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arXiv 1004.4987hep-ph
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QCD求和规则中的夹权与对偶破坏:一个批判性分析

Pinched weights and Duality Violation in QCD Sum Rules: a critical analysis

Martin Gonzalez-Alonso, Antonio Pich, Joaquim Prades

摘要:

我们分析了所谓的箍缩权重,这通常被认为是减少违反夸克-强子对偶性的能量求和规则。在展示了这在一般情况下是不正确的之后,我们解释了如何利用我们以前的工作[1]来解决LR相关器和任何特定捏权的这个问题,其中研究了LR谱函数的可能的高能行为。特别地,我们表明,使用箍缩重量可以高精度地确定算子乘积展开中的6维和8维贡献,O 6 =(-4.3 ^[+0.9}_{-0.7})*10^-3 GeV^6和O 8 =(-7.2 ^{+4.2}_{-5.3})*10^-3 GeV^8。

英文摘要:

We analyze the so-called pinched weights, that are generally thought to reduce the violation of quark-hadron duality in Finite-Energy Sum Rules. After showing how this is not true in general, we explain how to address this question for the LR correlator and any particular pinched weight taking advantage of our previous work [1], where the possible high-energy behavior of the LR spectral function was studied. In particular we show that the use of pinched weights allows to determine with high accuracy the dimension six and eight contributions in the operator product expansion, O6=(-4.3^[+0.9}_{-0.7})*10^-3 GeV^6 and O8=(-7.2^{+4.2}_{-5.3})*10^-3 GeV^8.

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