Single-spin asymmetries in the leptoproduction of transversely polarized $\Lambda$ hyperons

Abstract

We analyze single-spin asymmetries (SSAs) in the leptoproduction of transversely polarized $\Lambda$ hyperons within the collinear twist-3 formalism. We calculate both the distribution and fragmentation terms in two different gauges (lightcone and Feynman) and show that the results are identical. This is the first time that the fragmentation piece has been analyzed for transversely polarized hadron production within the collinear twist-3 framework. In lightcone gauge we use the same techniques that were employed in computing the analogous piece in $p^{\uparrow }p\to \pi X$, which has become an important part to that reaction. With this in mind, we also verify the gauge invariance of the formulas for the transverse SSA in the leptoproduction of pions.

12 pages, 1 figure, reference added, version to appear in Phys. Lett. B

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Cited by in corpus (5)

• Parton Fragmentation Functions
• Transverse spin observables in hard-scattering hadronic processes within collinear factorization
• Transverse polarization of the $\Lambda$ hyperon from unpolarized quark fragmentation in the diquark model
• Twist-3 Gluon Fragmentation Contribution to Polarized Hyperon Production in Unpolarized Proton-Proton Collision
• Transverse Nucleon Single-Spin Asymmetry for Single-Inclusive Hadron and Jet Production at NLO Accuracy