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A precise measurement of the tau polarisation at LEP-1

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A precise measurement of the tau polarisation at LEP-1

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dc.contributor.author	DELPHI Collaboration
dc.contributor.author	Alemany Fernández, Reyes
dc.contributor.author	Cabrera Urbán, Susana
dc.contributor.author	Castillo Giménez, María Victoria
dc.contributor.author	Cortina Gil, Eduardo
dc.contributor.author	Ferrer Soria, Antonio
dc.contributor.author	Fuster Verdú, Juan A.
dc.contributor.author	García García, Carmen
dc.contributor.author	Gil Botella, Inés
dc.contributor.author	Hernández Rey, Juan José
dc.contributor.author	Higón Rodríguez, Emilio
dc.contributor.author	Martínez Vidal, Fernando
dc.contributor.author	Navas Concha, Sergio
dc.contributor.author	Salt Cairols, José
dc.date.accessioned	2014-03-29T12:34:15Z
dc.date.available	2014-03-29T12:34:15Z
dc.date.issued	2000
dc.identifier.citation	DELPHI Collaboration Alemany, R. Cabrera Urbán, Susana Castillo Giménez, María Victoria Cortina, E. Ferrer Soria, Antonio Fuster Verdú, Juan A. García García, Carmen Gil, I. Hernández Rey, Juan José Higón Rodríguez, Emilio Martínez Vidal, Fernando Navas, S. Salt Cairols, José 2000 A precise measurement of the tau polarisation at LEP-1 European Physical Journal C 14 585 611
dc.identifier.uri	http://hdl.handle.net/10550/33802
dc.description.abstract	The τ polarisation has been studied with the \eett data collected by the DELPHI detector at LEP in 1993, 1994 and 1995 around the \Z resonance firstly through the exclusive decay channels \rm eννˉ, μννˉ, πν, ρν and \aoneν and secondly with an inclusive hadronic analysis which benefits from a higher efficiency and a better systematic precision. The results have been combined with those previously published on 1990 to 1992 DELPHI data, to produce results which reflect the full LEP-1 statistics. The fit of the τ polarisation dependence on the production angle yielded the polarisation parameters \atau=0.1359±0.0096 and \aele=0.1382±0.0116. From these results the ratio of the vector and axial-vector effective couplings \barvt/\barat=0.0683±0.0048 and \barve/\barae=0.0694±0.0058 have been derived, compatible with e−τ universality. With the assumption of lepton universality,the ratio of vector to axial-vector effective couplings for leptons \barvl/\baral=0.0687±0.0037 was obtained, implying a value of the effective weak mixing angle \s2thw=0.23282±0.00092.
dc.relation.ispartof	European Physical Journal C, 2000, vol. 14, p. 585-611
dc.subject	Física nuclear
dc.subject	Partícules (Física nuclear)
dc.title	A precise measurement of the tau polarisation at LEP-1
dc.type	journal article	es_ES
dc.date.updated	2014-03-29T12:34:15Z
dc.identifier.doi	10.1007/s100520000363
dc.identifier.idgrec	006701
dc.rights.accessRights	open access	es_ES
dc.identifier.url	10.1007/s100520000363