Measurement of the Average Polarization of b Baryons in Hadronic Z^0 Decays

Details Measurement of the Average Polarization of b Baryons in Hadronic Z^0 Decays Measurement of the Average Polarization of b Baryons in Hadronic Z^0 Decays

1998-08-10

arxiv.org/abs/hep-ex/9808006v1

Phys.Lett.B444:539-554,1998

Physics

High Energy Physics

High Energy Physics - Experiment

19 pages, LaTeX, 4 eps figures included, submitted to Phys. Lett. B

Scientific paper

10.1016/S0370-2693(98)01387-2

In the Standard Model, b quarks produced in e^+e^- annihilation at the Z^0 peak have a large average longitudinal polarization of -0.94. Some fraction of this polarization is expected to be transferred to b-flavored baryons during hadronization. The average longitudinal polarization of weakly decaying b baryons, , is measured in approximately 4.3 million hadronic Z^0 decays collected with the OPAL detector between 1990 and 1995 at LEP. Those b baryons that decay semileptonically and produce a \Lambda baryon are identified through the correlation of the baryon number of the \Lambda and the electric charge of the lepton. In this semileptonic decay, the ratio of the neutrino energy to the lepton energy is a sensitive polarization observable. The neutrino energy is estimated using missing energy measurements. From a fit to the distribution of this ratio, the value = -0.56^{+0.20}_{-0.13} +/- 0.09 is obtained, where the first error is statistical and the second systematic.

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