## Abstract

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 language | English |
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Pages (from-to) | 5620-5628 |

Number of pages | 9 |

Journal | Physical Review D - Particles, Fields, Gravitation and Cosmology |

Volume | 54 |

Issue number | 9 |

DOIs | |

Publication status | Published - 1996 |

## All Science Journal Classification (ASJC) codes

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