The Lambda(b) 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 Lambda(b) candidates are selected using (Lambda pi(+))-lepton correlations. From this event sample, the Lambda(b) polarization is measured to be P-Lambda b = -0.23(-0.20)(+0.24)(stat.)(-0.07)(+0.08)(syst.).
Measurement of the Lambda(b) polarization in Z decays
BATIGNANI, GIOVANNI;BETTARINI, STEFANO;CALDERINI, GIOVANNI;CIOCCI, MARIA AGNESE;FERRANTE, ISIDORO;FORTI, FRANCESCO;GIORGI, MARCELLO;MESSINEO, ALBERTO MARIA;RIZZO, GIULIANA;TONELLI, GUIDO EMILIO;
1996-01-01
Abstract
The Lambda(b) 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 Lambda(b) candidates are selected using (Lambda pi(+))-lepton correlations. From this event sample, the Lambda(b) polarization is measured to be P-Lambda b = -0.23(-0.20)(+0.24)(stat.)(-0.07)(+0.08)(syst.).File in questo prodotto:
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