POLARIZED PARTON DISTRIBUTIONS AND THE POLARIZED GLUON ASYMMETRY
نویسندگان
چکیده
منابع مشابه
Polarized Parton Distributions and the Polarized Gluon Asymmetry
The flavor-dependent valence, sea quark and antiquark spin distributions can be determined separately from theoretical assumptions and experimental data. We have determined the valence distributions using the Bjorken sum rule and have extracted polarized sea distributions, assuming that the quarks and anti-quarks for each flavor are symmetric. Other experiments have been proposed which will all...
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In order to extract the behavior and magnitude of the spin–dependent gluon distribution, we propose a semi–inclusive Λ+c production using unpolarized lepton beams and polarized proton targets. The correlation between the target proton spin and the spin of Λ+c produced in the target fragmentation region might be very effective for testing various models of polarized gluons. E–mail kochelev@thsun...
متن کاملQ-Invariant Polarized Gluon Asymmetry
The absence of ”valence-gluon“ degrees of freedom combined with an examination of radiative QCD diagrams leads to an implication that the gluon spin asymmetry in a proton, defined as AG(x, Q ) = ∆G(x,Q ) G(x,Q) , should be approximately Q 2 invariant. The condition for scale invariance completely determines the x-dependence of this asymmetry, which satisfies constituent counting rules and repro...
متن کاملParametrization of polarized parton distributions
We report the polarized parton distributions proposed by the Asymmetry Analysis Collaboration (AAC). Using parametrized distributions at Q 2 =1 GeV 2 and measured A1 data, we determine optimum polarized distributions in the leading order (LO) and next-to-leading order (NLO). We find that the polarized antiquark distribution is not well determined particularly at small x. It could lead to a rath...
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: International Journal of Modern Physics A
سال: 2003
ISSN: 0217-751X,1793-656X
DOI: 10.1142/s0217751x03014538