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arXiv 0812.2795hep-ph
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排斥半轻子B--> ρ衰变的|Vub|

|Vub| from Exclusive Semileptonic B--> rho Decays

Jonathan M Flynn, Yoshiyuki Nakagawa, Juan Nieves, Hiroshi Toki

摘要:

我们用全方位表示的半轻子B--> ρ衰变的形状因子V、A_1和A_2,并将它们用于结合实验的部分分支分数信息和三个形状因子的理论计算来提取|Vub| .我们发现一个稍低的结果,|Vub| =(2.8 +- 0.2)x 10^{-3},比从排他性半轻子B--> π衰变中提取的值,并使用CKM拟合中的所有其他输入。当我们与从包含B -> X_u l nu衰变中提取的结果比较时,分歧更大。

英文摘要:

We use Omnes representations of the form factors V, A_1 and A_2 for exclusive semileptonic B--> rho decays, and apply them to combine experimental partial branching fraction information with theoretical calculations of the three form factors to extract |Vub|. We find a slightly lower result, |Vub|=(2.8 +- 0.2)x 10^{-3}, than the values extracted from exclusive semileptonic B-->pi decays and using all other inputs in CKM fits. The disagreement is greater when we compare to the result extracted from inclusive B -> X_u l nu decays.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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