Abstract
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.
Publisher
Springer Science and Business Media LLC
Subject
Nuclear and High Energy Physics
Reference85 articles.
1. G. Bunce et al., Λ0
hyperon polarization in inclusive production by 300 GeV protons on beryllium, Phys. Rev. Lett.
36 (1976) 1113 [INSPIRE].
2. L. Schachinger et al., A precise measurement of the Λ0
magnetic moment, Phys. Rev. Lett.
41 (1978) 1348 [INSPIRE].
3. K.J. Heller et al., Polarization of Ξ0
and Λ hyperons produced by 400 GeV/c protons, Phys. Rev. Lett.
51 (1983) 2025 [INSPIRE].
4. B. Lundberg et al., Polarization in inclusive Λ and
$$ \overline{\Lambda} $$
production at large p
T, Phys. Rev.
D 40 (1989) 3557 [INSPIRE].
5. B.S. Yuldashev et al., Neutral strange particle production in p Ne-20 and pN interactions at 300 GeV/c, Phys. Rev.
D 43 (1991) 2792 [INSPIRE].
Cited by
19 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献