Measurement of the branching fraction

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Physics Letters B（2000）

引用 23|浏览14

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摘要

A study of b semileptonic decays into D, Dπ± and D∗π± final states is presented. The D0, D+ and D∗+ mesons are exclusively reconstructed in Z decay data recorded from 1992 to 1995 in the DELPHI experiment at LEP. The overall branching fractions are measured to be:BR(b→D0ℓ−ν̄ℓX)=(7.04±0.34(stat)±0.36(syst.exp)±0.17(BRD))%,BR(b→D+ℓ−ν̄ℓX)=(2.72±0.19(stat)±0.16(syst.exp)±0.18(BRD))%,BR(b→D∗+ℓ−ν̄ℓX)=(2.75±0.17(stat)±0.13(syst.exp)±0.09(BRD))%,where the D0 and D+ results include also contributions from D∗0 and D∗+ decays. A fit to the distribution of the π± impact parameter to the primary interaction vertex provides a measurement of the b semileptonic branching fractions into the D0π±X, D+π±X and D∗+π±X final states. Assuming that single pion decay modes of B mesons dominate, the partial rates for B̄→Dπℓ−νℓ̄ and B̄→D∗πℓ−νℓ̄ have been obtained, corresponding to a total branching fraction:BR(B̄→Dπℓ−νℓ̄)+BR(B̄→D∗πℓ−νℓ̄)=(3.40±0.52(stat)±0.32(syst))%.This result agrees well with the observed difference between the total B semileptonic branching fraction and the sum of the B̄→Dℓ−νℓ̄ and D∗ℓ−νℓ̄ branching fractions.

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decay,resonance

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