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

Abstract

The non-factorizable terms in the operator product expansion have been recognized as one of theoretical obstacles for precision determination of the mixing parameter $V_{ub}$ from semileptonic B decays. It is pointed out here that the recent CLEO data on the parameters of the heavy quark expansion ${\lambda }_1$ and $\bar{\Lambda }$, combined with a theoretical bound on ${\lambda }_1$ 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 $V_{ub}$.

7 pages, 1 figure

References in corpus (2)

• Hadronic Mass Moments in Inclusive Semileptonic B Meson Decays
• Non-factorization effects in heavy mesons and determination of |V_{ub}| from inclusive semileptonic B decays

Cited by in corpus (4)

• The Heavy Quark Expansion for Inclusive Semileptonic Charm Decays Revisited
• Constraining weak annihilation using semileptonic D decays
• Charming Darwin: the evolution of QCD parameters across different species
• B meson semileptonic decays