Measurement of Semileptonic Branching Fractions of B Mesons to Narrow D** States

Abstract

Using the data accumulated in 2002-2004 with the DO detector in proton-antiproton collisions at the Fermilab Tevatron collider with centre-of-mass energy 1.96 TeV, the branching fractions of the decays B -> \bar{D}_1^0(2420) μ^+ ν_μX and B -> \bar{D}_2^{*0}(2460) μ^+ ν_μX and their ratio have been measured: BR(\bar{b}->B) \cdot BR(B-> \bar{D}_1^0 μ^+ ν_μX) \cdot BR(\bar{D}_1^0 -> D*- pi+) = (0.087+-0.007(stat)+-0.014(syst))%; BR(\bar{b}->B)\cdot BR(B->D_2^{*0} μ^+ ν_μX) \cdot BR(\bar{D}_2^{*0} -> D*- π^+) = (0.035+-0.007(stat)+-0.008(syst))%; and (BR(B -> \bar{D}_2^{*0} μ^+ ν_μX)BR(D2*0->D*- pi+)) / (BR(B -> \bar{D}_1^{0} μ^+ ν_μX)\cdot BR(\bar{D}_1^{0}->D*- π^+)) = 0.39+-0.09(stat)+-0.12(syst), where the charge conjugated states are always implied.

arXiv commentsubmitted to Phys. Rev. Lett

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