${{\mathit \tau}}$ WEAK DIPOLE MOMENT ($\mathit d{}^{\mathit w}_{{{\mathit \tau}}}$)

A nonzero value is forbidden by $\mathit CP$ invariance.
The $\mathit q{}^{2}$ dependence is expected to be small providing no thresholds are nearby.

Re($\mathit d{}^{\mathit w}_{{{\mathit \tau}}}$)

INSPIRE   JSON  (beta) PDGID:
S035WDM
VALUE ($ 10^{-17} $ $\mathit e~$cm) CL% DOCUMENT ID TECN  COMMENT
$\bf{<0.50}$ 95 1
HEISTER
00F
 
ALEP $1990 - 1995$ LEP runs
• • We do not use the following data for averages, fits, limits, etc. • •
$<3.0$ 90 1
ACCIARRI
99C
 
L3 1991--1995 LEP runs
$<0.56$ 95
ACKERSTAFF
99L
 
OPAL 1991--1995 LEP runs
$<0.78$ 95 2
AKERS
99F
 
OPAL Repl. by ACKERSTAFF 1997L
$<1.5$ 95 2
BUSKULIC
99C
 
ALEP Repl. by HEISTER 2003F
$<7.0$ 95 2
ACTON
99F
 
OPAL ${{\mathit Z}}$ $\rightarrow$ ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ at LEP
$<3.7$ 95 2
BUSKULIC
99J
 
ALEP Repl. by BUSKULIC 1995C
1  Limit is on the absolute value of the real part of the weak dipole moment.
2  Limit is on the absolute value of the real part of the weak dipole moment, and applies for $\mathit q{}^{2}$ = ${{\mathit m}^{2}}_{{{\mathit Z}}}$.
Conservation Laws:
$\mathit CP$ INVARIANCE
References