Gottfried sum rule and the light-flavor content of the nucleon

Journal Article · Mon Mar 01 04:00:00 EST 1993 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.47.1842· OSTI ID:6820075

Forte, S ^[1]

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1. Istituto Nazionale di Fisica Nucleare, Sezione di Torino, via P. Giuria 1, I-10125 Torino (Italy)

We discuss the implications for the light-flavor content of the nucleon of the recent experimental results of the New Muon Collaboration (NMC) on the Gottfried sum rule. We perform a phenomenological analysis of the data and of the symmetries of the quark sea in the nucleon. We show that a discrepancy between the data and naive parton model expectations as seen in the NMC data is also indicated by measurements of the nucleon [sigma] term. We compute the isotriplet value of the [sigma] term through the flavor-singlet scale Ward identity, and we use the result to fix the light-flavor content of the nucleon. We discuss the possibility of reproducing the experimental results in various theoretical frameworks, both within effective models of the nucleon and on the basis of perturbative or nonperturbative QCD.

• OSTI ID: 6820075
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 47:5; ISSN 0556-2821; ISSN PRVDAQ
• Country of Publication: United States
• Language: English

Related Subjects

662230* -- Quantum Chromodynamics-- (1992-)
662410 -- Properties of Baryons & Baryon Resonances-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
CHARGED PARTICLES
COMPOSITE MODELS
DEUTERONS
ELEMENTARY PARTICLES
EQUATIONS
FERMIONS
FIELD THEORIES
FLAVOR MODEL
FUNCTIONS
HADRONS
ISOSPIN
MATHEMATICAL MODELS
MATTER
NUCLEONS
PARTICLE MODELS
PARTICLE PROPERTIES
PARTON MODEL
PERTURBATION THEORY
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARK MATTER
QUARK MODEL
STRUCTURE FUNCTIONS
SUM RULES
VALENCE
WARD IDENTITY