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Title

Measurement of the moments of the hadronic invariant mass distribution in semileptonic B decays

CollaborationWith : Campanelli, Mario / Clark, Allan Geoffrey / Donega, Mauro / D'Onofrio, Monica / Lister, Alison / Liu, Yanwen / Wu, Xin / Zsenei, Andras
Published in Physical Review. D. 2005, vol. 71, no. 05, p. 051103
Abstract Using 180 pb−1 of data collected with the CDF II detector at the Tevatron, we measure the first two moments of the hadronic invariant mass-squared distribution in charmed semileptonic B decays. From these we determine the nonperturbative Heavy Quark Effective Theory parameters Λ and λ1 used to relate the B meson semileptonic branching ratio to the CKM matrix element |Vcb|. For a minimum lepton momentum of 0.7 GeV/c in the B rest frame we measure the first two moments of the D**→D(*)π component to be ⟨m2D**⟩=(5.83±0.16stat±0.08syst)  GeV2/c4 and ⟨(m2D**−⟨m2D**⟩)2⟩=(1.30±0.69stat±0.22syst)  GeV4/c8. Combining these with the discrete mass terms from the D and D∗ mesons, we find the total moments to be ⟨M2Xc⟩−m2D=(0.467±0.038stat±0.068syst)  GeV2/c4 and ⟨(M2Xc−⟨M2Xc⟩)2⟩=(1.05±0.26stat±0.13syst)  GeV4/c8, where mD is the spin-averaged D mass. The systematic error is dominated by the uncertainties in the world-average branching ratios used to combine the D, D∗, and D** contributions. The analysis makes no assumptions about the shape or resonant structure of the D**→D(*)π invariant mass distribution.
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CDF COLLABORATION. Measurement of the moments of the hadronic invariant mass distribution in semileptonic B decays. In: Physical Review. D, 2005, vol. 71, n° 05, p. 051103. https://archive-ouverte.unige.ch/unige:38305

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Deposited on : 2014-06-30

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