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arXiv 1606.06175hep-phhep-exhep-lat
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QCD耦合和强子$τ$衰变的图式变化

Scheme variations of the QCD coupling and hadronic $τ$ decays

Diogo Boito, Matthias Jamin, Ramon Miravitllas

摘要:

量子色动力学(QCD)耦合,$α_s$,是不是一个物理观测的理论,因为它依赖于公约有关的重整化过程。我们引入了QCD耦合的定义,记为$\hatα_s$,它的运行是显式重整化方案不变的。新的耦合$\hatα_s$的方案依赖性由一个单一的参数$C$参数化,与QCD尺度$Λ$的转换。它表明,适当的选择$C$可以导致物理观测量的微扰预测的实质性改善。作为唯象应用,我们研究了$e^+e^-$散射和$τ$轻子衰变为强子的过程,这两个过程都受QCD Adler函数的支配。

英文摘要:

The Quantum Chromodynamics (QCD) coupling, $α_s$, is not a physical observable of the theory since it depends on conventions related to the renormalization procedure. We introduce a definition of the QCD coupling, denoted by $\hatα_s$, whose running is explicitly renormalization scheme invariant. The scheme dependence of the new coupling $\hatα_s$ is parameterized by a single parameter $C$, related to transformations of the QCD scale $Λ$. It is demonstrated that appropriate choices of $C$ can lead to substantial improvements in the perturbative prediction of physical observables. As phenomenological applications, we study $e^+e^-$ scattering and decays of the $τ$ lepton into hadrons, both being governed by the QCD Adler function.

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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