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

Technical Report · Thu Oct 01 00:00:00 EDT 1992

OSTI ID:10185974

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: USDOE, Washington, DC (United States)
• DOE Contract Number: AC05-84ER40150
• OSTI ID: 10185974
• Report Number(s): DOE/ER/40150-200; CEBAF-PR-92-017; ON: DE93000828
• Resource Relation: Other Information: PBD: [1992]
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
SUM RULES
STRUCTURE FUNCTIONS
QUARK MODEL
PROTONS
SPIN
CROSS SECTIONS
M1-TRANSITIONS
662410
PROPERTIES OF BARYONS AND BARYON RESONANCES