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arXiv 1301.2646hep-lathep-ph
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SU(3)最大阿贝尔规范中胶子传播子的格点量子色动力学研究:非对角胶子质量产生和红外阿贝尔优势

SU(3) lattice QCD study of the gluon propagator in maximally Abelian gauge: off-diagonal gluon mass generation and infrared Abelian dominance

Shinya Gongyo, Hideo Suganuma, Takumi Iritani

摘要:

研究了SU(3)格点量子色动力学中U(1)$_3 \times$ U(1)$_8$ Landau规范固定MA规范中胶子传播子和胶子场的有效质量.在猝灭水平下,在$β$ =5.7、5.8和6.0下对$16^4$以及在$β=$ 5.8和6.0下对$32^4$进行蒙特卡罗模拟。为了计算传播子,我们采用了一种从SU(3)情形的连接变量中解析地提取规范场的方法。非对角胶子在$r = 0.3 - 0.8 {\rm fm}$区域表现为有效质量近似为$M_{\rm off} \simeq 1.1 - 1.2 {\rm GeV}$的大质量矢量玻色子,传播被限制在很短的范围内.另一方面,对角胶子的行为与$M_{\rm diag}\simeq 0.3 {\rm GeV} $的光矢量玻色子和对角胶子的传播保持甚至在一个大的范围。通过这种方式,红外阿贝尔优势显示在非对角胶子的短程传播方面。此外,我们还研究了非对角胶子传播子的泛函形式。该函数的形式可以用四维欧几里得Yukawa型函数${\rm exp}(-m_{\rm off} r)/r$很好地描述,其中$r = 0.1- 0.8{\rm fm}$具有$m_{\rm off} = 1.3 -1.4 {\rm GeV}$。这也表明非对角胶子的谱函数存在负值区。

英文摘要:

We investigate gluon propagators and the effective mass of the gluon fields in the MA gauge with U(1)$_3 \times$ U(1)$_8$ Landau gauge fixing in SU(3) lattice QCD. The Monte Carlo simulation is performed on $16^4$ at $β$=5.7, 5.8 and 6.0 and $32^4$ at $β=$5.8 and 6.0 at the quenched level. To calculate the propagators, we adopt a method to extract gauge fields from link-variables analytically in the SU(3) case. The off-diagonal gluons behave as massive vector bosons with the approximate effective mass $M_{\rm off} \simeq 1.1 - 1.2 {\rm GeV}$ in the region of $r = 0.3 - 0.8 {\rm fm}$, and the propagation is limited within a short range. On the other hand, the diagonal gluons behave as light vector bosons with $M_{\rm diag}\simeq 0.3 {\rm GeV} $ and the propagation of diagonal gluons remains even in a large range. In this way, infrared Abelian dominance is shown in terms of short-range propagation of off-diagonal gluons. Furthermore, we investigate the functional form of the off-diagonal gluon propagator. The functional form is well described by the four-dimensional Euclidean Yukawa-type function ${\rm exp}(-m_{\rm off} r)/r$ with $m_{\rm off} = 1.3 -1.4 {\rm GeV}$ for $r = 0.1- 0.8{\rm fm}$. This also indicates that the spectral function of off-diagonal gluons has the negative-value region.

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