Non-factorizable terms, heavy quark masses, and semileptonic decays of D and B mesons

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The non-factorizable terms in the operator product expansion have been recognized as one of the theoretical obstacles for precision determination of the mixing parameter Vub from semileptonic B decays. It is pointed out here that the recent CLEO data on the parameters of the heavy quark expansion λ1 and λ̄, combined with a theoretical bound on λ1 strongly favor the existence of a sizeable contribution of non-factorizable terms in semileptonic decays of D mesons. Thus these terms are likely to solve the long-standing problem of the deficit of semileptonic decay rate of the D mesons, and with better data their magnitude can be determined and used in studies of the parameter Vub.

Original languageEnglish (US)
Pages (from-to)245-251
Number of pages7
JournalModern Physics Letters A
Issue number4
StatePublished - Feb 10 2002

Bibliographical note

Funding Information:
I thank A. Czarnecki for an update on the status of perturbative calculations of semileptonic decay rates, R. Poling for a discussion of the CLEO work10 and D. Cronin-Hennessy for e-mail communication concerning the results of the CLEO analysis and the parameters of the nal plot in their paper. This work was supported in part by DOE under the grant number DE-FG02-94ER40823.


  • Hadronic matrix elements
  • Heavy quark masses
  • Semileptonic decays of D mesons


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