Sign change of the moment at n=0 of the polarized structure function g{sub 1}{sup p}

Journal Article · Sat Oct 01 00:00:00 EDT 2005 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.72.045205· OSTI ID:20699085

Koretune, Susumu ^[1]

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1. Department of Physics, Shimane University, Matsue, Shimane, 690-8504 (Japan)

The sum rule for the structure function g{sub 1}{sup p} which is related to the cross section of photoproduction is used to show that a sign change of the integral corresponding to the appropriately defined moment at n=0 where the integral is cut at the point x=x{sub c}(Q{sup 2}) occurs at very small Q{sup 2} near Q{sup 2}{approx}0.09 (GeV/c){sup 2} and x{sub c}{approx}0.024. This fact shows that the origin of the sign difference between the Ellis-Jaffe sum rule and the Drell-Hearn-Gerasimov sum rule lies in the rapid change of the elastic contribution at low Q{sup 2} which is compensated by the inelastic contribution to satisfy the sum rule at n=0. Hence it occurs at very small Q{sup 2}.

• OSTI ID: 20699085
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 72, Issue 4; Other Information: DOI: 10.1103/PhysRevC.72.045205; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CROSS SECTIONS
FOUR MOMENTUM TRANSFER
GEV RANGE
PHOTONUCLEAR REACTIONS
PHOTOPRODUCTION
POLARIZATION
STRUCTURE FUNCTIONS
SUM RULES