Spin Observables in Antilambda-Lambda Production from Antiproton-Proton Annihilation with a Transverse Inital State Polarization

TL;DR

This paper reviews the formalism for spin observables in antilambda-lambda production from antiproton-proton annihilation, emphasizing how transverse target polarization enables complete determination of the reaction's spin structure, with implications for recent experimental data.

Contribution

It demonstrates that transverse target polarization uniquely allows full access to the spin observables in antilambda-lambda production, expanding beyond previous focus areas.

Findings

Transverse polarization can fully determine the reaction's spin structure.

Additional measurements with beam and target polarization offer no extra sensitivity.

Relevance to recent LEAR experiment data.

Abstract

The formalism describing the scattering of two spin-1/2 objects is reviewed for the case of antilambda-lambda production from antiproton-proton annihilation. It is shown that an experiment utilizing a transverse target polarization can, in principle, completely determine the spin structure of the reaction. Additional measurements, even those using both beam and target polarizations, would not be sensitive to any additional spin dynamics. Thus, the transverse target polarization allows access to the complete set of spin observables, not just the subset upon which the literature has previously focused. This discussion is especially relevant in light of the data collected by PS185/3 at LEAR.