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

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

INSPIRE   PDGID:
S035DXE
($\mathit V−\mathit A$) theory predicts ($\delta \xi $) = $0.75$.
VALUE EVTS DOCUMENT ID TECN  COMMENT
$\bf{ 0.734 \pm0.028}$ OUR FIT
$\bf{ 0.731 \pm0.029}$ OUR AVERAGE
$0.778$ $\pm0.066$ $\pm0.024$ 44k
HEISTER
2001E
 ALEP 1991--1995 LEP runs
$0.85$ $\pm0.12$ $\pm0.04$ 17k
ABREU
2000L
 DLPH 1992--1995 runs
$0.72$ $\pm0.31$ $\pm0.14$ 25k
ACKERSTAFF
1999D
 OPAL 1990--1995 LEP runs
$0.56$ $\pm0.14$ $\pm0.06$ 1
ALBRECHT
1998
ARG ${\it{}E}^{\it{}ee}_{\rm{}cm}$= $9.5 - 10.6$ GeV
$0.85$ $\pm0.43$ $\pm0.08$
ABE
1997O
 SLD 1993--1995 SLC runs
$0.720$ $\pm0.032$ $\pm0.010$ 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. • •
$1.11$ $\pm0.17$ $\pm0.07$
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