Nucleon tensor charge from Collins azimuthal asymmetry measurements

Abstract

We investigate the nucleon tensor charge from current experiments by a combined analysis of the Collins asymmetries in two hadron production in $e^{+}{e}^{-}$ annihilations and semi-inclusive hadron production in deep inelastic scattering processes. The transverse momentum dependent evolution is taken into account, for the first time, in the global fit of the Collins fragmentation functions and the quark transversity distributions at the approximate next-to-leading logarithmic order. We obtain the nucleon tensor charge contribution from up and down quarks as $\delta u=+0.30_{-0.08}^{+0.12}$ and $\delta d=-0.20_{-0.11}^{+0.28}$ at 90\% confidence level for momentum fraction $0.0065\le x_B\le 0.35$ and $Q^2=$ 10 GeV${}^2$.

Version published in Physical Review - Rapid Communications, improved discussion, additional references and formulas added

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• Spin-flavor structure of chiral-odd GPDs in the large-N_c limit
• Realistic estimate of valence transversity distributions from inclusive dihadron production
• Spin Orbit Correlations and the Structure of the Nucleon
• Boer-Mulders function of the pion and pretzelosity distribution of the proton in the polarized pion-proton Drell-Yan process at COMPASS
• From C to Parton Sea: Bjorken-x Dependence of the PDFs
• Deep Neural Network extraction of Unpolarized Transverse Momentum Distributions