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) 10-17 e . 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.

Search for CP violation in the decay Z → τ+τ− / D., B., D., C., I., D.B., D., D., P., G., C., G., J. P., L., M. N., M., P., O., B., P., F., A., M., C., J. M., C., I., E., E., F., M., F.B., V., G., Garrido, L.l., M., M., S., O., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 346:(1995), pp. 371-378. [10.1016/0370-2693(95)00093-Z]

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

GREGORIO, ANNA;BOSISIO, LUCIANO;GIANNINI, GIANROSSANO;
1995-01-01

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) 10-17 e . 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.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2563387
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