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

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 Older, outdated results have been omitted.

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

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.
$-0.034$ $\pm0.080$ 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:
BOURQUIN 1982
ZPHY C12 307 Measurements of Hyperon Semileptonic Decays at the CERN Super Proton Synchrotron. 1. The ${{\mathit \Sigma}^{-}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit e}^{-}}{{\overline{\mathit \nu}}_{{e}}}$ Decay Mode
THOMPSON 1980
PR D21 25 Studies in the BNL 21 ${\mathrm {GeV/}}\mathit c$ Negative Hyperon Beam. II. Leptonic Decays of ${{\mathit \Sigma}}$ and ${{\mathit \Xi}}$
TANENBAUM 1975B
PR D12 1871 Leptonic Decays of the ${{\mathit \Sigma}^{-}}$ and ${{\mathit \Xi}^{-}}$ Hyperons
FRANZINI 1972
PR D6 2417 Decay ${{\mathit \Sigma}^{\pm}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit e}^{\pm}}{{\mathit \nu}}$