Measurement of the transverse spin correlation in Z --> tau+ tau- decays

Abreu, P.;Cortina Gil, Eduardo;DELPHI Collaboration;et.al.
(1997) Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 404, n° 1-2, p. 194-206 (1997)

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Abstract
The measurement of the correlation between the transverse spin components of τ+ τ− pairs collected during 1992 to 1994 with the DELPHI detector at LEPI is presented. A value Cπ = 0.87 ± 0.20 (stat.) −0.12+0.10 (syst.) was obtained for the correlation parameter, in agreement with the Standard Model expectation.
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Abreu, P., Cortina Gil, E., DELPHI Collaboration, & et al. (1997). Measurement of the transverse spin correlation in Z --> tau+ tau- decays. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, 404(1-2), 194-206. https://doi.org/10.1016/S0370-2693(97)00586-8 (Original work published 1997)