Document Type

Article

Publication Date

2019

DOI

10.1007/jhep01(2019)111

Publication Title

Journal of High Energy Physics

Volume

2019

Issue

1

Pages

111 (1-43)

Abstract

We study the production of polarized A-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 -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.

Comments

This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.

Original Publication Citation

Gamberg, L., Kang, Z. B., Pitonyak, D., Schlegel, M., & Yoshida, S. (2019). Polarized hyperon production in single-inclusive electron-positron annihilation at next-to-leading order. Journal of High Energy Physics, 2019(1), 111. doi:10.1007/jhep01(2019)111

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