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arXiv 0812.1467hep-lat
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SU(2)具有两个伴随Dirac味的格点规范理论的谱

Spectrum of SU(2) lattice gauge theory with two adjoint Dirac flavours

Ari J. Hietanen, Jarno Rantaharju, Kari Rummukainen, Kimmo Tuominen

摘要:

在规范群的伴随表象下变换的两个费米子的SU(2)规范理论在红外线上可能呈现共形或几乎共形。我们使用晶格模拟来研究这个理论的频谱和目前的结果上的质量的几个规范单重态作为一个函数的物理夸克质量确定通过轴向沃德恒等式和发现的迹象的变化从手征对称性破缺相一致的共形行为在beta_L ~ 2。然而,光谱的测量并不足以决定性地证实共形不动点的存在,在这个理论中,我们通过比较与基本费米子的类似测量。基于这些结果,我们勾勒出一个可能的相图,这种晶格理论和讨论的适用性和重要性,这些结果的未来测量的演变的耦合常数。

英文摘要:

An SU(2) gauge theory with two fermions transforming under the adjoint representation of the gauge group may appear conformal or almost conformal in the infrared. We use lattice simulations to study the spectrum of this theory and present results on the masses of several gauge singlet states as a function of the physical quark mass determined through the axial Ward identity and find indications of a change from chiral symmetry breaking to a phase consistent with conformal behaviour at beta_L ~ 2. However, the measurement of the spectrum is not alone sufficient to decisively confirm the existence of conformal fixed point in this theory as we show by comparing to similar measurements with fundamental fermions. Based on the results we sketch a possible phase diagram of this lattice theory and discuss the applicability and importance of these results for the future measurement of the evolution of the coupling constant.

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