Polarized hyperon production in single-inclusive electron-positron annihilation at next-to-leading order

Leonard Gamberg, Zhong Bo Kang, Daniel Pitonyak, Marc Schlegel, Shinsuke Yoshida

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Abstract

We study the production of polarized Λ-hyperons in electron-positron annihilation. We are particularly interested in the transverse-spin dependence of the cross section for unpolarized incident electron-positron pairs. At high energies this process may be described in the collinear twist-3 framework, where the hadronization transition of partons into a transversely polarized Λ-hyperon can be written in terms of collinear twist-3 fragmentation matrix elements. We calculate the hard partonic cross sections and interference terms in perturbative QCD to next-to-leading order accuracy. We find that the QCD equation of motion plays a crucial role in our analysis. As a byproduct, assuming the validity of QCD factorization for twist-3 observables at next-to-leading order, we derive the evolution equation for the relevant twist-3 fragmentation matrix element.

Original languageEnglish (US)
Article number111
JournalJournal of High Energy Physics
Volume2019
Issue number1
DOIs
StatePublished - Jan 1 2019

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All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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