Transversity and Collins functions from SIDIS and e+e- data

作者: M. Anselmino , M. Boglione , U. D’Alesio , A. Kotzinian , F. Murgia

DOI: 10.1103/PHYSREVD.75.054032

关键词: PhysicsElectronProtonNuclear physicsParticle identificationAsymmetryQuarkDistribution functionFragmentation functionDeep inelastic scatteringParticle physics

摘要: A global analysis of the experimental data on azimuthal asymmetries in semi-inclusive deep inelastic scattering (SIDIS), from HERMES and COMPASS Collaborations, ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{h}_{1}{h}_{2}X$ processes, Belle Collaboration, is performed. It results extraction Collins fragmentation function and, for first time, transversity distribution $u$ $d$ quarks. These turn out to have opposite signs be sizably smaller than their positivity bounds. Predictions asymmetry ${A}_{UT}^{\mathrm{sin}({\ensuremath{\phi}}_{S}+{\ensuremath{\phi}}_{h})}$, as will soon measured at JLab operating a transversely polarized proton target, are then presented.

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