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

Research output: Contribution to journalArticle

1 Citation (Scopus)

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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positron annihilation
quantum chromodynamics
fragmentation
electron-positron pairs
hyperons
cross sections
matrices
factorization
partons
equations of motion
interference
energy

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Cite this

Gamberg, Leonard ; Kang, Zhong Bo ; Pitonyak, Daniel ; Schlegel, Marc ; Yoshida, Shinsuke. / Polarized hyperon production in single-inclusive electron-positron annihilation at next-to-leading order. In: Journal of High Energy Physics. 2019 ; Vol. 2019, No. 1.
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Polarized hyperon production in single-inclusive electron-positron annihilation at next-to-leading order. / Gamberg, Leonard; Kang, Zhong Bo; Pitonyak, Daniel; Schlegel, Marc; Yoshida, Shinsuke.

In: Journal of High Energy Physics, Vol. 2019, No. 1, 111, 01.01.2019.

Research output: Contribution to journalArticle

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