We measure the relative rate of production of orbitally excited
(L = 1) states of B mesons (B**) by observing their decays into B pi+/-.
We reconstruct B mesons through semileptonic decay channels using data
collected in p anti-p collisions at s**(1/2) = 1.8 TeV. The fraction of light B
mesons that are produced as L = 1 B** states is measured to be 0.28 +/-
0.06(stat) +/- 0.03(syst). We also measure the collective mass of the B**
states, and quantify the result by quoting the (model-dependent) mass of the
lowest B** state to be m(B_1) = 5.71 +/- 0.02 GeV/c2.
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Updated: Tuesday, 2001 November 20 14:37:58 CST automatically from input from Carol Picciolo