Can the polarization of the strange quarks in the proton be positive ?

Abstract

Recently, the HERMES Collaboration at DESY, using a leading order QCD analysis of their data on semi-inclusive deep inelastic production of charged hadrons, reported a marginally positive polarization for the strange quarks in the proton. We argue that a non-negative polarization is almost impossible.

arXiv comment6 pages, latex, minor changes in the discussion after Eq. (9)

References in corpus (13)

• Models for the Polarized Parton Distributions of the Nucleon
• Measurements of the Proton and Deuteron Spin Structure Functions g1 and g2
• Measurements of the $Q^2$-Dependence of the Proton and Neutron Spin Structure Functions g1p and g1n
• QCD Analysis of Polarized Deep Inelastic Data and Parton Distributions
• Polarized Parton Distribution Functions in the Nucleon
• SU(3) symmetry breaking in hyperon semileptonic decays
• A New Evaluation of Polarized Parton Densities in the Nucleon
• Fragmentation functions from semi-inclusive DIS pion production and implications for the polarized parton densities
• SU(3) Breaking Effects in Hyperon Semi-Leptonic Decays and the extraction of F and D
• Inclusive and Semi-Inclusive Polarized DIS Data Revisited
• SU(3) Breaking in Hyperon Beta Decays: a Prediction for Xi^0 -> Sigma^+ e nu-bar
• First Measurement of Form Factors of the Decay Xi0->Sigma+ e- anti-nu/e
• Hermes and the spin of the proton

Cited by in corpus (20)

• Extraction of Spin-Dependent Parton Densities and Their Uncertainties
• The Deuteron Spin-dependent Structure Function g1d and its First Moment
• The Spin Structure of the Proton
• Spin Structure of the Nucleon - Status and Recent Results
• The Polarised Valence Quark Distribution from semi-inclusive DIS
• Flavour Separation of Helicity Distributions from Deep Inelastic Muon-Deuteron Scattering
• The nucleon's octet axial-charge g_A^8 with chiral corrections
• A light front quark-diquark model for the nucleons
• Threshold Resummation for W-Boson Production at RHIC
• QCD analysis of polarized DIS and the SIDIS asymmetry world data and light sea-quark decomposition
• Anti-Lambda polarization in high energy pp collisions with polarized beam
• The proton spin puzzle: where are we today ?
• Several Topics on Transverse Momentum-Dependent Fragmentation Functions
• First measurement of the strange axial coupling constant using neutral-current quasielastic interactions of atmospheric neutrinos at KamLAND
• Polarized parton distributions from NLO QCD analysis of world DIS and SIDIS data
• Neutron knockout in neutral-current neutrino-oxygen interactions
• Comment on polarized quark distributions extracted from SIDIS experiments
• Axial Vector Current Matrix Elements and QCD Sum Rules
• Towards an understanding of nucleon spin structure: from hard to soft scales
• AAK24: Global QCD analysis on polarized parton distribution in the presence of $A_2$ asymmetry measurements