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The European Physical Journal C
ISSN: 1434-6044 (printed version)
ISSN: 1434-6052 (electronic version)
Abstract Volume 2 Issue 1 (1998) pp 49-59
experimental physics:
Polarization and forward-backward asymmetry of $\Lambda$ baryons in hadronic Z$^0$ decays
OPAL Collaboration
, K. Ackerstaff et al. (8)
(8) CERN, European Organisation for Particle Physics, CH-1211 Geneva 23, Switzerland
Received: 30 July 1997
Abstract. The longitudinal polarization, the transverse polarization, and the forward-backward asymmetry of $\Lambda$ baryons, have been measured using a sample of 4.34 million hadronic $\mathrm{Z}^0$ decays collected with the OPAL detector at LEP between 1990 and 1995. These results are important as an aid to the understanding of hadronization mechanisms. Significant longitudinal polarization has been observed at intermediate and high momentum. For $x_E$ ($\equiv 2 E_{\Lambda}/\sqrt{s}) >$ 0.3, the longitudinal polarization has been measured to be $-32.9 \pm 5.5 $ (stat) $\pm$ 5.2 (syst)%. We have observed no transverse polarization. A significant forward-backward asymmetry has been measured and can be described by a JETSET model.
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Online publication: March 3, 1998
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