Inclusive production of neutral vector mesons in hadronic Z decays |
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| Authors: | ALEPH Collaboration, D. Buskulic, D. Casper, I. De Bonis, D. Decamp, P. Ghez, C. Goy, J. -P. Lees, A. Lucotte M. -N. Minard etAlia" >,et al. |
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| Affiliation: | ALEPH Collaboration, D. Buskulic, D. Casper, I. De Bonis, D. Decamp, P. Ghez, C. Goy, J. -P. Lees, A. Lucotte and M. -N. Minard, et al. |
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| Abstract: | A data sample of about 3.0 million hadronicZ decays collected by the ALEPH experiment at LEP in the years 1991 through 1994 is used to make an inclusive selection of B hadron events. In this event sample 4227±140±252B* mesons in the decayB*→Bγ and 1944±108±161B** u,d mesons decaying into a B meson and a charged pion are reconstructed. Here and in the followingB** u,d denotes the eightL=1(bū) and (bd) states and their charge conjugate. For the well establishedB* meson the following quantities are obtained:ΔM=M B*−MB=(45.30±0.35±0.87) MeV/c2 andN B*/(N B+N B*)=(77.1±2.6±7.0)%. The angular distribution of the photons in theB* rest frame is used to measure the relative contribution of longitudinalB* polarization states to beσ L/(σ L+σ T)=(33±6±5)%. |
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