${{\mathit \Xi}}$ DECAY PARAMETERS

See the ``Note on Baryon Decay Parameters'' in the neutron Listings.

$\phi $ ANGLE FOR ${{\overline{\mathit \Xi}}^{+}}$ $\rightarrow$ ${{\overline{\mathit \Lambda}}}{{\mathit \pi}^{+}}$ (tan$\phi $ = $\beta /\gamma $)

INSPIRE   PDGID:
S022F00
VALUE ($^\circ{}$) EVTS DOCUMENT ID TECN  COMMENT
$-1.20$ $\pm1.09$ $\pm0.40$ 73k 1
ABLIKIM
2022AD
 BES3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \Xi}}{{\overline{\mathit \Xi}}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\overline{\mathit \Lambda}}}{{\mathit \pi}}{{\mathit \pi}}$
• • We do not use the following data for averages, fits, limits, etc. • •
$-7.05$ $\pm4.18$ $\pm0.23$ 5.4k 2
ABLIKIM
2022BE
 BES3 ${{\mathit \psi}{(3686)}}$ $\rightarrow$ ${{\mathit \Xi}}{{\overline{\mathit \Xi}}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\overline{\mathit \Lambda}}}{{\mathit \pi}}{{\mathit \pi}}$
1  Converted from radians to degrees. ABLIKIM 2022AD reports a value of $-0.021$ $\pm0.019$ $\pm0.007$ radians.
2  Converted from radians to degrees. ABLIKIM 2022BE reports a value of $-0.123$ $\pm0.073$ $\pm0.004$ radians.
References:
ABLIKIM 2022AD
NAT 606 64 Probing CP symmetry and weak phases with entangled double-strange baryons
ABLIKIM 2022BE
PR D106 L091101 Observation of ?- hyperon transverse polarization in ?(3686)??-?¯+