Polarized parton densities in the nucleon

Leader, Elliot; Сидоров, А. В.; Stamenov, Dimiter B.

doi:10.1103/physrevd.58.114028

Cited by 193 publications

(352 citation statements)

References 52 publications

(48 reference statements)

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“…(48) are used to express these in terms of the spin-dependent PDFs in the nucleon, and in practice we take the fit from Ref. [73] for both the polarized PDFs and the D and F values. The results using other parametrizations for the spin-averaged [69,70,74] or spin-dependent [75,76] u and d distributions yields very similar results.…”

Section: Kr Distributions S (Kr)mentioning

confidence: 99%

Strange-quark asymmetry in the proton in chiral effective theory

Wang

Melnitchouk

et al. 2016

Phys. Rev. D

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We perform a comprehensive analysis of the strange-antistrange parton distribution function (PDF) asymmetry in the proton in the framework of chiral effective theory, including the full set of lowest order kaon loop diagrams with off-shell and contact interactions, in addition to the usual on-shell contributions previously discussed in the literature. We identify the presence of δ-function contributions to thes PDF at x = 0, with a corresponding valence-like component of the s-quark PDF at larger x, which allows greater flexibility for the shape of s −s. Expanding the moments of the PDFs in terms of the pseudoscalar kaon mass, we compute the leading nonanalytic behavior of the number and momentum integrals of the s ands distributions, consistent with the chiral symmetry of QCD. We discuss the implications of our results for the understanding of the NuTeV anomaly and for the phenomenology of strange quark PDFs in global QCD analysis.

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Section: Kr Distributions S (Kr)mentioning

confidence: 99%

Strange-quark asymmetry in the proton in chiral effective theory

Wang

Melnitchouk

et al. 2016

Phys. Rev. D

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“…Assuming SU(3) f flavour symmetry, global fits [11,12] on inclusive DIS data favour a large and negative first moment for the strange contribution, ∆s + ∆s ≈ −0.10. Combined analysis of parity violating ep asymmetries and ν p elastic data, used for the extraction of the strange axial form factor, also suggests a negative strange quark contribution [13].…”

Section: Introductionmentioning

confidence: 99%

Quark helicity distributions from longitudinal spin asymmetries in muon–proton and muon–deuteron scattering

Windmolders

2010

Physics Letters B

135

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Double-spin asymmetries for production of charged pions and kaons in semi-inclusive deep-inelastic muon scattering have been measured by the COMPASS experiment at CERN. The data, obtained by scattering a 160 GeV muon beam off a longitudinally polarised NH 3 target, cover a range of the Bjorken variable x between 0.004 and 0.7. A leading order evaluation of the helicity distributions for the three lightest quarks and antiquark flavours derived from these asymmetries and from our previous deuteron data is presented. The resulting values of the sea quark distributions are small and do not show any sizable dependence on x in the range of the measurements. No significant difference is observed between the strange and antistrange helicity distributions, both compatible with zero. The integrated value of the flavour asymmetry of the helicity distribution of the light-quark sea, ∆u − ∆d, is found to be slightly positive, about 1.5 standard deviations away from zero.

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“…Probably, the most ambitious analyses free from these ad hoc assumptions on the sea-quark distributions are those of Leader, Sidorov and Stamenov (LSS) [52]. (See also Ref.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

Light-flavor sea-quark distributions in the nucleon in the SU(3) chiral quark soliton model. I. Phenomenological predictions

Wakamatsu

2003

Phys. Rev. D

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Theoretical predictions are given for the light-flavor sea-quark distributions in the nucleon including the strange quark ones on the basis of the flavor SU(3) version of the chiral quark soliton model. Careful account is taken of the SU(3) symmetry breaking effects due to the mass difference ∆m s between the strange and nonstrange quarks, which is the only one parameter necessary for the flavor SU(3) generalization of the model. A particular emphasis of study is put on the light-flavor

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Polarized parton densities in the nucleon

Cited by 193 publications

References 52 publications

Strange-quark asymmetry in the proton in chiral effective theory

Strange-quark asymmetry in the proton in chiral effective theory

Quark helicity distributions from longitudinal spin asymmetries in muon–proton and muon–deuteron scattering

Light-flavor sea-quark distributions in the nucleon in the SU(3) chiral quark soliton model. I. Phenomenological predictions

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