What do we know about the [ital Q][sup 2] evolution of the Gerasimov-Drell-Hearn sum rule

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

DOI:https://doi.org/10.1103/PhysRevD.47.46· OSTI ID:6890250

Burkert, V ^[1]; Li, Z ^[2]

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1. Continuous Electron Beam Accelerator Facility, Newport News, Virginia 23606 (United States)
2. Physics Department, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24601 (United States)

We study contributions from baryon resonance excitations to the [ital Q][sup 2] dependence of the Gerasimov-Drell-Hearn sum rule. The results indicate that the sum rule at small [ital Q][sup 2] is largely saturated by contributions from the lower mass resonant states. We find a strong [ital Q][sup 2] dependence of the resonant contributions, leading even to a sign change of the sum rule integral at [ital Q][sup 2][congruent]0.8 GeV[sup 2]. The global [ital Q][sup 2] dependence indicates discrepancies to the interpretation of the European Muon Collaboration polarized structure function data on [ital A][sub 1][sup [ital p]] in the resonance region.

• OSTI ID: 6890250
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 47:1; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

662330* -- Photon & Charged-Lepton Interactions with Hadrons-- (1992)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
BASIC INTERACTIONS
CROSS SECTIONS
CURRENT ALGEBRA
DEEP INELASTIC SCATTERING
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
EMC EFFECT
EQUATIONS
FERMIONS
FUNCTIONS
HADRONS
HELICITY
INELASTIC SCATTERING
INTERACTIONS
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
MAGNETIC MOMENTS
NUCLEONS
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
PHOTON-BARYON INTERACTIONS
PHOTON-HADRON INTERACTIONS
PHOTON-NUCLEON INTERACTIONS
PHOTON-PROTON INTERACTIONS
POLARIZED TARGETS
PROTONS
SCATTERING
STRUCTURE FUNCTIONS
SUM RULES
TARGETS
TESTING