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${{\mathit \Lambda}}$ DECAY PARAMETERS

See the ``Note on Baryon Decay Parameters'' in the neutron Listings. Some early results have been omitted.

$\alpha _{+}$ FOR ${{\overline{\mathit \Lambda}}}$ $\rightarrow$ ${{\overline{\mathit p}}}{{\mathit \pi}^{+}}$

INSPIRE   PDGID:

S018A+

VALUE EVTS DOCUMENT ID TECN  COMMENT $\bf{ -0.757 \pm0.004}$ OUR AVERAGE $-0.763$ $\pm0.011$ $\pm0.007$ 73k ABLIKIM 2022 AD BES3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \Xi}}{{\overline{\mathit \Xi}}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\overline{\mathit \Lambda}}}{{\mathit \pi}}{{\mathit \pi}}$ $-0.7559$ $\pm0.0036$ $\pm0.0030$ 3.2M ABLIKIM 2022 AG BES3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\overline{\mathit \Lambda}}}$ $-0.758$ $\pm0.010$ $\pm0.007$ 420k ABLIKIM 2019 BJ BES3 ${{\mathit J / \psi}}$ to ${{\mathit \Lambda}}{{\overline{\mathit \Lambda}}}$ • • We do not use the following data for averages, fits, limits, etc. • • $-0.755$ $\pm0.083$ $\pm0.063$ 8.7k ABLIKIM 2010 BES ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\overline{\mathit \Lambda}}}$ $-0.63$ $\pm0.13$ 770 TIXIER 1988 DM2 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\overline{\mathit \Lambda}}}$

References:

ABLIKIM 2022AG PRL 129 131801 Precise Measurements of Decay Parameters and $CP$ Asymmetry with Entangled $\Lambda-\bar{\Lambda}$ Pairs Pairs ABLIKIM 2022AD NAT 606 64 Probing CP symmetry and weak phases with entangled double-strange baryons ABLIKIM 2019BJ NATP 15 631 Polarization and Entanglement in Baryon-Antibaryon Pair Production in Electron-Positron Annihilation ABLIKIM 2010 PR D81 012003 Measurement of the Asymmetry Parameter for the Decay ${{\overline{\mathit \Lambda}}}$ $\rightarrow$ ${{\overline{\mathit p}}}{{\mathit \pi}^{+}}$ TIXIER 1988 PL B212 523 Looking at $\mathit CP$ Invariance and Quantum Mechanics in ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\overline{\mathit \Lambda}}}$ Decay

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