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Home > Research > Publications & Outputs > Search for CP violation in the decay Z → τ+τ−
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Search for CP violation in the decay Z → τ+τ−

Research output: Contribution to journalJournal article

Published

Journal publication date1995
JournalPhysics Letters B
Journal number3-4
Volume346
Number of pages8
Pages371-378
Original languageEnglish

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 · cm, obtained with 19628 identified τ+τ− events. This gives an upper limit on the weak dipole form factor of · cm at the 95% confidence level.