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

Understand

We study the production of polarized $\Lambda$-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 $\Lambda$-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.