Fig. 1: Illustration of the polarization vectors of Ξ− and Λ in relation to the decay parameters α, β and γ of the Ξ− → Λπ− decay. | Nature

Fig. 1: Illustration of the polarization vectors of Ξ− and Λ in relation to the decay parameters α, β and γ of the Ξ− → Λπ− decay.

From: Probing CP symmetry and weak phases with entangled double-strange baryons

Fig. 1

The Λ polarization \({{\mathscr{P}}}_{{{\Lambda }}^{-}}\) has a component in the longitudinal as well as the transverse direction, where the former (\(\hat{z}\)) is defined by the Λ momentum. The longitudinal component depends on the Λ emission angle and arises from the transferred Ξ− polarization \({{\mathscr{P}}}_{{{\Xi }}^{-}}\) combined with the decay parameter α. The remaining Ξ− polarization is transferred to the transverse components according to \({\beta }_{\varXi }{{\mathscr{P}}}_{{\varXi }^{-}}\) (\(\hat{x}\)) and \({\gamma }_{\varXi }{{\mathscr{P}}}_{\varXi }\) (\(\hat{y}\)). Quarks: d, down; s, strange; u, up; \(\bar{u}\), antiup.

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