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

$\xi ({{\mathit e}}$) PARAMETER

INSPIRE   JSON  (beta) PDGID:
S035XE
($\mathit V−\mathit A$) theory predicts $\xi $ = 1.
VALUE EVTS DOCUMENT ID TECN  COMMENT
$\bf{ 0.994 \pm0.040}$ OUR FIT
$\bf{ 1.00 \pm0.04}$ OUR AVERAGE
$1.011$ $\pm0.094$ $\pm0.038$ 44k
HEISTER
2001E
 ALEP 1991--1995 LEP runs
$1.01$ $\pm0.12$ $\pm0.05$ 17k
ABREU
2000L
 DLPH 1992--1995 runs
$1.13$ $\pm0.39$ $\pm0.14$ 25k
ACKERSTAFF
1999D
 OPAL 1990--1995 LEP runs
$1.11$ $\pm0.20$ $\pm0.08$ 1
ALBRECHT
1998
ARG ${\it{}E}^{\it{}ee}_{\rm{}cm}$= $9.5 - 10.6$ GeV
$1.16$ $\pm0.52$ $\pm0.06$
ABE
1997O
 SLD 1993--1995 SLC runs
$0.979$ $\pm0.048$ $\pm0.016$ 34k
ALEXANDER
1997F
 CLEO ${\it{}E}^{\it{}ee}_{\rm{}cm}$= $10.6$ GeV
• • We do not use the following data for averages, fits, limits, etc. • •
$1.03$ $\pm0.23$ $\pm0.09$
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