${{\mathit \tau}}$-DECAY PARAMETERS

($\xi \kappa )({{\mathit \mu}}$) PARAMETER

INSPIRE   JSON  (beta) PDGID:
S035XKM
($\mathit V−\mathit A$) theory predicts ($\xi \kappa )({{\mathit \mu}}$) = 0.
VALUE EVTS DOCUMENT ID TECN  COMMENT
$0.8$ $\pm0.5$ $\pm0.3$ 71k 1, 2
SHIMIZU
2018A
 BELL ${{\mathit \tau}^{-}}$ $\rightarrow$ ${{\mathit \nu}_{{{\tau}}}}{{\mathit \mu}^{-}}{{\overline{\mathit \nu}}_{{{\mu}}}}{{\mathit \gamma}}$
1  SHIMIZU 2018A measurement procedure fits a distribution affected by ${{\overline{\mathit \eta}}}({{\mathit \mu}}$), $\xi \kappa ({{\mathit \mu}}$) and ${{\mathit \eta}^{''}}({{\mathit \mu}}$), floating ${{\overline{\mathit \eta}}}({{\mathit \mu}}$) and $\xi \kappa ({{\mathit \mu}}$) and fixing ${{\mathit \eta}^{''}}({{\mathit \mu}}$) = 0. The contribution of ${{\mathit \eta}^{''}}({{\mathit \mu}}$) is suppressed by ${\mathit m}_{{{\mathit \mu}}}/{\mathit m}_{{{\mathit \tau}}}$.
2  Error correlated with SHIMIZU 2018A ($\xi \kappa )({{\mathit e}}$ or ${{\mathit \mu}}$) value.
References