${{\mathit \Sigma}^{-}}$ DECAY PARAMETERS

See the ``Note on Baryon Decay Parameters'' in the neutron Listings. Older, outdated results have been omitted.

${\mathit g}_{{{\mathit V}}}/{\mathit g}_{{{\mathit A}}}$ FOR ${{\mathit \Sigma}^{-}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit e}^{-}}{{\overline{\mathit \nu}}_{{{e}}}}$

INSPIRE   PDGID:
S020AV
For the sign convention, see the ``Note on Baryon Decay Parameters'' in the neutron Listings. The value is predicted to be zero by conserved vector current theory. The values averaged assume CVC-SU(3) weak magnetism term.
VALUE EVTS DOCUMENT ID TECN  COMMENT
$\bf{ 0.01 \pm0.10}$ OUR AVERAGE  Error includes scale factor of 1.5.  See the ideogram below.
$-0.034$ $\pm0.080$ 1620 1
BOURQUIN
1982
SPEC SPS hyperon beam
$-0.29$ $\pm0.29$ 114
THOMPSON
1980
ASPK BNL hyperon beam
$-0.17$ $\pm0.35$ 55
TANENBAUM
1975B
SPEC BNL hyperon beam
$+0.45$ $\pm0.20$ 186 2, 1
FRANZINI
1972
HBC
1  The sign has been changed to agree with our convention.
2  The FRANZINI 1972 value includes the events of earlier papers.

           ${\mathit g}_{{{\mathit V}}}/{\mathit g}_{{{\mathit A}}}$ for ${{\mathit \Sigma}^{-}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit e}^{-}}{{\overline{\mathit \nu}}_{{{e}}}}$
References