Quark Structure of the Nucleon and Angular Asymmetry of Proton-Neutron Hard Elastic Scattering

Journal Article · Fri Nov 20 04:00:00 EST 2009 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.103.212001· OSTI ID:21370849

Granados, Carlos G; Sargsian, Misak M ^[1]

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1. Florida International University, Miami, Florida 33199 (United States)

We investigate an asymmetry in the angular distribution of hard elastic proton-neutron scattering with respect to the 90 deg. center of mass scattering angle and demonstrate that it's magnitude is related to the helicity-isospin symmetry of the quark wave function of the nucleon. Our estimate of the asymmetry within the quark-interchange model of hard scattering demonstrates that the quark wave function of a nucleon based on the exact SU(6) symmetry predicts an angular asymmetry opposite to that of experimental observations. We found that the quark wave function based on the diquark picture of the nucleon produces a correct asymmetry. Comparison with the data allowed us to show that the vector diquarks contribute around 10% in the nucleon wave function and they are in negative phase relative to the scalar diquarks. These observations are essential in constraining QCD models of a nucleon.

• OSTI ID: 21370849
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 21 Vol. 103; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANGULAR DISTRIBUTION
ASYMMETRY
BARYON-BARYON INTERACTIONS
BARYONS
CENTER-OF-MASS SYSTEM
COMPARATIVE EVALUATIONS
DISTRIBUTION
ELASTIC SCATTERING
ELEMENTARY PARTICLES
EVALUATION
FERMIONS
FIELD THEORIES
FUNCTIONS
HADRON-HADRON INTERACTIONS
HADRONS
HELICITY
INTERACTIONS
ISOSPIN
LIE GROUPS
NEUTRONS
NUCLEON-NUCLEON INTERACTIONS
NUCLEONS
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
PROTON-NEUTRON INTERACTIONS
PROTON-NUCLEON INTERACTIONS
PROTONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARKS
SCATTERING
SU GROUPS
SU-6 GROUPS
SYMMETRY
SYMMETRY GROUPS
WAVE FUNCTIONS