Observation and Properties of L=1 B1 and B2* Mesons
Abstract
Excited B mesons B1 and B2* are observed directly for the first time as two separate states in fully reconstructed decays to B+(*) pi-. The mass of B1 is measured to be (5720.6 +- 2.4 +- 1.4) MeV/c2 and the mass difference DeltaM between B2* and B1 is (26.2 +- 3.1 +- 0.9) MeV/c2, giving the mass of the B2* as (5746.8 +- 2.4 +- 1.7) MeV/c2. The production rate for B1 and B2* mesons is determined to be a fraction (13.9 +- 1.9 +- 3.2)% of the production rate of the B+ meson.
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