منابع مشابه
The Gdh Sum Rule for the Deuteron
As first topic, the GDH sume rule is discussed in the context of a more general class of sum rules associated with the various contributions to the total photoabsorption cross section for target and beam polarization. Then I address the question of whether the GDH sum rule for the neutron can be determined from the one for the deuteron. It appears that this will not be possible in a simple mann...
متن کاملContributions of vector meson photoproduction to GDH sum rule
An improved version of a recently developed quark model approach to vector meson photoproduction is applied to the investigation of contributions of vector meson photoproduction to the Gerasimov-Drell-Hearn (GDH) sum rule. We find that the sum rule converges at a few GeVs. Contributions to the proton channel is found to be small while to the neutron is relatively large. The GDH sum rule [1] con...
متن کاملSpin Asymmetry and Gdh Sum Rule for Real and Virtual Photons for the Deuteron
An explicit evaluation of the spin asymmetry of the deuteron and the associated GDH sum rule is presented which includes disintegration, single and double pion and eta production. For the GDH integral a large cancellation is found between the disintegration channel and the meson production channels. Furthermore, first results for the contribution of the disintegration channel to the generalized...
متن کاملPion Electroproduction on the Nucleon and the Generalized Gdh Sum Rule
Results of the recently developed unitary isobar model (MAID) are presented for the spin asymmetries, structure functions and relevant sum rules in the resonance region. The model describes the presently available data for single-pion photoand electroproduction in the resonance region below Wcm = 2 GeV very well. It is based on Born terms and resonance contributions, and the respective multipol...
متن کاملQCD radiative and power corrections and Generalized GDH Sum Rules
We extend the earlier suggested QCD-motivated model for the Q-dependence of the generalized Gerasimov-Drell-Hearn (GDH) sum rule which assumes the smooth dependence of the structure function gT , while the sharp dependence is due to the g2 contribution and is described by the elastic part of the BurkhardtCottingham sum rule. The model successfully predicts the low crossing point for the proton ...
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ژورنال
عنوان ژورنال: Nuclear Physics A
سال: 2005
ISSN: 0375-9474
DOI: 10.1016/j.nuclphysa.2005.03.080