Average kinetic energy of a heavy quark in semileptonic [Formula presented] decay

Dae Sung Hwang, C. S. Kim, Wuk Namgung

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)


Within the ACCMM model the average kinetic energy of the heavy quark in a heavy-light meson is calculated as [Formula presented] solely from the fact that the Gaussian momentum probability distribution has been taken in the ACCMM model. Therefore, the Fermi momentum parameter [Formula presented] of the ACCMM model is not a truly free parameter, but is closely related to the average kinetic energy of the heavy quark, which is theoretically calculable in principle. In this context, we determine [Formula presented] by comparing the theoretical prediction of the ACCMM model with the model-independent lepton energy spectrum of [Formula presented] from the recent CLEO analysis, and find that [Formula presented] GeV. We also calculate [Formula presented] in the relativistic quark model by applying the quantum mechanical variational method, and obtain [Formula presented] GeV. We show the correspondences between the relativistic quark model and the heavy quark effective theory. We then clarify the importance of the value of [Formula presented] in the determination of [Formula presented].

Original languageEnglish
Pages (from-to)5620-5628
Number of pages9
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number9
Publication statusPublished - 1996

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)


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