Polarization observables in the $e^{+}{e}^{-}\to \bar{\Lambda }\Lambda$ reaction

Abstract

Cross-section, vector-polarization, and tensor-polarization distributions are calculated for the reactions $e^{+}{e}^{-}\to \bar{p}p$ and $e^{+}{e}^{-}\to \bar{\Lambda }\Lambda$. Each reaction requires six characteristic functions that are bilinear in the, possibly complex, electromagnetic form factors, denoted $G_E(P^2)$ and $G_M(P^2)$, of $p$ and $\Lambda$. For the hyperon reaction also the joint-decay distributions of $\Lambda$ and $\bar{\Lambda }$ are calculated. Their knowledge allow a complete determination of the hyperon electromagnetic form factors, without measuring hyperon spins. We explain how this is done in practice. For some tensor-polarization components our results are in conflict with previously repeatedly published distributions.

arXiv comment17 pages

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