八种口味的物理学
The physics of eight flavours
摘要：
当QCD的味含量充分增加时，该理论发展出一个非平凡的红外不动点。因此，对于一些超过某个临界值的味，但还没有高到失去渐近自由，QCD成为一个共形场论。这个共形窗口的下限的位置尚未明确确定。利用改进的格点作用量，并利用现代算法允许更大的格点和更低的夸克质量，我们已经表明，八味QCD理论打破了连续统中的手征对称性。我们提出的证据表明，伴随的过渡是热的性质，因此，保形窗口的QCD只能开始后，证实最近的分析研究，在旧的结果为代价。
英文摘要：
When the flavour content of QCD is increased sufficiently, the theory develops a non-trivial infra red fixed point. Thus, for a number of flavours above a certain critical value, but not yet so high that asymptotic freedom is lost, QCD becomes a conformal field theory. The location of the lower limit of this conformal window has not yet been unequivocally determined. Using an improved lattice action, and exploiting modern algorithms allowing for larger lattices and lower quark masses, we have shown that the theory of QCD with eight flavours breaks chiral symmetry in the continuum. We present proof that the accompanying transition is thermal in nature and as a consequence, the conformal window of QCD can only start afterwards, corroborating recent analytical studies at the expense of older results.
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