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arXiv 0801.0675hep-ph
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重味强子衰变的QCD计算

QCD Calculations of Decays of Heavy Flavor Hadrons

Matthias Neubert

摘要:

对标准模型的精确测试和对夸克味道领域新物理学的探索,依赖于对罕见的变味过程的衰变率和光谱的精确理论计算。理论状态和最近的发展技术允许这样的计算进行了审查。特别注意B->Xs+ γ分支比的计算,从B->Xc+l+nu矩的拟合中提取b夸克质量,以及|V(ub)|从包含性衰变B->Xu+1 +nu中的光谱。通过对不同包容性分布的重新分析,|V(ub)|=(3.98+-0.15+-0.30)*10^{-3}。仅使用理论上最干净的通道,我们得到|V(ub)|=(3.70+-0.15+-0.28)*10^{-3}。

英文摘要:

Precision tests of the Standard Model and searches for New Physics in the quark flavor sector depend on accurate theoretical calculations of decay rates and spectra for rare, flavor-changing processes. The theoretical status and recent developments of techniques allowing such calculations are reviewed. Special attention is paid to the calculation of the B->Xs+gamma branching ratio, the extraction of the b-quark mass from a fit to B->Xc+l+nu moments, and the determination of |V(ub)| from spectra in the inclusive decay B->Xu+l+nu. From a reanalysis of different inclusive distributions the updated average value |V(ub)|=(3.98+-0.15+-0.30)*10^{-3} is derived. Using only the theoretically cleanest channels, we obtain |V(ub)|=(3.70+-0.15+-0.28)*10^{-3}.

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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