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arXiv 1405.4752hep-lathep-ph
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SU中八种畴壁费米子的晶格模拟(3)规范理论

Lattice simulations with eight flavors of domain wall fermions in SU(3) gauge theory

T. Appelquist, R. C. Brower, G. T. Fleming, J. Kiskis, M. F. Lin, E. T. Neil, J. C. Osborn, C. Rebbi, E. Rinaldi, D. Schaich, C. Schroeder, S. Syritsyn, G. Voro… 展开作者

T. Appelquist, R. C. Brower, G. T. Fleming, J. Kiskis, M. F. Lin, E. T. Neil, J. C. Osborn, C. Rebbi, E. Rinaldi, D. Schaich, C. Schroeder, S. Syritsyn, G. Voronov, P. Vranas, E. Weinberg, O. Witzel

摘要:

本文研究了在基本表象下Nf = 8的轻费米子简并味的SU(3)规范理论。利用畴壁费米子公式,我们研究了轻强子谱、手征凝聚和电弱S参数。我们考虑一系列的光费米子质量的两个晶格体积在一个单一的规范耦合选择,使IR尺度近似匹配我们以前的研究的两个和六味系统。我们的结果为Nf = 8的光谱表明自发的手征对称性破缺,虽然适合费米子质量依赖的光谱量并不强烈反对质量变形红外保形性的假设。与Nf = 2相比,我们观察到手性凝聚相对于对称性破缺尺度F的显著增强,类似于Nf = 6的情况。减少的S参数,有关奇偶加倍的矢量和轴向矢量通道,也相当于我们的六味结果。

英文摘要:

We study an SU(3) gauge theory with Nf=8 degenerate flavors of light fermions in the fundamental representation. Using the domain wall fermion formulation, we investigate the light hadron spectrum, chiral condensate and electroweak S parameter. We consider a range of light fermion masses on two lattice volumes at a single gauge coupling chosen so that IR scales approximately match those from our previous studies of the two- and six-flavor systems. Our results for the Nf=8 spectrum suggest spontaneous chiral symmetry breaking, though fits to the fermion mass dependence of spectral quantities do not strongly disfavor the hypothesis of mass-deformed infrared conformality. Compared to Nf=2 we observe a significant enhancement of the chiral condensate relative to the symmetry breaking scale F, similar to the situation for Nf=6. The reduction of the S parameter, related to parity doubling in the vector and axial-vector channels, is also comparable to our six-flavor results.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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