Measurement of the transverse spin correlations in the decay Z → τ+τ-
Abstract
A measurement of the transverse-transverse, CTT, and transverse-normal CTN, τ spin correlations in the decay Z0 → τ+τ- is presented based on the aplanarity angle of the decay products of both taus. Based on 80 pb -1 of data collected by ALEPH[1] in 1992, 1993 and 1994 on the peak of the Z resonance, the results are: CTT = 1.00 ± 0.14( stat) ± 0.04( syst), CTN =-0.08 ± 0.14( stat) ± 0.02( syst). These values are in agreement with the Standard Model predictions, CTT = 0.989 and CTN = 0.
- Publication:
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Nuclear Physics B Proceedings Supplements
- Pub Date:
- May 1997
- DOI:
- 10.1016/S0920-5632(97)00197-7
- Bibcode:
- 1997NuPhS..55...33S