Polarisation measurement using leptonic τ decays

• Published in: Nuclear physics. Section B, Proceedings supplement Vol. 55; no. 3; pp. 49 - 56
• Main Author: Kounine, A.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-05-1997
• ISSN: 0920-5632; 1873-3832
• DOI: 10.1016/S0920-5632(97)00199-0

A precision measurement of
τ polarisation at LEP tests neutral couplings of
τ leptons providing therefore a stringent test of the Standard Model predictions. The polarisation measurement using leptonic
τ decays which constitute an important part of this analysis is discussed with a special emphasis on the analysis of the systematic errors. This measurement is based on approximately 600 000 Z →
τ
+
τ
− decays collected by the four LEP experiments during the 1990–1994 running periods.