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${{\mathit \Sigma}^{-}}$ 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 Older, outdated results have been omitted.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 1975 B 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 ${{\mathit \Sigma}^{\pm}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit e}^{\pm}}{{\mathit \nu}}$

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