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EnglishUsing a sample of about 1.46 million hadronic Z decays collected between 1991 and 1993 with the ALEPH detector at LEP, the energy distribution of the B-0 and B-+/- mesons produced at the Z resonance is measured by reconstructing semileptonic decays B --> l nu(l)D(X) or B --> l nu(l)D*(+)(X). The charmed mesons are reconstructed through the decay modes D-0 --> K(-)pi(+), D-0, --> K(-)pi(+)pi(-)pi(+),D+ --> K(-)pi(+)pi(+), and D*(+) --> D-0 pi(+). The neutrino energy is estimated from the missing energy in the lepton hemisphere. Accounting for B* and B** production, the shape of the scaled energy distribution x(E)((b)) for mesons containing a b quark is compared to the predictions of different fragmentation models. The mean value of x(E)((b)) is found to be [x(E)((b))] = 0.715 +/- 0.007(stat) +/- 0.013(syst).
| Titolo: | MEASUREMENT OF THE EFFECTIVE B-QUARK FRAGMENTATION FUNCTION AT THE Z-RESONANCE |
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| Data di pubblicazione: | 1995 |
| Rivista: | |
| Digital Object Identifier (DOI): | http://dx.doi.org/10.1016/0370-2693(95)00988-W |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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