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 tau pairs where both tau decay modes are identified. No evidence for CP-violation is observed. The weak dipole moment of the tau has been measured to be d(tau)(m(Z)) = (1.3 +/- 1.4 +/- 0.1) x 10(-17)excm which results in an upper timit on the weak dipole moment of |d(tau)(m(Z))| <= 3.7 x 10(-17)excm with 95% confidence level.
Search For CP Violation In Z->tau-tau
G. BATIGNANI;CIOCCI, MARIA AGNESE;FERRANTE, ISIDORO;FIDECARO, FRANCESCO;F. FORTI;MESSINEO, ALBERTO MARIA;TONELLI, GUIDO EMILIO;G. TRIGGIANI;
1992-01-01
Abstract
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 tau pairs where both tau decay modes are identified. No evidence for CP-violation is observed. The weak dipole moment of the tau has been measured to be d(tau)(m(Z)) = (1.3 +/- 1.4 +/- 0.1) x 10(-17)excm which results in an upper timit on the weak dipole moment of |d(tau)(m(Z))| <= 3.7 x 10(-17)excm with 95% confidence level.File in questo prodotto:
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