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Study of the four-fermion final state at the Z resonance

  • Experimental Physics
  • Published:
Zeitschrift für Physik C Particles and Fields

Abstract

The process e+e→, where l is a charged or a neutral lepton and f any charged fermion, is analyzed. The study uses the ALEPH data collected at LEP from 1989 to 1993 at centre-of-mass energies between 88 and 95 GeV, corresponding to almost two million hadronic Z decays and to a total integrated luminosity of 79 pb−1. For all channels, the data agree well with the standard model expectation both in shape and normalization. The indication of an excess in the\(e^ + e^ - \to \tau ^ + \tau ^ - f\bar f\) channel, reported by ALEPH in 1991, is not confirmed.

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Deceased.

Supported by CICYT, Spain

Supported by the National Science Foundation of China

Supported by the Danish Natural Science Research Council

Supported by the UK Science and Engineering Research Council

Supported by the US Department of Energy, contract DE-AC02-76ER00881

Supported by the US Department of Energy, contract DE-FG05-92ER40742

Supported by the US Department of Energy, contract DE-FC05-85ER250000

Supported by the Bundesministerium für Forschung und Technologie, Germany

Supported by the Direction des Sciences de la Matière, C.E.A.

Supported by Fonds zur Förderung der wissenschaftlichen Forschung, Austria

Supported by the US Department of Energy, grant DE-FG03-92ER40689

Partially supported by Colciencias, Colombia

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ALEPH Collaboration., Buskulic, D., Casper, D. et al. Study of the four-fermion final state at the Z resonance. Z. Phys. C - Particles and Fields 66, 3–18 (1995). https://doi.org/10.1007/BF01496576

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  • DOI: https://doi.org/10.1007/BF01496576

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