Measurement of the Λb polarization in Z decays
D Buskulic, D Casper, I de Bonis, D Decamp, P Ghez, C Goy, JP Lees, A Lucotte, MN Minard, P Odier, B Pietrzyk, M Chmeissani, JM Crespo, I Efthymiopoulos, E Fernandez, M Fernandez-Bosman, L Garrido, A Juste, M Martinez, S Orteu Show all
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Published : 1996
The Λb polarization in hadronic Z decays is measured in semileptonic decays from the average energies of the charged lepton and the neutrino. In a data sample of approximately 3 million hadronic Z decays collected by the ALEPH detector at LEP between 1991 and 1994, 462 ± 31 Λb candidates are selected using (Λπ+)-lepton correlations. From this event sample, the Λb polarization is measured to be PΛb = -0.23+0.24-0.20 (stat.)+0.08-0.07(syst.).