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${}^2$.

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

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