For τ leptons produced in e+e-→ τ+τ-interactions there are, in addition to the longitudinal spin correlations, two independent transverse spin correlations associated with the transverse (within the production plane) and normal (to the production plane) polarization components. A measurement of the transverse-transverse and transverse-normal T spin correlations in the decay Z → τ+τ-, CTT and CTN, is presented based on the aplanarity angle of the decay products of both τ leptons. Using 80 pb-1 of data collected by ALEPH on the peak of the Z resonance, the results are CTT = 1.06±0.13(stat)±0.05(syst), and CTN = 0.08 ± 0.13(stat)±0.04(syst). These values are in agreement with the Standard Model predictions, CTT = 0.99 and CTN = -0.01.

Barate, R., Buskulic, D., Decamp, D., Ghez, P., Goy, C., Lees, J., et al. (1997). Measurement of the transverse spin correlations in the decay Z → τ+τ-. PHYSICS LETTERS. SECTION B, 405(1-2), 191-201 [10.1016/S0370-2693(97)00664-3].

Measurement of the transverse spin correlations in the decay Z → τ+τ-

CARPINELLI, Massimo;
1997

Abstract

For τ leptons produced in e+e-→ τ+τ-interactions there are, in addition to the longitudinal spin correlations, two independent transverse spin correlations associated with the transverse (within the production plane) and normal (to the production plane) polarization components. A measurement of the transverse-transverse and transverse-normal T spin correlations in the decay Z → τ+τ-, CTT and CTN, is presented based on the aplanarity angle of the decay products of both τ leptons. Using 80 pb-1 of data collected by ALEPH on the peak of the Z resonance, the results are CTT = 1.06±0.13(stat)±0.05(syst), and CTN = 0.08 ± 0.13(stat)±0.04(syst). These values are in agreement with the Standard Model predictions, CTT = 0.99 and CTN = -0.01.
Articolo in rivista - Articolo scientifico
Physics
English
191
201
11
Barate, R., Buskulic, D., Decamp, D., Ghez, P., Goy, C., Lees, J., et al. (1997). Measurement of the transverse spin correlations in the decay Z → τ+τ-. PHYSICS LETTERS. SECTION B, 405(1-2), 191-201 [10.1016/S0370-2693(97)00664-3].
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