Nucleon spin structure at low momentum transfers
2010 (English)In: Physical Review D. Particles and fields, ISSN 0556-2821, E-ISSN 1089-4918, Vol. 82, no 7, 076007- p.Article in journal (Refereed) Published
The generalized Gerasimov-Drell-Hearn sum rule is known to be very sensitive to QCD radiative and power corrections. We improve the previously developed QCD-inspired model for the Q(2) dependence of the Gerasimov-Drell-Hearn sum rule. We take into account higher order radiative and higher-twist power corrections extracted from precise Jefferson Lab data on the lowest moment of the spin-dependent proton structure function Gamma(p)(1)(Q(2)) and on the Bjorken sum rule Gamma(p-n)(1)(Q(2)). By using the singularity-free analytic perturbation theory we demonstrate that the matching point between chiral-like positive-Q(2) expansion and QCD operator product 1/Q(2) expansion for the nucleon spin sum rules can be shifted down to rather low Q similar or equal to Lambda(QCD) leading to a good description of recent proton, neutron, deuteron, and Bjorken sum rule data at all accessible Q(2).
Place, publisher, year, edition, pages
2010. Vol. 82, no 7, 076007- p.
IdentifiersURN: urn:nbn:se:uu:diva-133585DOI: 10.1103/PhysRevD.82.076007ISI: 000283294700006OAI: oai:DiVA.org:uu-133585DiVA: diva2:370248