Parton distribution functions from nonlocal light-cone operators with definite twist
نویسندگان
چکیده
منابع مشابه
Construction of nonlocal light–cone operators with definite twist
With the growing precision of data for light– cone dominated hard scattering processes like DIS, DVCS and various (semi) exclusive processes a better perturbative understanding of QCD concerning higher twist contributions is required. Thereby the nonlocal light–cone expansion (LCE) is optimally adapted since the same nonlocal LC operator, and its anomalous dimension, are related to different ph...
متن کاملDecomposition of nonlocal light-cone operators into harmonic operators of definite twist
Bilocal light–ray operators which are Lorentz scalars, vectors or antisymmetric tensors, and which appear in various hard QCD scattering processes, are decomposed into operators of definite twist. These operators are harmonic tensor functions and their Taylor expansion consists of (traceless) local light–cone operators which span irreducible representations of the Lorentz group with definite sp...
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A group theoretical procedure, introduced earlier in [6], to decompose bilocal light–ray operators into (harmonic) operators of definite twist is applied to the case of arbitrary 2nd rank tensors. As a generic example the bilocal gluon operator is considered which gets contributions of twist–2 up to twist–6 from four different symmetry classes characterized by corresponding Young tableaux; also...
متن کاملTwist decomposition of nonlocal light-ray operators and harmonic tensor functions
Light–cone(LC) dominated hard scattering processes, like deep inelastic scattering and deeply virtual Compton scattering, and various hadronic wave functions, e.g., vector meson amplitudes, appearing in (semi) exclusive processes are most effectively described by the help of the nonlocal light–cone expansion [1].Thereby, the same nonlocal LC–operator, and its anomalous dimension, is related to ...
متن کاملGeneralized Parton Distributions in Terms of Light-cone Wave Functions
The light-cone expansion is constructed by quantizing QCD at fixed lightcone time τ = t + z and forming the invariant light-cone Hamiltonian: H LC = P +P− − P 2 ⊥ where P± = P 0 ± P . The proton state, for example, satisfies: H LC |ψp〉 = M p |ψp〉. The expansion of the proton eigensolution |ψp〉 on the color-singlet B = 1, Q = 1 eigenstates {|n〉} of the free Hamiltonian H LC (g = 0) gives the lig...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2001
ISSN: 0556-2821,1089-4918
DOI: 10.1103/physrevd.63.094003