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

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

INSPIRE   JSON  (beta) PDGID:
S035DXM
($\mathit V−\mathit A$) theory predicts ($\delta \xi $) = $0.75$.
VALUE EVTS DOCUMENT ID TECN  COMMENT
$\bf{ 0.778 \pm0.037}$ OUR FIT
$\bf{ 0.79 \pm0.04}$ OUR AVERAGE
$0.786$ $\pm0.066$ $\pm0.028$ 46k
HEISTER
2001E
 ALEP 1991--1995 LEP runs
$0.86$ $\pm0.13$ $\pm0.04$ 22k
ABREU
2000L
 DLPH 1992--1995 runs
$0.63$ $\pm0.23$ $\pm0.05$ 27k
ACKERSTAFF
1999D
 OPAL 1990--1995 LEP runs
$0.73$ $\pm0.18$ $\pm0.10$ 1
ALBRECHT
1998
ARG ${\it{}E}^{\it{}ee}_{\rm{}cm}$= $9.5 - 10.6$ GeV
$0.82$ $\pm0.32$ $\pm0.07$
ABE
1997O
 SLD 1993--1995 SLC runs
$0.786$ $\pm0.041$ $\pm0.032$ 22k
ALEXANDER
1997F
 CLEO ${\it{}E}^{\it{}ee}_{\rm{}cm}$= $10.6$ GeV
• • We do not use the following data for averages, fits, limits, etc. • •
$0.71$ $\pm0.14$ $\pm0.06$
BUSKULIC
1995D
 ALEP Repl. by HEISTER 2001E
1  ALBRECHT 1998 use tau pair events of the type ${{\mathit \tau}^{-}}$ ${{\mathit \tau}^{+}}$ $\rightarrow({{\mathit \ell}^{-}}{{\overline{\mathit \nu}}_{{{{{\mathit \ell}}}}}}{{\mathit \nu}_{{{\tau}}}})({{\mathit \pi}^{+}}{{\mathit \pi}^{0}}{{\overline{\mathit \nu}}_{{{\tau}}}}$), and their charged conjugates.
References