The electroweak mixing angle is determined with high precision from measurements of the mean difference between forward and backward hemisphere charges in hadronic decays of the Z. A data sample of 2.5 million hadronic Z decays recorded over the period 1990 to 1994 in the ALEPH detector at LEP is used. The mean charge separation between event hemispheres containing the original quark and antiquark is measured for bb and cc events in subsamples selected by their long lifetimes or using fast D*'s. The corresponding average charge separation for light quarks is measured in an inclusive sample from the anticorrelation between charges of opposite hemispheres and agrees with predictions of hadronisation models with a precision of 2%. It is shown that differences between light quark charge separations and the measured average can be determined using hadronisation models, with systematic uncertainties constrained by measurements of inclusive production of kaons. * Now at CERN, 1211 Geneva 23 , Switzerland ^ Supported by Direccion General de Investigacion Cientifica y Tecnica, Spain ' N o w at Dipart imento di Fisica, Universi ta di Lecce, 73100 Lecce, Italy '' Also Istituto di Fisica Generate, Universita di Torino, Torino, Italy ^ Also Istituto di Cosmo-Geofisica del C.N.R., Torino, Italy * Supported by the Commiss ion of the European Communi t ies , contract ERBCHBICT941234 '' Supported by CICYT, Spain * Supported by the National Science Foundation of China ' Supported by the Danish Natural Science Research Counci l '" Supported by the U K Particle Physics and Astronomy Research Council ' ' Supported by the US Department of Energy, grant DE-FG0295-ER40896 '^ Also at Supercomputat ions Research Institute, Florida State University, Tallahassee, USA " Supported by the US Depar tment of Energy, contract DE-FG0592ER40742 '•* Supported by the US Department of Energy, contract DE-FC0585ER250000 " Permanent address: Universitat de Barcelona, 08208 Barcelona, Spain '* Supported by the Bundesminis ter ium fiir Forschung und Technologie, Germany " Supported by the Direction des Sciences de la Matiere, C.E.A. '* Supported by Fonds zur Forderung der wissenschaftlichen Forschung, Austria " Permanent address: Kangnung National University, Kangnung, Korea ^^ N o w at Dipart imento di Fisica, Universi ta di Milano, Milano, Italy ^' Also at CERN, 1211 Geneva 23 , Switzerland 22 Supported by the U S Department of Energy, grant DE-FGO3-92ER40689 23 N o w at Wayne State University, Detroit, MI 48202, U S A -* Now at Max-Plank-Institii t fiir Kemphysik , Heidelberg, Germany 2 ' Partially supported by Colciencias, Colombia 2 ' Also at Istituto di Matematica e Fisica, Universita di Sassari, Sassari, Italy 2 ' Now at Schuster Laboratory, University of Manchester , Manchester M 1 3 9PL, U K 2* Now at Colorado State University, Fort Collins, C O 80523, USA 2 ' Now at University of California at San Diego, La Jolla, CA 92093, USA 3" Now at Fermi National Accelerator Laboratory, Batavia, IL 60510. USA " Now at DESY, Hamburg , Germany protons and yl's. The separations are used to measure the electroweak mixing angle precisely as sin^ ef = 0.2322 ± 0.0008(exp. stat.) ±0.0007(exp. syst.) ± 0.0008(sep.). The first two errors are due to purely experimental sources whereas the third stems from uncertainties in the quark charge separations.

Determination of sin^ 6^^ using jet charge measurements in hadronic Z decays

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Determination of sin^ 6^^ using jet charge measurements in hadronic Z decays