1997/01/18 by C. S. Kim
Physics and Astronomy · #Black Holes and Theoretical Physics #Computer science #Neutrino Physics Research #Particle physics theoretical and experimental studies #hep-ph
paper · pdf · doi:10.1016/s0920-5632(97)00433-7
published in Nuclear Physics B - Proceedings Supplements 59(1-3), 114-121 (Elsevier BV) · 9 pages(LaTeX), 1 Postscript figure
arxiv created 1997/01/18 · openalex publication_date 1997/11/01 · arxiv updated 2014/11/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
I first introduce the importance of measuring Vub precisely. Then, from a theoretician's point of view, I review (a) past history, (b) present trials, and (c) possible future alternatives on measuring |Vub| and/or |Vub/Vcb|. As of my main topic, I introduce a model-independent method, which predicts Γ(B -> Xu l ν) / Γ(B -> Xc l ν) ≡ (γu / γc) × | Vub / Vcb|2 ≃ (1.83 ± 0.28) × |Vub / Vcb|2 and |Vub/Vcb| ≡ (γc / γu)1/2 × [\calB(B -> Xu l ν)/\calB(B -> Xc l ν)]1/2 ≃ (0.74 ± 0.06) × [\calB(B -> Xu l ν)/ \calB(B -> Xc l ν)]1/2, based on the heavy quark effective theory. I also explore the possible experimental options to separate B -> Xu l νfrom the dominant B -> Xc l ν: the measurement of inclusive hadronic invariant mass distributions, and the `D - π' (and `K - π') separation conditions. I also clarify the relevant experimental backgrounds.