K-Shell photodetachment of Li: Experiment and theory

CLEO Collaboration

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Abstract

We have measured the first and second moments of the hadronic mass-squared distribution in B→Xclv, for Plepton>1.5 GeV/c. We find(MX 2−MD −2)= 0.251 ± 0.66 GeV2,((MX 2−MX 2)2)=0.576 ± 0.170 GeV4, where M¯ Dis the spin-averaged D meson mass. From that first moment and the first moment of the photon energy spectrum in b→s γ, we find the heavy quark effective theory parameter λ1(in the modified minimal subtraction renormalization scheme, to order 1/MB 3and γ0αs 2) to be −0.24±0.11GeV2. Using these first moments and the B semileptonic width, and assuming parton-hadron duality, we obtain|Vcb|=0.0404±0.0013.

Original languageEnglish (US)
Pages (from-to)251808-251808-4
JournalPhysical Review Letters
Volume87
Issue number25
DOIs
StatePublished - Dec 17 2001

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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