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Published May 25, 1995 | public
Journal Article Metadata-only

Measurement of the weak charged current structure in semileptonic b-hadron decays at the Z peak

Acciarri, M.
Gratta, G.
Kirkby, A.
Kirkby, D.
Lu, W.
Mount, R.
Newman, H. ORCID icon
Shevchenko, S.
Shi, X. R.
Zaccardelli, C.
Zhu, R. Y. ORCID icon
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Abstract

The neutrino energy spectrum in semileptonic b-hadron decays with identified energetic electrons and muons has been measured. The observed relative energy sharing between the neutrino and the cahrged lepton is found to be well described with a W± polarization obtained from a free b-quark decay model with a (Vf-A)×(Vf-A) decay structure. The alternative of a (V+A)×(Vf-A) decay structure is excluded with a significance of more than 6 standard deviations. The possibility that hadronic corrections to the b-hadron decay destroy any W± polarization is disfavored by more than 3 standard deviations.

Additional Information

© 1995 Elsevier B.V. Received 18 January 1995. Supported by the German Bundesministerium für Forschung und Technologie. Supported by the Hungarian OTKA fund under contract number 2970. Supported by CONICET and Universidad Nacional de la Plata, CC 67, 1900 La Plata, Argentina. For several useful discussions we would like to thank Z. Was, E. Richter-Was and I. Bigi. We also wish to express our gratitude to the CERN accelerator divisions for the excellent performance of the LEP machine. We acknowledge the contributions of all the engineers and technicians who participated in the construction and maintenance of this experiment.

Additional details

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August 20, 2023
Modified:
October 25, 2023