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Title: Measurement of the Spectroscopy of Orbitally Excited B Mesons at LEP


 We measure the masses, decay widths and relative production rate of orbitally
 excited B mesons using 1.25 million hadronic Z decays recorded by the L3
 detector.  B-meson candidates are inclusively reconstructed and combined with
 charged pions produced at the primary event vertex.  An excess of events above
 the expected background in the B pi mass spectrum in the region
 5.6-5.8 GeV is interpreted as resulting from the decay
 B**_{UD} -> B(*) pi, where B**_{UD} denotes a mixture of l=1
 B-meson states containing a u or a d quark.  A fit to the mass
 spectrum yields the masses and decay widths of the $B*_{1}$ and $B*_{2}$
 spin states, as well as the branching fraction for the combination of l=1
 states.  In addition, evidence is presented for the existence of an excited
 B-meson state or mixture of states in the region 5.9-6.0 GeV.

parallel session #PA 7
plenary session #Pl 3

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* paper 181 *Phys. Lett. B 465/1-4 (21 October, 1999) 323-334.
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