Observation and Properties of $L = 1 B_1$ and $B^*_2$ Mesons
Abazov, V. M. and others
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Abstract
Excited B mesons B_1 and B_2* are observed directly for the first time as two separate states in fully reconstructed decays to B_s16(*) pi-. The mass of B_1 is measured to be (5720.6 _s16- 2.4 _s16- 1.4) MeV/c^2 and the mass difference DeltaM between B_2* and B_1 is (26.2 _s16- 3.1 _s16- 0.9) MeV/c^2, giving the mass of the B_2* as (5746.8 _s16- 2.4 _s16- 1.7) MeV/c^2. The production rate for B_1 and B_2* mesons is determined to be a fraction (13.9 _s16- 1.9 _s16- 3.2)% of the production rate of the B_s16 meson.
