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arXiv 1201.2563hep-phhep-exhep-lat
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完成标准模型以外的树级非轻子δ F = 1衰变的NLO QCD修正

Completing NLO QCD Corrections for Tree Level Non-Leptonic Delta F = 1 Decays Beyond the Standard Model

Andrzej J. Buras, Jennifer Girrbach

摘要:

在标准模型树层次的各种扩展中,强子的非轻子衰变得到了新的重规范玻色子和标量的贡献。突出的例子是左右对称模型中的右手W'玻色子和具有扩展标量扇区的模型中的带电希格斯(H^ \pm)粒子,如双希格斯模型和超对称模型。即使在涉及四种不同夸克味的衰变的情况下,企鹅算符不能起作用,也必须考虑二十个线性无关的算符,而不是SM中的两个。预期的重要作用,这种衰变在LHCb,KEKB和Super-B在罗马,并考虑到未来改进的晶格计算,我们完成了现有的NLO QCD公式为这些过程计算O(alpha_s)的修正,以匹配条件的所有贡献运营商的Wilson系数在NDR- \bar{MS}计划。这允许减少现有NLO计算中的某些非物理尺度和重整化方案依赖性。我们的研究结果也可以应用到模型与树级重中性规范玻色子和标量交换三角洲F = 1过渡,并构成非线性光学分析的重要组成部分,这些非轻子衰变,企鹅运营商也作出贡献。

英文摘要:

In various extensions of the Standard Model (SM) tree level non-leptonic decays of hadrons receive contributions from new heavy gauge bosons and scalars. Prominent examples are the right-handed W' bosons in left-right symmetric models and charged Higgs (H^\pm) particles in models with extended scalar sector like two Higgs doublet models and supersymmetric models. Even in the case of decays with four different quark flavours involved, to which penguin operators cannot contribute, twenty linearly independent operators, instead of two in the SM, have to be considered. Anticipating the important role of such decays at the LHCb, KEKB and Super-B in Rome and having in mind future improved lattice computations, we complete the existing NLO QCD formulae for these processes by calculating O(alpha_s) corrections to matching conditions for the Wilson coefficients of all contributing operators in the NDR-\bar{MS} scheme. This allows to reduce certain unphysical scale and renormalization scheme dependences in the existing NLO calculations. Our results can also be applied to models with tree-level heavy neutral gauge boson and scalar exchanges in Delta F = 1 transitions and constitute an important part of NLO analyses of those non-leptonic decays to which also penguin operators contribute.

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