Off-forward gluonometry
نویسندگان
چکیده
منابع مشابه
Off-Forward Parton Distributions
Recently, there have been some interesting developments involving offforward parton distributions of the nucleon, deeply virtual Compton scattering, and hard diffractive vector-meson production. These developments are triggered by the realization that the off-forward distributions contain information about the internal spin structure of the nucleon and that diffractive electroproduction of vect...
متن کاملar X iv : h ep - p h / 00 05 02 8 v 1 3 M ay 2 00 0 Off - forward gluonometry .
We explore the deeply virtual Compton scattering process at NLO with the emphasis on the measurement of the tensor gluon skewed distributions. We recalculate the one-loop coefficient function and give two-loop results for anomalous dimensions and exclusive evolution kernels required for studying the logarithmic scaling violation. We evaluate weighted cross sections which give direct access to t...
متن کاملA Study of Off-forward Parton Distributions
An extensive theoretical analysis of off-forward parton distributions (OFPDs) is presented. The OFPDs and the form factors of the quark energy-momentum tensor are estimated at a low-energy scale using a bag model. Relations among the second moments of OFPDs, the form factors, and the fraction of the nucleon spin carried by quarks are discussed. PACS numbers: 12.38.Aw, 12.39.Ba, 13.40.Gp, 13.60....
متن کاملPositivity constraints for Off-Forward Parton Distributions
Off-Forward Parton Distributions (OFPD’s) are new hadronic objects which may be measured in various exclusive reactions. We derive non-trivial positivity constraints for them that should allow to get extra restrictions for model inputs. PACS numbers:12.38.Bx, 13.88.+e Unité Propre de Recherche 7061 CPT-98/P.3633 Web address: www.cpt.univ-mrs.fr Unité Mixte de Recherche C7644 du Centre National ...
متن کاملOff-forward Matrix Elements in Light-Front Hamiltonian QCD
We investigate the off-forward matrix element of the light cone vector operator for a dressed quark state in light-front Hamiltonian perturbation theory. We obtain the corresponding splitting functions in a straightforward way. We show that the end point singularity is canceled by the contribution from the normalization of state. Considering mixing with the gluon operator, we verify the helicit...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 2000
ISSN: 0370-2693
DOI: 10.1016/s0370-2693(00)00773-5