Models for the Polarized Parton Distributions of the Nucleon

Abstract

Polarized deep inelastic scattering (DIS) data are analyzed in leading and next-to-leading order of QCD within the common `standard' scenario of polarized parton distributions with a flavor-symmetric light sea (antiquark) distribution $\delta \bar{q}$, and a completely SU(3)${}_f$ broken `valence' scenario with totally flavor-asymmetric light sea densities $(\delta \bar{u}\ne \delta \bar{d}\ne \delta \bar{s})$. The latter flavor-broken light sea distributions are modelled with the help of a Pauli-blocking ansatz at the low radiative/dynamical input scales of ${\mu }_{\mathrm{LO}(\mathrm{NLO})}^2=0.26$ (0.40) GeV${}^2$ which complies with predictions of the chiral quark-soliton model and expectations based on the statistical parton model as well as with the corresponding, well established, flavor-broken unpolarized sea ($\bar{d}>\bar{u}$). Present semi-inclusive DIS data cannot yet uniquely discriminate between those two flavor-symmetric and flavor-broken polarized light sea scenarios.

39 pages, LaTeX

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• A QCD analysis of HERA and fixed target structure function data
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Cited by in corpus (278)

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• Determination of Polarized PDFs from a QCD Analysis of Inclusive and Semi-inclusive Deep Inelastic Scattering Data
• The Spin Structure of the Proton
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• Spin Structure of the Nucleon - Status and Recent Results
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• QCD Analysis of Polarized Deep Inelastic Scattering Data
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• Quark-Hadron Duality in Electron Scattering
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• Study of the Fundamental Structure of Matter with an Electron-Ion Collider
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• The Spin Structure of the Nucleon
• Single Transverse Spin Asymmetry for Large-p_T Pion Production in Semi-Inclusive Deep Inelastic Scattering
• Single-Inclusive Jet Production in Polarized pp Collisions at O(alpha_s^3)
• Inclusive cross section and double helicity asymmetry for pi^0 production in p+p collisions at sqrt(s) = 62.4 GeV
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• Azimuthal spin asymmetries in light-cone constituent quark models
• The gluon spin contribution to the proton spin from the double helicity asymmetry in inclusive pi^0 production in polarized p+p collisions at sqrt(s)=200 GeV
• Determination of gluon polarization from deep inelastic scattering and collider data
• Collins functions for pions from SIDIS and new e+e- data: a first glance at their transverse momentum dependence
• Impact of CLAS and COMPASS data on Polarized Parton Densities and Higher Twist
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• Transversity quark distributions in a covariant quark-diquark model
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• Pretzelosity distribution function h_1T^perp and the single spin asymmetry A_UT^sin(3phi-phi_S)
• Determination of polarized parton distribution functions with recent data on polarization asymmetries
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• Leading-Order Determination of the Gluon Polarization from high-$p_T$ Hadron Electroproduction
• Next-to-leading order QCD corrections to one hadron-production in polarized pp collisions at RHIC
• Flavor Structure of the Nucleon Sea
• Leading and higher twists in the proton polarized structure function at large Bjorken x
• Double Helicity Asymmetry in Inclusive Mid-Rapidity neutral pion Production for Polarized p+p Collisions at sqrt(s)=200 GeV
• Semi-Inclusive Deep Inelastic Scattering in Wandzura-Wilczek-type approximation
• Cross section and double helicity asymmetry for eta mesons and their comparison to neutral pion production in p+p collisions at sqrt(s)=200 GeV
• Effect of Orbital Angular Momentum on Valence-Quark Helicity Distributions
• A next-to-leading order QCD analysis of deeply virtual Compton scattering amplitudes
• Predictions for double spin asymmetry A_{LT} in Semi Inclusive DIS
• Light-flavor sea-quark distributions in the nucleon in the SU(3) chiral quark soliton model (I) -- phenomenological predictions --
• On the role of Collins effect in the single spin asymmetry A_N in p(transv. polarized) p --> h X processes
• Are there approximate relations among transverse momentum dependent distribution functions?
• Octet and Decuplet Baryon Magnetic Moments in the Chiral Quark Model
• Threshold Resummation for W-Boson Production at RHIC
• Complete analysis of spin structure function g1 of He-3
• Azimuthal asymmetries for hadron distributions inside a jet in hadronic collisions
• Exclusive photoproduction of a $\gamma \rho$ pair with a large invariant mass
• The Polarized and Unpolarized Photon Content of the Nucleon
• Drell-Yan processes, transversity and light-cone wavefunctions
• Transverse momentum dependence of the quark helicity distributions and the Cahn effect in double-spin asymmetry $A_{LL}$ in Semi Inclusive DIS
• Longitudinal double-spin asymmetry and cross section for inclusive neutral pion production at midrapidity in polarized proton collisions at sqrt(s) = 200 GeV
• Gluonic Pole Cross Sections and Single Spin Asymmetries in Hadron-Hadron Scattering
• The Sivers single-spin asymmetry in photon-jet production
• The Polarized Three-Loop Anomalous Dimensions from On-Shell Massive Operator Matrix Elements
• Generalized form factors, generalized parton distributions and the spin contents of the nucleon
• Exploring the structure of the proton through polarization observables in l p \to jet X
• Helicity Parton Distributions from Spin Asymmetries in W-Boson Production at RHIC
• Quark-Hadron Duality in Spin Structure Functions g1p and g1d
• Neutral pion cross section and spin asymmetries at intermediate pseudorapidity in polarized proton collisions at sqrt{s} = 200 GeV
• Photoproduction of a pi rhoT pair with a large invariant mass and transversity generalized parton distribution
• Next-to-next-to-leading order QCD analysis of spin-dependent parton distribution functions and their uncertainties: Jacobi polynomials approach
• Weighted azimuthal asymmetries in a diquark spectator model
• Measurement of Inclusive Spin Structure Functions of the Deuteron
• Transverse target spin asymmetry in inclusive DIS with two-photon exchange
• Quasi-parton distribution functions: a study in the diquark spectator model
• Resummation for Polarized Semi-Inclusive Deep-Inelastic Scattering at Small Transverse Momentum
• Single-spin asymmetries with weak bosons at RHIC
• A next-to-leading order analysis of deeply virtual Compton scattering
• Neutron single spin asymmetries from semi-inclusive deep inelastic scattering off transversely polarized ${}^3$He
• Nucleon spin structure functions at NNLO in the presence of target mass corrections and higher twist effects
• The Jacobi Polynomials QCD analysis for the polarized structure function
• Exploring twist-2 GPDs through quasi-distributions in a diquark spectator model
• Probing axial quark generalized parton distributions through exclusive photoproduction of a $\gamma {\pi }^{\pm }$ pair with a large invariant mass
• Transverse Momentum Dependent Parton Distribution/Fragmentation Functions at an Electron-Ion Collider
• Polarized Deeply Inelastic Scattering (DIS) Structure Functions for Nucleons and Nuclei
• Event Structure and Double Helicity Asymmetry in Jet Production from Polarized p+p Collisions at sqrt(s) = 200 GeV
• Dilepton production near partonic threshold in transversely polarized proton-antiproton collisions
• Nucleon parton distributions in a light-front quark model
• Charmonium production in polarized high-energy collisions
• On the Role of Higher Twist in Polarized Deep Inelastic Scattering
• Next-to-Leading Order QCD Corrections to the Polarized Hadroproduction of Heavy Flavors
• Polarized light-antiquark distributions in a meson-cloud model
• Gluon distributions in the proton in a light-front spectator model
• Non-Diagonal and Mixed Squark Production at Hadron Colliders
• Improved Measurement of Double Helicity Asymmetry in Inclusive Midrapidity pi^0 Production for Polarized p+p Collisions at sqrt(s)=200 GeV
• Slepton production in polarized hadron collisions
• QCD analysis of polarized DIS and the SIDIS asymmetry world data and light sea-quark decomposition
• QCD Spin Physics: Partonic Spin Structure of the Nucleon
• On the importance of Lorentz structure in the parton model: target mass corrections, transverse momentum dependence, positivity bounds
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• Longitudinally Polarized Photoproduction of Inclusive Hadrons at Fixed-Target Experiments
• Direct extraction of transversity and its accompanying T-odd distribution from the unpolarized and single-polarized Drell-Yan processes
• Spin-dependent twist-4 matrix elements from the instanton vacuum: Flavor-singlet and nonsinglet
• Longitudinal-transverse double-spin asymmetries in single-inclusive leptoproduction of hadrons
• NNLO corrections to massive lepton-pair production in longitudinally polarized proton-proton collisions
• Phenomenological analysis of the nucleon spin contents and their scale dependence
• Structure of the nucleon at leading and subleading twist in the covariant parton model
• Next-to-leading order evolution of generalized parton distributions for HERA and HERMES
• Quark-Hadron Duality in Neutron (3He) Spin Structure
• Target mass corrections for spin-dependent structure functions in collinear factorization
• The Role of Nucleon Strangeness in Supernova Explosions
• Accessing Transversity in Double-Spin Asymmetries at the BNL-RHIC
• Quark Distributions of Octet Baryons from SU(3) Symmetry
• Next-to-Leading order approximation of polarized valon and parton distributions
• Gluon distributions and their applications to Ioffe-time distributions
• Statistical approach for unpolarized fragmentation functions for the octet baryons
• Hyperon polarization in semi-inclusive deeply inelastic lepton-nucleon scattering at high energy
• A detailed QCD analysis of twist-3 effects in DVCS observables
• Anti-Lambda polarization in high energy pp collisions with polarized beam
• Longitudinally Polarized Photoproduction of Inclusive Hadrons Beyond the Leading Order
• Universal Higher Order QED Corrections to Polarized Lepton Scattering
• Comparative study of nuclear effects in polarized electron scattering from 3He
• Accessing chiral-even quark generalised parton distributions in the exclusive photoproduction of a $\gamma {\pi }^{\pm }$ pair with large invariant mass in both fixed-target and collider experiments
• Drell-Yan double-spin asymmetry A_{LT} in polarized p\bar{p} collisions: Wandzura-Wilczek contribution
• Hadron plus photon production in polarized hadronic collisions at next-to-leading order accuracy
• Neutron spin structure with polarized deuterons and spectator proton tagging at EIC
• Higher twist analysis of the proton g_1 structure function
• Cross section and longitudinal single-spin asymmetry $A_L$ for forward $W^{\pm }\to {\mu }^{\pm }\nu$ production in polarized $p$$+$$p$ collisions at $\sqrt{s}=510$ GeV
• Transverse single-spin asymmetries of pion production in semi-inclusive DIS at subleading twist
• Medium modifications of the bound nucleon GPDs and incoherent DVCS on nuclear targets
• Single-Inclusive Hadron Production in Polarized pp Scattering at Next-to-Leading Logarithmic Accuracy
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• Direct Solution of Renormalization Group Equations of QCD in $x-$space: NLO Implementations at Leading Twist
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• Nonperturbative contribution to the strange-antistrange asymmetry of the nucleon sea
• The full set of Polarized Deep Inelastic Scattering Structure Functions at NNLO accuracy
• Next-to-leading order QCD corrections to A_TT for prompt photon production
• Several Topics on Transverse Momentum-Dependent Fragmentation Functions
• Twist-2 Heavy Flavor Contributions to the Structure Function $g_2(x,Q^2)$
• IR-Improved DGLAP Theory
• NLO differential distributions of massive lepton-pair production in longitudinally polarized proton-proton collisions
• Flavor Structure of the Nucleon Sea
• Target mass corrections and higher twist effects in polarized deep-inelastic scattering
• Polarized parton distributions from NLO QCD analysis of world DIS and SIDIS data
• Moments of the neutron $g_2$ structure function at intermediate $Q^2$
• Longitudinal polarization of hyperon and anti-hyperon in semi-inclusive deep-inelastic scattering
• Global analysis of polarized DIS & SIDIS data with improved small-$x$ helicity evolution
• Role of Positivity Constraints in Determining Polarized Parton Densities
• Some Remarks on Methods of QCD Analysis of Polarized DIS Data
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• Double Spin Asymmetries for Large-$p_T$ Hadron Production in Semi-Inclusive DIS
• Gaugino-pair production in polarized and unpolarized hadron collisions
• Polarized Gluon Distribution Delta g(x) in the Proton
• Collins and Sivers effects in p(transv. polarized) p --> jet pion X: Universality and process dependence
• Double Transverse-Spin Asymmetries in Drell-Yan Processes with Antiprotons
• Parton distributions from the lattice
• Anti-Hyperon polarization in high energy pp collisions with polarized beams
• Polarized gluon distribution in the proton from holographic light-front QCD
• NLO QCD method of the polarized SIDIS data analysis
• Next-to-leading order QCD corrections to single-inclusive hadron production in transversely polarized p-p and pbar-p collisions
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• Exploring the polarization of gluons in the nucleon
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• A new approach to calculate the gluon polarization
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• Impact of recent COMPASS data on polarized parton distributions and structure functions
• Single-spin asymmetries in electroproduction of pions on the longitudinally polarized nucleon targets
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• Heavy quarks in deeply virtual Compton scattering
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• Soft gluon corrections to double transverse-spin asymmetries for small-$Q_T$ dilepton production at RHIC and J-PARC
• Single Target-Spin Asymmetry in Semi-Inclusive Deep Inelastic Scattering on Transversely Polarized Nucleon Target
• Spin transfer and polarization of antihyperons in lepton induced reactions
• Resonant contributions to polarized proton structure functions
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• Double transverse spin asymmetry in the $p^{\uparrow }{\bar{p}}^{\uparrow }$ Drell-Yan process from Sivers functions
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• Parity-violating asymmetry of $W$ bosons produced in $p$-$p$ collisions
• Spin constraints on Regge predictions and perturbative evolution in high energy collisions
• An approach to NLO QCD analysis of the semi-inclusive DIS data with modified Jacobi polynomial expansion method
• Measurements of Delta G/G
• Final state interactions and the extraction of neutron single spin asymmetries from SIDIS by a transversely polarized ${}^3$He target
• Weak effects in proton beam asymmetries at polarised RHIC and beyond
• Next-to-Leading Order QCD Corrections to Heavy Quark Correlations in Longitudinally Polarized Hadron-Hadron Collisions
• Predicting the $\sin {\varphi }_S$ Transverse Single-spin Asymmetry of Pion Production at an Electron Ion Collider
• Longitudinally Polarized Photoproduction of Heavy Flavors at Next-to-Leading Order of QCD
• Structure Functions of Unstable Lithium Isotopes
• Magnetic moments of octet baryons and sea antiquark polarizations
• General positivity bounds for spin observables in particle inclusive production
• Non-Singlet spin structure function in the valon model and low x scaling behavior of $g_1^{NS}$ and $g_1^p$
• Lepton Helicity Distributions in Polarized Drell-Yan Process
• Double-spin asymmetries for small-Q_T Drell-Yan pair production in transversely polarized p\bar{p} collisions
• Higher Order Heavy Quark Corrections to Deep-Inelastic Scattering
• Extraction of characteristic constants in QCD with perturbative and nonperturbative methods
• The spin dependent structure functions of the nucleon
• On the extraction of the valence transversity distributions from SIDIS data
• Medium modifications of the bound nucleon GPDs and the quark contribution to the spin sum rule
• Recent data analysis to revisit the spin structure function of nucleon in Laplace space
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• Integral equation for spin dependent unintegrated parton distributions incorporating double ln^2(1/x) effects at low x
• Next-to-leading order QCD corrections to spin-dependent hadron-pair photoproduction
• Kinked tracks from ${\Sigma }^{+}$ baryons as a probe of light quark polarizations
• A polarized version of the CCFM equation for gluons
• An analysis of polarized parton distribution functions with nonlinear QCD evolution equations
• Effect of polarized gluon distribution on spin asymmetries for neutral and charged pion production
• Hadron-Pair Photoproduction in Longitudinally Polarized Lepton-Nucleon Collisions
• Polarization phenomena in open charm photoproduction processes
• Double-spin asymmetry $A_{LT}^{\cos {\varphi }_S}$ in semi-inclusive DIS at CLAS12 and EIC within the collinear framework
• Comparison of the fits to data on polarised structure functions and spin asymmetries
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• Accessing the Longitudinally Polarized Photon Content of the Proton
• On the beam spin asymmetries of electroproduction of charged hadrons off the nucleon targets
• Towards an understanding of nucleon spin structure: from hard to soft scales
• A Method of Experimentally Probing Transeverse Momentum Dependent Distributions
• Small-x behavior of non-singlet spin structure function and Bjorken sum rule with pQCD correction up to NNLO and Higher twist correction
• Polarized Gluon Distribution Function from ${\eta }^{\prime }$ Production
• Effect of symmetry breaking of polarized light sea quarks on the nucleon and nuclear structure functions, and sum rules
• Probing Gluons at the Spin Physics Detector
• Isovector helicity quark quasi-distributions inside a large Nc nucleon
• Spin physics with STAR
• Measurement of the Transverse Single-Spin Asymmetry for Mid-rapidity Production of Neutral Pions in Polarized p+p Collisions at 200 GeV Center-of-Mass Energy
• What the lattice can tell us about nucleon structure
• A sign change of the moment at $n=0$ of the polarized structure function $g_1^p$
• Extraction of Polarized Gluon Distributions from Large-pt Light Hadron Pair Production
• The longitudinal polarization of hyperons in the forward region in polarized $pp$ collisions
• Direct Estimate of the Gluon Polarization in the Nucleon
• The Kinetic Interpretation of the DGLAP Equation, its Kramers-Moyal Expansion and Positivity of Helicity Distributions
• Summary of Working Group 3 of the Neutrino Factory '02 Workshop
• NNLO Corrections to the Polarized Drell-Yan Coefficient Function
• Recent results of high-energy spin phenomena of gluons and sea-quarks in polarized proton-proton collisions at RHIC at BNL
• Parton distributions and $\cos 2{\varphi }_h$ asymmetry induced by anomalous photon-quark coupling
• Toward Precision Helicity PDFs from Global DIS and SIDIS Fits with Projected EIC Measurements
• Recent STAR results in high-energy polarized proton-proton collisions at RHIC
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• Intrinsic parton motion soft mechanisms and the longitudinal spin asymmetry A_LL in high energy pp -> pi X
• ${\chi }_{cJ}$ Polarization in Polarized Proton-Proton Collisions at RHIC
• Double logarithms, $l{n}^2(1/x)$, and the NLO DGLAP evolution for the non-singlet component of the nucleon spin structure function, $g_1$
• The sum rules for the spin dependent structure functions $g_1$ in the isovector reaction
• Probing Polarized Gluon Distributions through Charmed Hadron Production in Polarized pp Collisions at BNL--RHIC Energy
• PHENIX Spin Program, Recent Results
• Recent Longitudinal Spin Asymmetry Measurements for Inclusive Jet Production at STAR
• Spin Alignment of Vector Meson in High Energy Reactions
• QCD Corrections to Dilepton Production near Partonic Threshold in proton-antiproton Scattering
• The meson polarized distribution function and mass dependence of the nucleon parton densities
• Charmed Hadron Production at RHIC
• Polarized s-quark Distribution in Charmed Hadron Leptoproduction
• Single Diffractive Lambda_c^+ Production in Polarized pp Scattering with Polarized Gluon Distribution in the Proton
• Charmed Hadron Production in Polarized pp Reactions as a Probe of Polarized Gluons in the Proton
• Charmed Hadron Production in Neutrino Reactions and Polarized s-quark Distribution
• Recent developments in nucleon spin structure with focus on h_{1L}^{\perp} and pretzelosity h_{1T}^\perp
• Flavor asymmetry of the polarized nucleon sea
• Recent results of gluon and sea quark polarization measurements in polarized proton-proton collisions at STAR