Abstract
The process B*→Bγ has been observed in a sample of approximately 4.1 million hadronic Z0 decays collected by the OPAL detector at LEP in the years 1991–1995. Inclusively reconstructed B mesons have been combined with converted photons to reconstruct approximately 1900 B* mesons. The B*–B mass difference is found to be ΔM(B* −B) = 46.2 ± 0.3 ± 0.8 MeV/c 2, and the rate of B* meson production relative to that of B mesons is found to be σ B*/σ B = 0.760 ± 0.036 ± 0.083, where the first errors are statistical and the second systematic. The angular distribution of the transition photon in the B* rest frame has been measured and the relative contribution of longitudinal B* polarization states found to be σ l/(σ l + σ t ) = 0.36 ± 0.06 ± 0.07, consistent with a simple spin counting picture. These results average over B0, B± and B 0s mesons.
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OPAL Collaboration. B* production in Z0 decays. Z Phys C - Particles and Fields 74, 413–423 (1997). https://doi.org/10.1007/s002880050404
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DOI: https://doi.org/10.1007/s002880050404