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

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

R = $\vert G_{E}/G_{M}\vert $ in ${{\mathit \Lambda}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \pi}^{-}}$, ${{\overline{\mathit \Lambda}}}$ $\rightarrow$ ${{\overline{\mathit p}}}{{\mathit \pi}^{+}}$

INSPIRE   JSON  (beta) PDGID:
S018A02
S018A02
VALUE EVTS DOCUMENT ID TECN  COMMENT
• • We do not use the following data for averages, fits, limits, etc. • •
$0.91$ $\pm0.08$ $\pm0.02$ 1, 2
ABLIKIM
2025BQ
 
BES3 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\overline{\mathit \Lambda}}}{{\mathit \Lambda}}$ at $\sqrt {s }$ = 2.396 GeV
$0.47$ $\pm0.08$ $\pm0.05$ 2.2k 3
ABLIKIM
2025CK
 
BES3 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\overline{\mathit \Lambda}}}{{\mathit \Lambda}}$ at $\sqrt {s }$ = 3.773 GeV
$0.96$ $\pm0.14$ $\pm0.02$ 4
ABLIKIM
2019BF
 
BES3 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\overline{\mathit \Lambda}}}{{\mathit \Lambda}}$ at $\sqrt {s }$ = 2.396 GeV
1  ABLIKIM 2025BQ provides values in a range of $\sqrt {s }$ energies of $2.396 - 2.90$ GeV. We quote their most precise value at 2.396 GeV.
2  Determined using asymmetry parameter value $\alpha $ = $0.754$.
3  Determined using asymmetry parameter value ${{\mathit \alpha}}$ = $0.7542$.
4  Determined using asymmetry parameter value ${{\mathit \alpha}}$ = $0.750$ $\pm0.010$.
References