Polarized parton distribution functions in the nucleon
نویسندگان
چکیده
منابع مشابه
Polarized Parton Distribution Functions in the Nucleon
Polarized parton distribution functions are determined by using world data from the longitudinally polarized deep inelastic scattering experiments. A new parametrization of the parton distribution functions is adopted by taking into account the positivity and the counting rule. From the fit to the asymmetry data A1, the polarized distribution functions of u and d valence quarks, sea quarks, and...
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The hard-gluonic contribution to the first moment of the polarized proton structure function g 1(x) is dependent of the factorization convention chosen in defining the quark spin density and the hard cross section for photon-gluon scattering. Two extremes of interest, namely gauge-invariant and chiral-invariant factorization schemes, are considered. We show that in order to satisfy the positivi...
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Polarized parton distribution functions are determined by using asymmetry A 1 data from longitudinally polarized deep inelastic scattering experiments. From our χ 2 analysis, polarized u-valence, d-valence, antiquark, and gluon distributions are obtained. We propose one set of leading-order distributions and two sets of next-to-leading-order ones as the longitudinally-polarized parton distribut...
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A new and simple statistical approach is performed to calculate the parton distribution functions (PDFs) of the nucleon in terms of light-front kinematic variables. We do not put in any extra arbitrary parameter or corrected term by hand, which guarantees the stringency of our approach. Analytic expressions of the x-dependent PDFs are obtained in the whole x region [0,1], and some features, esp...
متن کاملPolarized parton distributions in the nucleon.
The distribution of the spin of the nucleon among its constituents can be parametrized in the form of polarized parton distribution functions for quarks and gluons. Using all available data on the polarized structure function g1(x,Q 2), we determine these distributions both at leading and next–to–leading order in perturbation theory. We suggest three different, equally possible scenarios for th...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2000
ISSN: 0556-2821,1089-4918
DOI: 10.1103/physrevd.62.034017