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

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

INSPIRE   JSON  (beta) PDGID:
S035XM
($\mathit V−\mathit A$) theory predicts $\xi $ = 1.
VALUE EVTS DOCUMENT ID TECN  COMMENT
$\bf{ 1.030 \pm0.059}$ OUR FIT
$\bf{ 1.06 \pm0.06}$ OUR AVERAGE
$1.030$ $\pm0.120$ $\pm0.050$ 46k
HEISTER
2001E
 ALEP 1991--1995 LEP runs
$1.16$ $\pm0.19$ $\pm0.06$ 22k
ABREU
2000L
 DLPH 1992--1995 runs
$0.79$ $\pm0.41$ $\pm0.09$ 27k
ACKERSTAFF
1999D
 OPAL 1990--1995 LEP runs
$1.26$ $\pm0.27$ $\pm0.14$ 1
ALBRECHT
1998
ARG ${\it{}E}^{\it{}ee}_{\rm{}cm}$= $9.5 - 10.6$ GeV
$0.75$ $\pm0.50$ $\pm0.14$
ABE
1997O
 SLD 1993--1995 SLC runs
$1.054$ $\pm0.069$ $\pm0.047$ 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. • •
$1.23$ $\pm0.22$ $\pm0.10$
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