New analysis concerning the strange quark polarization puzzle

Abstract

The fact that analyses of semi-inclusive deep inelastic scattering suggest that the polarized strange quark density $\Delta s(x)+\Delta \bar{s}(x)$ is positive in the measured region of Bjorken x, whereas all analyses of inclusive deep inelastic scattering yield significantly negative values of this quantity, is known as the "strange quark polarization puzzle". We have analyzed the world data on inclusive deep inelastic scattering, including the COMPASS 2010 proton data on the spin asymmetries, and for the first time, the new extremely precise JLab CLAS data on the proton and deuteron spin structure functions. Despite allowing in our parametrization, for a possible sign change, our results confirm that the inclusive data yield significantly negative values for the polarized strange quark density.

arXiv comment8 pages, 3 figures, 3 tables; misprints for the values of ${\chi }^2/DOF$ in page 5 corrected

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• Parton distributions and lattice QCD calculations: toward 3D structure
• Iterative Monte Carlo analysis of spin-dependent parton distributions
• Parton Distributions in Nucleons and Nuclei
• Parton-to-Kaon Fragmentation Revisited
• The Spin Structure of the Nucleon
• Small-$x$ asymptotics of the quark helicity distribution
• First Monte Carlo analysis of fragmentation functions from single-inclusive $e^{+}{e}^{-}$ annihilation
• Next-to-next-to-leading order QCD analysis of spin-dependent parton distribution functions and their uncertainties: Jacobi polynomials approach
• Precise Determination of the Deuteron Spin Structure at Low to Moderate $Q^2$ with CLAS and Extraction of the Neutron Contribution
• Conceptual design of the Spin Physics Detector
• Flavor decomposition of the nucleon unpolarized, helicity and transversity parton distribution functions from lattice QCD simulations
• Structure of the nucleon at leading and subleading twist in the covariant parton model
• Strange and Charm Quark Spins from Anomalous Ward Identity
• Longitudinal double-spin asymmetry for inclusive jet and dijet production in polarized proton collisions at $\sqrt{s}=200$ GeV
• The Role of Nucleon Strangeness in Supernova Explosions
• Study of spin-dependent structure functions of ${}^3\mathrm{He}$ and ${}^3\mathrm{H}$ at NNLO approximation and corresponding nuclear corrections
• Spin Physics at J-PARC
• Global analysis of polarized DIS & SIDIS data with improved small-$x$ helicity evolution
• Gluon PDF from Quark dressing in the Nucleon and Pion
• Weak Neutral Current Axial Form Factor Using $(\bar{\nu })\nu$-Nucleon Scattering and Lattice QCD Inputs
• Determination of neutron fracture functions from a global QCD analysis of leading neutron production at HERA
• Phenomenology of leading nucleon production in $ep$ collisions at HERA in the framework of fracture functions
• Measurements of Differential Cross Sections of Inclusive ${\pi }^0$ and $K_S^0$ Production in $e^{+}{e}^{-}$ Annihilation at Energies from 2.2324 to 3.6710 GeV
• Impact of recent COMPASS data on polarized parton distributions and structure functions
• Nucleon form factors and parton distributions in nonlocal chiral effective theory
• Strange quark helicity in the proton from chiral effective theory
• Sensitivity of strange quark polarization to flavor SU(3) symmetry breaking
• Quark and Glue Components of the Proton Spin from Lattice Calculation
• Parton distribution functions with QED corrections in the valon model
• Effect of symmetry breaking of polarized light sea quarks on the nucleon and nuclear structure functions, and sum rules
• Helicity-dependent distribution of strange quarks in the proton from nonlocal chiral effective theory
• AAK24: Global QCD analysis on polarized parton distribution in the presence of $A_2$ asymmetry measurements