1994/11/03 by Hai-Yang Cheng, Cheng, Hai-Yang, B. Tseng +1
Physics and Astronomy · #Black Holes and Theoretical Physics #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/9411215
7 pages
arxiv created 1994/11/03 · openalex publication_date 1994/11/03 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The \b decay does not receive any nonspectator contributions and hence its theoretical calculation is relatively clean. Two different methods are employed for the study of \b. In the first method, both b and s quarks are treated as heavy and leading 1/ms as well as 1/mb corrections are included. The branching ratio and the asymmetry parameter α are found to be (0.7-1.5)× 10-3 and 0.18, respectively. In the second method, only the b quark is treated as heavy. The prediction of the decay rate is very sensitive to the choice of the q2 dependence for form factors. We obtain α=0.31 and \cal B(\b) ≃ 1.6× 10-4 for dipole q2 behavior as well as 8.2× 10-4 for monopole q2 dependence. We conclude that \cal B(\b)~\large ^<∼~10-3 and α is of order 0.20∼ 0.30 with a positive sign.