First Extraction of Transverse Momentum Dependent Helicity Distributions

Abstract

We report on the first global analysis of transverse momentum dependent helicity distributions of the proton. The analysis is performed at next-to-leading order with the evolution factor at next-to-next-to-leading-logarithmic accuracy. Nonzero signals are determined for up and down quarks and their $k_T$-integrated polarization are consistent with analyses in collinear factorization, while the distributions of other flavors are loosely constrained by existing data. With increasing transverse momentum, quarks at large $x$ become less polarized while those at small $x$ become more polarized.

8 pages, 3 figures; match the published version in Physical Review Letters, and include the Supplemental Material

References in corpus (79)

• Parton distributions from high-precision collider data
• QCD Factorization for Semi-Inclusive Deep-Inelastic Scattering at Low Transverse Momentum
• The Spin Structure of the Nucleon
• Electron-Ion Collider in China
• Extraction of Spin-Dependent Parton Densities and Their Uncertainties
• Single-spin asymmetries: the Trento conventions
• A first unbiased global determination of polarized PDFs and their uncertainties
• TMD Parton Distribution and Fragmentation Functions with QCD Evolution
• QCD Factorization for Spin-Dependent Cross Sections in DIS and Drell-Yan Processes at Low Transverse Momentum
• Physics Opportunities with the 12 GeV Upgrade at Jefferson Lab
• Evidence for polarization of gluons in the proton
• QCD Constrains on the Shape of Polarized Quark and Gluon Distributions
• Factorization Theorem For Drell-Yan At Low q_T And Transverse-Momentum Distributions On-The-Light-Cone
• Transverse-momentum distributions in a diquark spectator model
• Global Analysis of Helicity Parton Densities and Their Uncertainties
• Quark helicity distributions in the nucleon for up, down, and strange quarks from semi--inclusive deep--inelastic scattering
• Global Analysis of Fragmentation Functions for Protons and Charged Hadrons
• Parton-to-Pion Fragmentation Reloaded
• Transverse momentum dependent (TMD) parton distribution functions: status and prospects
• QCD Analysis of Polarized Deep Inelastic Data and Parton Distributions
• Extraction of partonic transverse momentum distributions from semi-inclusive deep-inelastic scattering, Drell-Yan and Z-boson production
• Extraction of Quark Transversity Distribution and Collins Fragmentation Functions with QCD Evolution
• First simultaneous extraction of spin-dependent parton distributions and fragmentation functions from a global QCD analysis
• Inclusive cross section and double helicity asymmetry for π^0 production in p+p collisions at sqrt(s)=200 GeV: Implications for the polarized gluon distribution in the proton
• Determination of Polarized PDFs from a QCD Analysis of Inclusive and Semi-inclusive Deep Inelastic Scattering Data
• Polarised Quark Distributions in the Nucleon from Semi-Inclusive Spin Asymmetries
• Transverse momentum dependent parton distributions in a light-cone quark model
• Flavor Decomposition of the Polarized Quark Distributions in the Nucleon from Inclusive and Semi-inclusive Deep-inelastic Scattering
• Non-perturbative structure of semi-inclusive deep-inelastic and Drell-Yan scattering at small transverse momentum
• QCD Analysis of the Polarized World Data
• QCD Analysis of Polarized Deep Inelastic Scattering Data
• Iterative Monte Carlo analysis of spin-dependent parton distributions
• Measurement of the Spin Asymmetry in the Photoproduction of Pairs of High-pT Hadrons at HERMES
• A statistical approach for polarized parton distributions
• Precision Measurement of the Longitudinal Double-spin Asymmetry for Inclusive Jet Production in Polarized Proton Collisions at $\sqrt{s}=200$ GeV
• Parton-to-Kaon Fragmentation Revisited
• The Spin Structure of the Nucleon
• Inclusive cross section and double helicity asymmetry for pi^0 production in p+p collisions at sqrt(s) = 62.4 GeV
• Melosh rotation: source of the proton's missing spin
• The Polarised Valence Quark Distribution from semi-inclusive DIS
• The Proton Spin and the Wigner Rotation
• 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
• The Quark Spin Distributions of the Nucleon
• Inclusive double-helicity asymmetries in neutral pion and eta meson production in $\vec{p}+\vec{p}$ collisions at $\sqrt{s}=200$ GeV
• A New Evaluation of Polarized Parton Densities in the Nucleon
• Nucleon spin structure at very high-x
• Leading and Next-to-Leading Order Gluon Polarisation in the Nucleon and Longitudinal Double Spin Asymmetries from Open Charm Muoproduction
• Systematic analysis of double-scale evolution
• Leading-Order Determination of the Gluon Polarization from high-$p_T$ Hadron Electroproduction
• Extraction of the Sivers function from SIDIS, Drell-Yan, and $W^{\pm }/Z$ boson production data with TMD evolution
• Double Helicity Asymmetry in Inclusive Mid-Rapidity neutral pion Production for Polarized p+p Collisions at sqrt(s)=200 GeV
• Effect of Orbital Angular Momentum on Valence-Quark Helicity Distributions
• Global analysis of the Sivers functions at NLO+NNLL in QCD
• Leading order determination of the gluon polarisation from DIS events with high-p_T hadron pairs
• Twist-2 matching of transverse momentum dependent distributions
• Measurement of the Longitudinal Spin Transfer to Lambda and Anti-Lambda Hyperons in Polarised Muon DIS
• Neutral pion cross section and spin asymmetries at intermediate pseudorapidity in polarized proton collisions at sqrt{s} = 200 GeV
• Constraints on spin-dependent parton distributions at large x from global QCD analysis
• The three-dimensional distribution of quarks in momentum space
• Flavor decomposition of the nucleon unpolarized, helicity and transversity parton distribution functions from lattice QCD simulations
• Flavor decomposition for the proton helicity parton distribution functions
• Updated QCD global analysis of single transverse-spin asymmetries I: Extracting $\tilde{H}$, and the role of the Soffer bound and lattice QCD
• Unified Description of Polarized and Unpolarized Quark Distributions in the Proton
• Towards the determination of the gluon helicity distribution in the nucleon from lattice quantum chromodynamics
• Event Structure and Double Helicity Asymmetry in Jet Production from Polarized p+p Collisions at sqrt(s) = 200 GeV
• Improved Measurement of Double Helicity Asymmetry in Inclusive Midrapidity pi^0 Production for Polarized p+p Collisions at sqrt(s)=200 GeV
• Disentangling Long and Short Distances in Momentum-Space TMDs
• Azimuthal asymmetries of charged hadrons produced in high-energy muon scattering off longitudinally polarised deuterons
• Non-singlet quark helicity PDFs of the nucleon from pseudo-distributions
• First global QCD analysis of the TMD ${\mathbf{g}}_{1\mathbf{T}}$ from semi-inclusive DIS data
• Longitudinal double-spin asymmetries in semi-inclusive deep-inelastic scattering of electrons and positrons by protons and deuterons
• Parton Sum Rules and Improved Scaling Variable
• Nucleon Helicity Parton Distribution Function in the Continuum Limit with Self-Renormalization
• Semi-Inclusive ${\pi }_0$ target and beam-target asymmetries from 6 GeV electron scattering with CLAS
• Study of worm-gear-T function $g_{1T}$ with semi-inclusive DIS data
• Towards three-dimensional nucleon structures at the Electron-Ion Collider in China: A study of the Sivers function
• The x-Dependent Helicity Distributions for Valence Quarks in Nucleons
• New study of the Boer-Mulders function: Implications for the quark and hadron transverse momenta

Cited by in corpus (3)

• Semi-inclusive deep inelastic scattering off a tensor-polarized spin-1 target
• Deep Neural Network extraction of Unpolarized Transverse Momentum Distributions
• Lattice QCD Benchmark of Proton Helicity and Flavor-Dependent Unpolarized Transverse Momentum-Dependent Parton Distribution Functions at Physical Quark Masses