منابع مشابه
Positivity 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 کاملPositivity constraints for spin-dependent Parton distributions.
We derive new positivity constraints on the spin-dependent structure functions of the nucleon. These model independent results reduce considerably their domain of allowed values, in particular for the chiral-odd parton distribution h1(x). PACS Numbers : 12.90+b, 12.40.Aa, 13.88+e Key-Words : Positivity, polarized quark distributions. Number of figures : 3 September 1994 CPT-94/P.3059 anonymous ...
متن کاملParton Distributions
I present an overview of some current topics in the measurement of Parton Distribution Functions.
متن کاملEvolution of Parton Distributions
I present a highly efficient method for evolving parton distributions in perturbative QCD. The method allows evolving the parton distribution functions according to any of the commonly-used truncations of the evolution equations (which differ in their treatment of higher-order terms). I also give formulæ for computing crossing functions within the method. Submitted to Nuclear Physics B Laborato...
متن کاملOn “dual” parametrizations of generalized parton distributions
We propose a parametrization for the generalized parton distributions (GPDs) which is based on representation of parton distributions as an infinite series of tchannel exchanges. The entire generalized parton distribution is given as an infinite sum over contributions of generalized light-cone distribution amplitudes in the tchannel. We also discuss the relations of the lowest Mellin moments of...
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ژورنال
عنوان ژورنال: Nuclear Physics B
سال: 1998
ISSN: 0550-3213
DOI: 10.1016/s0550-3213(98)00661-0