十二味QCD的胶子观测量和标量谱
Gluonic observables and the scalar spectrum of twelve-flavour QCD
摘要：
我们在十二味QCD中测量了胶球质量和弦张力，旨在比较新出现的胶子谱和介子谱。当接近零夸克质量的临界面时，光谱中不同扇区的质量等级给出了一个新的处理方法来确定红外固定点的存在。我们描述了我们的胶子测量的细节，并在大量的规范配置与HISQ行动产生的结果。特别是，我们专注于标量胶球和它的味道单重态的费米态，这是轻于赝标量（可能是π介子）状态的混合。考虑到在行走的人工色理论中的轻复合希格斯玻色子，结果是有趣的。
英文摘要：
We measure glueball masses and the string tension in twelve-flavour QCD, aiming at comparing the emerging gluonic spectrum to the mesonic one. When approaching the critical surface at zero quark mass, the hierarchy of masses in the different sectors of the spectrum gives a new handle to determine the existence of an infrared fixed point. We describe the details of our gluonic measurements and the results obtained on a large number of gauge configurations generated with the HISQ action. In particular, we focus on the scalar glueball and its mixing with a flavour-singlet fermionic state, which is lighter than the pseudoscalar (would-be pion) state. The results are interesting in view of a light composite Higgs boson in walking technicolor theories.
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