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Search for CP violation in Z ---> tau tau

The ALEPH collaboration Buskulic, D. ; Decamp, D. ; Goy, C. ; et al.
Phys.Lett.B 297 (1992) 459-468, 1992.
Inspire Record 341557 DOI 10.17182/hepdata.48510

Using the 18.8 pb −1 of data accumulated at LEP in 1990 and 1991 with the ALEPH detector, a direct test of neutral current CP -invariance is performed by a search for CP -odd correlations in Z decays to τ pairs where both τ decay modes are identified. No evidence for CP -violation is observed. The weak dipole moment of the τ has been measured to be d τ ( m Z ) = (1.3 ± 1.4 ± 0.1) × 10 −17 e ·cm which results in an upper limit on the weak dipole moment of | d τ ( m Z )| ⩽ 3.7 × 10 −17 e ·cm with 95% confidence level.

1 data table
Table 1

No description provided.


Measurement of the Z0 line shape parameters and the electroweak couplings of charged leptons

The OPAL collaboration Alexander, G. ; Allison, John ; Allport, P.P. ; et al.
Z.Phys.C 52 (1991) 175-208, 1991.
Inspire Record 315269 DOI 10.17182/hepdata.14859

None

11 data tables
Table 1

DATA FROM 1989 RUN. The cross section are quoted with their statistical and point-to-point systematic uncertainty of both the multihadron acceptance and the luminosity calculation.

Table 2

DATA FROM 1990 RUN. The cross section are quoted with their statistical and point-to-point systematic uncertainty of both the multihadron acceptance and the luminosity calculation.

Table 3

Cross sections corrected for the effects of efficiency and kinematic cuts and background. Data from 1989 run, reanalysed.

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