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

Technical Report · Wed Jan 01 04:00:00 EST 1992

OSTI ID:7029908

Burkert, V ^[1]; Li, Z ^[2]

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1. Continuous Electron Beam Accelerator Facility, Newport News, VA (United States)
2. Virginia Polytechnic Inst. and State Univ., Blacksburg, VA (United States)

We study contributions from baryon resonance excitations to the Q{sup 2} dependence of the Gerasimov-Drell-Hearn sum rule. The results indicate that the sum rule at small Q{sup 2} is largely saturated by contribution from the lower mass resonant states. We find a strong Q{sup 2} dependence of the resonant contributions, leading even to a sign change of the sum rule integral at Q{sup 2} {approx equal} O.8GeV{sup 2}. The global Q{sup 2} dependence indicates discrepancies to the interpretation of the EMC polarized structure function data on A{sub 1}{sup p} in the resonance region, which can be largely attributed to the elimination of the P{sub 33}(1232) resonance from the EMC analysis.

• Research Organization: Southeastern Universities Research Association, Inc., Newport News, VA (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC05-84ER40150
• OSTI ID: 7029908
• Report Number(s): DOE/ER/40150-200; CEBAF-PR--92-017; ON: DE93000828
• Country of Publication: United States
• Language: English

Related Subjects

662410* -- Properties of Baryons & Baryon Resonances-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANGULAR MOMENTUM
BARYONS
COMPOSITE MODELS
CROSS SECTIONS
ELEMENTARY PARTICLES
ENERGY-LEVEL TRANSITIONS
EQUATIONS
FERMIONS
FUNCTIONS
HADRONS
M1-TRANSITIONS
MATHEMATICAL MODELS
MULTIPOLE TRANSITIONS
NUCLEONS
PARTICLE MODELS
PARTICLE PROPERTIES
PROTONS
QUARK MODEL
SPIN
STRUCTURE FUNCTIONS
SUM RULES