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arXiv 2007.05584hep-ph
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微扰-抑制的QCD耦合和强子对μ介子g-2的贡献

Infrared-suppressed QCD coupling and the hadronic contribution to muon g-2

Gorazd Cvetic, Reinhart Kogerler

摘要:

一个变种的QCD的耦合抑制在红外(IR)制度,建议由大体积格点计算的朗道规范胶子和鬼敷料功能,被认为是。在高动量区,耦合还受到与微扰QCD近似符合条件的限制,在中动量区,耦合还受到由重正马龙激发的重正化方法计算的$τ$ -轻子半强子衰变率的限制。得到的耦合原来是免费的朗道奇点。然后,对$τ$ -衰变的OPAL和ALEPH(V+A)道数据应用Borel求和规则提取Adler函数的$D=4,6$凝聚值,并推导出相应的V道凝聚值。然后,我们表明,正确的值的强子真空极化贡献的μ子异常磁矩,$a_μ^{\rm had(1)}$,是通过正规化的$D=4,6$ OPE项的V通道Adler函数与IR正则化质量${\cal M}_{D/2} \lesssim 1 \ {\rm GeV}$再现,这表明内部的QCD框架的一致性。

英文摘要:

A variant of QCD with the coupling suppressed in the infrared (IR) regime, as suggested by large-volume lattice calculations of the Landau-gauge gluon and ghost dressing functions, is considered. The coupling is further restricted by the condition of approximate coincidence with perturbative QCD in the high momentum regime, and by the $τ$-lepton semihadronic decay rate in the intermediate momentum regime, the rate which is evaluated by a renormalon-motivated resummation method. The obtained coupling turns out to be free of Landau singularities. The $D=4,6$ condensate values of the Adler function are then extracted by application of the Borel sum rules to the OPAL and ALEPH (V+A)-channel data of $τ$-decay, and the corresponding V-channel condensate values are deduced as well. We then show that the correct value of the hadronic vacuum polarization contribution to the muon anomalous magnetic moment, $a_μ^{\rm had(1)}$, is reproduced by regularizing the $D=4,6$ OPE terms in the V-channel Adler function with IR-regularization masses ${\cal M}_{D/2} \lesssim 1 \ {\rm GeV}$, suggesting the internal consistency of the presented QCD framework.

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