Properties of L=1 B1 and B2* Mesons.

2007
This Letter presents the first strong evidence for the resolution of the excited B mesonsB 1 and B 2 * as two separate statesin fully reconstructed decays to B +(*) π - . The mass of B 1 is measured to be 5720.6 ± 2.4 ± 1.4 MeV/c 2 and the mass difference AM between B* 2 and B 1 is 26.2 ± 3.1 ± 0.9 MeV/c 2 , giving the mass of the B * 2 as 5746.8 ± 2.4 ± 1.7 MeV/c 2 . The production rate for B 1 and B* 2 mesonsis determined to be a fraction (13.9 ± 1.9 ± 3.2)% of the production rate of the B+ meson.
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