${{\mathit \Lambda}}$ 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   JSON  (beta) PDGID:
S018A+
VALUE EVTS DOCUMENT ID TECN  COMMENT
$\bf{ -0.758 \pm0.005}$ OUR AVERAGE  Error includes scale factor of 1.2.
$-0.748$ $\pm0.016$ $\pm0.007$ 27k
AAIJ
2024AH
 LHCB ${{\mathit \Lambda}_{{{b}}}}$ $\rightarrow$ ${{\mathit \Lambda}_{{{c}}}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit h}^{+}}$
$-0.774$ $\pm0.009$ ${}^{+0.005}_{-0.005}$ 123k
ABLIKIM
2024AR
 BES3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \Xi}}{{\overline{\mathit \Xi}}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\overline{\mathit \Lambda}}}{{\mathit \pi}}{{\mathit \pi}}$
$-0.776$ $\pm0.054$ $\pm0.010$ 1.1M
ABLIKIM
2024CE
 BES3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \Sigma}}{{\overline{\mathit \Sigma}}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\overline{\mathit \Lambda}}}{{\mathit \gamma}}{{\mathit \gamma}}$
$-0.7559$ $\pm0.0036$ $\pm0.0030$ 3.2M
ABLIKIM
2022AG
 BES3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\overline{\mathit \Lambda}}}$
• • We do not use the following data for averages, fits, limits, etc. • •
$-0.763$ $\pm0.011$ $\pm0.007$ 73k
ABLIKIM
2022AD
 BES3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \Xi}}{{\overline{\mathit \Xi}}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\overline{\mathit \Lambda}}}{{\mathit \pi}}{{\mathit \pi}}$
$-0.758$ $\pm0.010$ $\pm0.007$ 420k
ABLIKIM
2019BJ
 BES3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\overline{\mathit \Lambda}}}$
$-0.755$ $\pm0.083$ $\pm0.063$ 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