1995/02/28 by Dae Sung Hwang, C. S. Kim, Wuk Namgung +1 · 1 citation
Physics and Astronomy · #Black Holes and Theoretical Physics #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1007/s002880050010
published as Z.Phys.C69:107-112,1995 · 1. Section 2 has been revised by considering the fact that in the real experimental situation the only measured quantity is the number of events in the high $E_l$ region compared to the total semi- leptonic event number. 2. The article by C. Greub and D. Wyler (Phys. Lett. B295 (1992) 293) has been included in references, which reports a similar conclusion for the value of $p_{_F}$ ($p_{_F}$=566 MeV), even though they used the different approach. 3. This article will be published in Z. Phys. C (1995)
arxiv created 1995/04/29 · openalex publication_date 1995/12/01 · arxiv updated 2010/11/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The Gaussian width of Fermi momentum, pF, is the most important parameter of the ACCMM model, and its value is essential in the determination of |Vub/Vcb| because the experimental analysis is allowed only at the end-point region of inclusive semileptonic B-decay spectrum. We extract the value of |Vub/Vcb| as a function of pF. We also calculate the parameter pF in the relativistic quark model using the variational method, and obtain pF = 0.54 GeV which is much larger than the commonly used value, ∼ 0.3 GeV, in experimental analyses. When we use pF = 0.5 GeV instead of 0.3 GeV, the value of |Vub/Vcb| from ACCMM model is increased by a factor 1.81, and can give a good agreement with Isgur \it et al. model.