${{\mathit \Xi}}$ DECAY PARAMETERS
See the ``Note on Baryon Decay Parameters'' in the neutron Listings.
$\phi _{-}$ ANGLE FOR ${{\mathit \Xi}^{-}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \pi}^{-}}$ (tan$\phi $ = $\beta /\gamma $)
INSPIRE search
| S022F |
| $\bf{
-1.5 \pm0.6}$
|
OUR AVERAGE
|
| $-0.92$ $\pm0.69$ ${}^{+0.23}_{-0.46}$ |
144k |
1 |
|
BES3 |
| $-2.39$ $\pm0.64$ $\pm0.64$ |
144M |
2 |
|
HYCP |
| $-1.61$ $\pm2.66$ $\pm0.37$ |
1.35M |
3 |
|
E756 |
| $5$ $\pm10$ |
11k |
|
|
LASS |
| $14.7$ $\pm16.0$ |
21k |
4 |
|
MPS |
| $11$ $\pm9$ |
4303 |
|
|
HBC |
| $5$ $\pm16$ |
2436 |
|
|
OSPK |
| $-14$ $\pm11$ |
2781 |
|
|
HBC |
| $0$ $\pm12$ |
1004 |
5 |
|
HBC |
| • • • We do not use the following data for averages, fits, limits, etc. • • • |
| $0.63$ $\pm1.09$ $\pm0.52$ |
73k |
6 |
|
BES3 |
| $1.32$ $\pm4.24$ $\pm0.17$ |
5.4k |
7 |
|
BES3 |
| $-26$ $\pm30$ |
2724 |
|
|
OSPK |
| $0$ $\pm20.4$ |
364 |
5 |
|
HBC |
| $54$ $\pm30$ |
356 |
5 |
|
HBC |
|
1
Converted from radians to degrees. ABLIKIM 2022BE reports a value of ($-1.6$ $\pm1.2$ ${}^{+0.4}_{-0.8}$) $ \times 10^{-2}$ radians.
|
|
2
From this result and $\alpha _{{{\mathit \Xi}}}$, HUANG 2004 gets $\beta _{{{\mathit \Xi}}}$ = $-0.037$ $\pm0.011$ $\pm0.010$ and $\gamma _{{{\mathit \Xi}}}$ = $0.888$ $\pm0.0004$ $\pm0.006$. And the strong p$-$s phase difference for ${{\mathit \Lambda}}{{\mathit \pi}^{-}}$ scattering is ($4.6$ $\pm1.4$ $\pm1.2)^\circ{}$.
|
|
3
From this result and $\alpha _{{{\mathit \Xi}}}$, CHAKRAVORTY 2003 obtains $\beta _{{{\mathit \Xi}}}$ = $-0.025$ $\pm0.042$ $\pm0.006$ and $\gamma _{{{\mathit \Xi}}}$ = $0.889$ $\pm0.001$ $\pm0.007$. And the strong p$-$s phase difference for ${{\mathit \Lambda}}{{\mathit \pi}^{-}}$ scattering is ($3.17$ $\pm5.28$ $\pm0.73)^\circ{}$.
|
|
4
BENSINGER 1985 used $\alpha _{\Lambda }$ = $0.642$ $\pm0.013$.
|
|
5
The errors have been multiplied by 1.2 due to approximations used for the ${{\mathit \Xi}}$ polarization; see DAUBER 1969 for a discussion.
|
|
6
Converted from radians to degrees. ABLIKIM 2022AD reports a value of ($1.1$ $\pm1.9$ $\pm0.9$) $ \times 10^{-2}$ radians.
|
|
7
Converted from radians to degrees. ABLIKIM 2022BE reports a value of ($2.3$ $\pm7.4$ $\pm0.3$) $ \times 10^{-2}$ radians.
|
|
| References: |
|
|
PRL 132 101801
|
Investigating the $\Delta I = 1/2$ rule and CP violation through the measurement of decay asymmetry parameters in $\Xi^-$ decays |
|
|
PR D106 L091101
|
Observation of hyperon transverse polarization in |
|
|
NAT 606 64
|
Probing CP symmetry and weak phases with entangled double-strange baryons |
|
|
PRL 93 011802
|
New Measurement of ${{\mathit \Xi}^{-}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \pi}^{-}}$ Decay Parameters |
|
|
PRL 91 031601
|
Measurement of Decay Parameters for ${{\mathit \Xi}^{-}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \pi}^{-}}$ Decay |
|
|
PR D32 2270
|
Inclusive Production of Multistrange Hyperons from 11 ${\mathrm {GeV/}}\mathit c$ ${{\mathit K}^{-}}$ ${{\mathit p}}$ Interactions |
|
|
NP B252 561
|
Measurement of Decay Parameters and Polarization in Inclusive ${{\mathit \Xi}^{-}}$ Production from ${{\mathit K}^{-}}$ ${{\mathit p}}$ Interactions |
|
|
PR D9 49
|
Properties of ${{\mathit \Xi}^{-}}$ and ${{\mathit \Xi}^{0}}$ Hyperons |
|
|
PR D10 792
|
Measurement of the Magnetic Moment and of the Decay Parameters of the ${{\mathit \Xi}^{-}}$ Hyperon |
|
|
|
PRL 29 1630 |
Measurement of the ${{\mathit \Xi}^{-}}$ Magnetic Moment |
|
|
PR D1 3010
|
Study of the Decay Parameters and Magnetic Moment of the ${{\mathit \Xi}^{-}}$ |
|
|
PR 179 1262
|
Production and Decay of Cascade Hyperons |
|
|
PR 147 945
|
Some Properties of ${{\mathit \Xi}^{-}}$ and ${{\mathit \Xi}^{0}}$ Hyperons Produced in ${{\mathit K}^{-}}$ ${{\mathit p}}$ Interactions between 1.05 and 1.7 ${\mathrm {GeV/}}\mathit c$ |
|
|
PR 143 1034
|
${{\mathit K}^{-}}$ ${{\mathit p}}$ Interaction at 2.24 BeV |
|
|
PRL 12 482
|
Properties of ${{\mathit \Xi}}$ Hyperons |
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