asymptotic limit. We show that this large fraction is due to an unsuitable definition of the gluon momentum in an interacting theory. If defined in a gauge-invariant and consistent way, the asymptotic glu...

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Published in:Physical review letters 2009-08, Vol.103 (6), p.062001-062001, Article 062001
Main Authors: Chen, Xiang-Song, Sun, Wei-Min, Lü, Xiao-Fu, Wang, Fan, Goldman, T
Format: Article
Language:English
Subjects:
ANGULAR MOMENTUM
ASYMPTOTIC SOLUTIONS
BARYONS
BOSONS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
DISTRIBUTION FUNCTIONS
ELEMENTARY PARTICLES
FERMIONS
FUNCTIONS
GAUGE INVARIANCE
GLUONS
HADRONS
INVARIANCE PRINCIPLES
MATHEMATICAL SOLUTIONS
NUCLEONS
PARTICLE PROPERTIES
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
SPIN
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cited_by cdi_FETCH-LOGICAL-c403t-b8ab28fc3522dcad9c034f73db3fd0c0d91ec00cb4f1ef77da683ee336a2fd63
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container_issue 6
container_start_page 062001
container_title Physical review letters
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creator Chen, Xiang-Song
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description We examine the conventional picture that gluons carry about half of the nucleon momentum in the asymptotic limit. We show that this large fraction is due to an unsuitable definition of the gluon momentum in an interacting theory. If defined in a gauge-invariant and consistent way, the asymptotic gluon momentum fraction is computed to be only about one-fifth. This result suggests that the asymptotic limit of the nucleon spin structure should also be reexamined. A possible experimental test of our finding is discussed in terms of novel parton distribution functions.
doi_str_mv 10.1103/physrevlett.103.062001
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ispartof Physical review letters, 2009-08, Vol.103 (6), p.062001-062001, Article 062001
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1079-7114
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source American Physical Society:Jisc Collections:APS Read and Publish 2023-2025 (reading list)
subjects ANGULAR MOMENTUM
ASYMPTOTIC SOLUTIONS
BARYONS
BOSONS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
DISTRIBUTION FUNCTIONS
ELEMENTARY PARTICLES
FERMIONS
FUNCTIONS
GAUGE INVARIANCE
GLUONS
HADRONS
INVARIANCE PRINCIPLES
MATHEMATICAL SOLUTIONS
NUCLEONS
PARTICLE PROPERTIES
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
SPIN
title Do gluons carry half of the nucleon momentum?
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