Extraction of quark transversity distribution and Collins fragmentation functions with QCD evolution

Zhong Bo Kang, Alexei Prokudin, Peng Sun, Feng Yuan

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129 Scopus citations

Abstract

We study the transverse-momentum-dependent (TMD) evolution of the Collins azimuthal asymmetries in e+e- annihilations and semi-inclusive hadron production in deep inelastic scattering processes. All the relevant coefficients are calculated up to the next-to-leading-logarithmic-order accuracy. By applying the TMD evolution at the approximate next-to-leading-logarithmic order in the Collins-Soper-Sterman formalism, we extract transversity distributions for u and d quarks and Collins fragmentation functions from current experimental data by a global analysis of the Collins asymmetries in back-to-back dihadron productions in e+e- annihilations measured by BELLE and BABAR collaborations and semi-inclusive hadron production in deep inelastic scattering data from HERMES, COMPASS, and JLab HALL A experiments. The impact of the evolution effects and the relevant theoretical uncertainties are discussed. We further discuss the TMD interpretation for our results and illustrate the unpolarized quark distribution, transversity distribution, unpolarized quark fragmentation, and Collins fragmentation functions depending on the transverse momentum and the hard momentum scale. We make detailed predictions for future experiments and discuss their impact.

Original languageEnglish (US)
Article number014009
JournalPhysical Review D
Volume93
Issue number1
DOIs
StatePublished - Jan 13 2016

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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