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

Barate, R. and Finch, Alexander (1997) Measurement of the transverse spin correlations in the decay Z → τ+τ−. Physics Letters B, 405 (1-2). pp. 191-201. ISSN 0370-2693

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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 τ 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.

Item Type: Article
Journal or Publication Title: Physics Letters B
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 64014
Deposited By: ep_importer_pure
Deposited On: 14 May 2013 15:48
Refereed?: Yes
Published?: Published
Last Modified: 20 Nov 2017 11:05
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/64014

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