Kobayashi-Maskawa Institute for the Origin of Particles and the Universe (KMI), Nagoya University, Nagoya 464-8602, Japan.
Phys Rev Lett. 2013 Oct 18;111(16):162001. doi: 10.1103/PhysRevLett.111.162001. Epub 2013 Oct 14.
On the basis of lattice simulations using highly improved staggered quarks for twelve-flavor QCD with several bare fermion masses, we observe a flavor-singlet scalar state lighter than the pion in the correlators of fermionic interpolating operators. The same state is also investigated using correlators of gluonic interpolating operators. Combined with our previous study that showed twelve-flavor QCD to be consistent with being in the conformal window, we infer that the lightness of the scalar state is due to infrared conformality. This result shed some light on the possibility of a light composite Higgs boson ("technidilaton") in walking technicolor theories.
在使用高度改进的交错夸克对十二夸克 QCD 进行晶格模拟的基础上，我们在费米子内插算符的关联函数中观察到了比介子轻的味单标量态。我们还使用胶子内插算符的关联函数研究了同一态。结合我们之前的研究表明十二夸克 QCD 符合共形窗口，我们推断标量态的轻质量是由于红外共形性。这一结果为步行手征色动力学理论中的轻复合希格斯玻色子（“technidilaton”）的可能性提供了一些线索。
