Off-forward parton distributions and impact parameter dependence of parton structure
نویسندگان
چکیده
منابع مشابه
Off-forward Parton Distributions and Impact Parameter Dependent Parton Structure
where x = x±x and p = p+p refer to the usual light-cone components, p̄ = 1 2 (p+ p), ∆ = p− p, and t ≡ ∆. The “off-forwardness” (or skewedness) in Eqs. (1,2) is defined as ξ ≡ ∆ + p+ . From the point of view of parton physics in the infinite momentum frame, these OFPDs have the physical meaning of the amplitude for the process that a quark is taken out of the nucleon with longitudinal momentum f...
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The connection between parton distributions as a function of the impact parameter and off-forward parton distributions is discussed in the limit of vanishing skewedness parameter ζ, i.e. when the off-forwardness is purely transverse. For the 2nd moment it is also illustrated how to relate ζ 6= 0 data to ζ = 0 data, which is important for experimental measurements of these observables.
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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...
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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....
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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 ...
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ژورنال
عنوان ژورنال: Nuclear Physics B - Proceedings Supplements
سال: 2000
ISSN: 0920-5632
DOI: 10.1016/s0920-5632(00)00880-x