Data collected by ALEPH in the years 1990, 1991 and 1992 have been used to update a previous search for CP violation in the decay of the Z into τ+τ-. The measurement of the weak dipole form factor of the τ lepton has been performed by studying correlations between the τ leptons. No signal of CP violation was found. The weak dipole form factor is found to be d ̃τ = (+0.15 ± 0.58stat ± 0.38sys)10-17e · cm, obtained with 19628 identified τ+τ- events. This gives an upper limit on the weak dipole form factor of d ̃τ < 1.5 · 10-17 e · cm at the 95% confidence level.

Buskulic, D., Casper, D., Debonis, I., Decamp, D., Ghez, P., Goy, C., et al. (1995). Search for CP violation in the decay Z → τ+τ-. PHYSICS LETTERS. SECTION B, 346(3-4), 371-378 [10.1016/0370-2693(95)00093-Z].

Search for CP violation in the decay Z → τ+τ-

CARPINELLI, Massimo;
1995

Abstract

Data collected by ALEPH in the years 1990, 1991 and 1992 have been used to update a previous search for CP violation in the decay of the Z into τ+τ-. The measurement of the weak dipole form factor of the τ lepton has been performed by studying correlations between the τ leptons. No signal of CP violation was found. The weak dipole form factor is found to be d ̃τ = (+0.15 ± 0.58stat ± 0.38sys)10-17e · cm, obtained with 19628 identified τ+τ- events. This gives an upper limit on the weak dipole form factor of d ̃τ < 1.5 · 10-17 e · cm at the 95% confidence level.
Articolo in rivista - Articolo scientifico
Physics
English
371
378
8
Buskulic, D., Casper, D., Debonis, I., Decamp, D., Ghez, P., Goy, C., et al. (1995). Search for CP violation in the decay Z → τ+τ-. PHYSICS LETTERS. SECTION B, 346(3-4), 371-378 [10.1016/0370-2693(95)00093-Z].
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