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arXiv 1111.1886hep-phhep-lat
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类QCD理论中的两点函数和S参数

Two-Point Functions and S-Parameter in QCD-like Theories

Johan Bijnens, Jie Lu

摘要:

我们计算了低能有效场论中三种不同的类QCD理论的矢量、轴矢量、标量和赝标量两点函数,直到两圈水平。此外,我们还计算了赝标衰变常数$G_M$。我们使用的类QCD理论是那些费米子在一个复杂的,真实的或伪真实的表示一般n味道。这些情况对应于$SU(n)_L\times SU(n)_R\to SU(n)_V$、$SU(2n)\to SO(2n)$或$SU(2n)\to Sp(2n)$的全局对称性破缺模式。我们还估计了这些不同理论的S参数。

英文摘要:

We calculated the vector, axial-vector, scalar and pseudo-scalar two-point functions up to two-loop level in the low-energy effective field theory for three different QCD-like theories. In addition we also calculated the pseudo-scalar decay constant $G_M$. The QCD-like theories we used are those with fermions in a complex, real or pseudo-real representation with in general n flavours. These case correspond to global symmetry breaking pattern of $SU(n)_L\times SU(n)_R\to SU(n)_V$, $SU(2n)\to SO(2n)$ or $SU(2n)\to Sp(2n)$. We also estimated the S parameter for those different theories.

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