Physic of the nucleon sea quark distributions
نویسندگان
چکیده
منابع مشابه
The Quark Spin Distributions of the Nucleon
The quark helicity measured in polarized deep inelastic scattering is different from the quark spin in the rest frame of the nucleon. We point out that the quark spin distributions ∆qRF (x) are connected with the quark helicity distributions ∆q(x) and the quark transversity distributions δq(x) by an approximate relation: ∆qRF (x) +∆q(x) = 2δq(x). This relation will be useful in order to measure...
متن کاملSea Quark Asymmetries in the Nucleon
A physical model for parton densities in hadrons, based on Gaussian momentum fluctuations of partons and hadronic baryon-meson fluctuations, is presented. The model has previously been shown to describe proton structure function data, and is now applied to sea quark asymmetries and shown to describe the ¯ d − ¯ u asymmetry of the proton. By considering fluctuations involving strange quarks, the...
متن کاملFlavor decomposition of the sea-quark helicity distributions in the nucleon from semiinclusive deep inelastic scattering.
Double-spin asymmetries of semiinclusive cross sections for the production of identified pions and kaons have been measured in deep inelastic scattering of polarized positrons on a polarized deuterium target. Five helicity distributions including those for three sea quark flavors were extracted from these data together with reanalyzed previous data for identified pions from a hydrogen target. T...
متن کاملA chiral theory of light-flavor sea-quark distributions in the nucleon
Theoretical predictions are given for the light-flavor sea-quark distributions including the strange quark ones on the basis of the flavor SU(3) version of the chiral quark soliton model. Careful account is taken here of the SU(3) symmetry breaking effects due to the mass difference between the strange and nonstrange quarks. This effective mass difference ∆ms between the strange and nonstrange ...
متن کاملThe Quark / Antiquark Asymmetry of the Nucleon Sea ∗
Although the distributions of sea quarks and antiquarks generated by leadingtwist QCD evolution through gluon splitting g → qq are necessarily CP symmetric, the distributions of nonvalence quarks and antiquarks which are intrinsic to the nucleon’s bound state wavefunction need not be identical. In this paper we investigate the sea quark/antiquark asymmetries in the nucleon wavefunction which ar...
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ژورنال
عنوان ژورنال: Progress in Particle and Nuclear Physics
سال: 2000
ISSN: 0146-6410
DOI: 10.1016/s0146-6410(00)90012-7