Asymmetry of Lambda Baryons in Hadronic Z^0 Decays

Details Asymmetry of Lambda Baryons in Hadronic Z^0 Decays Asymmetry of Lambda Baryons in Hadronic Z^0 Decays

1997-08-19

arxiv.org/abs/hep-ex/9708027v1

Eur.Phys.J.C2:49-59,1998

Physics

High Energy Physics

High Energy Physics - Experiment

22 pages, LaTeX, uses a4p.sty, 5 eps figures included, submitted to Zeit. Phys. C

Scientific paper

10.1007/s100520050123

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 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 = 2 E_{Lambda}/\sqrt{s}) > 0.3, the longitudinal polarization has been measured to be -32.9 +/- 5.5(stat) +/- 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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