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arXiv 1111.2319hep-lat
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六重夸克态QCD的手征相变

The chiral phase transition for QCD with sextet quarks

D. K. Sinclair, J. B. Kogut

摘要:

本文研究了具有两个无质量色六重夸克的QCD作为一个行走的人工色模型。我们在有限温度下模拟了两个浅色六重态交错夸克的格点量子色动力学,利用手征跃迁时的耦合对晶格时间尺度$N_t$的依赖关系,研究了裸晶格耦合随晶格间距的变化.我们的目标是确定这个理论是否是类QCD和“行走”,或者如果它是共形的。如果它是类QCD的,则手征跃迁处的耦合应该以受渐近自由控制的方式,即受微扰$β$ -函数控制的方式,作为$N_t \rightarrow \infty$趋于零。另一方面,如果该理论是共形的,则该耦合将接近$N_t \rightarrow \infty$极限中的非零极限。我们正在扩展我们的$N_t=8$晶格上的模拟,以确定更准确的手性过渡的位置,并正在进行模拟的$N_t=12$晶格。

英文摘要:

QCD with 2 massless colour-sextet quarks is studied as a model of Walking Technicolor. We simulate lattice QCD with 2 light color-sextet staggered quarks at finite temperature, and use the dependence of the coupling at the chiral transition on the temporal extent, $N_t$, of the lattice in lattice units to study the running of the bare lattice coupling with lattice spacing. Our goal is to determine whether this theory is QCD-like and `walks', or if it is conformal. If it is QCD-like, the coupling at the chiral transition should tend to zero as $N_t \rightarrow \infty$ in a manner controlled by asymptotic freedom, i.e. by the perturbative $β$-function. On the other hand, if this theory is conformal, this coupling will approach a non-zero limit in the $N_t \rightarrow \infty$ limit. We are extending our simulations on an $N_t=8$ lattice to determine the position of the chiral transition with greater accuracy, and are performing simulations on an $N_t=12$ lattice.

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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