Off-forward parton distributions and impact parameter dependence of parton structure
نویسنده
چکیده
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.
منابع مشابه
ar X iv : h ep - p h / 03 07 19 8 v 1 1 5 Ju l 2 00 3 Impact - parameter dependence of the generalized parton distribution of the pion in chiral quark models ⋆
We compute the off-forward diagonal (non-skewed) non-singlet generalized parton distribution of the pion in two distinct chiral quark models: the Nambu-Jona-Lasinio model with the Pauli-Villars regulator and the Spectral Quark Model. The analysis is carried out in the impact-parameter space. Leading-order perturbative QCD evolution is carried out via the inverse Mellin transform in the index sp...
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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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تاریخ انتشار 2000