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arXiv 1104.1576hep-thhep-phmath-phmath.MP
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SU(2)空间常数夸克和胶子场的Dirac-Yang-Mills量子力学

SU(2) Dirac-Yang-Mills quantum mechanics of spatially constant quark and gluon fields

H. -P. Pavel

摘要:

研究了空间常数SU(2)Yang-Mills场和Dirac场的最小耦合量子力学,作为双色QCD的强耦合极限.利用正则变换的夸克和胶子场,阿贝尔高斯定律的约束来实现,相应的无约束的哈密顿量和总角动量推导。这就像把有色的自旋1胶子还原成无约束的无色自旋0和自旋2胶子一样,把有色的自旋1/2夸克还原成无约束的无色自旋0和自旋1夸克。然而,这些仍然满足反对易关系,因此满足保利不相容原理。然后将得到的无约束哈密顿量改写成一种形式,它将转动自由度和标量自由度分开。在这种形式中,可以以高精度获得低能谱。作为一个说明性的例子,计算了一种味的无质量夸克的夸克-胶子系统的自旋0能谱。发现只有在满足粒子-反粒子C对称边界条件的4个约化夸克(半填充)的情况下,才能得到能量比纯胶子低的态。这些是基态,其能量比纯胶子的情况低20%左右,并形成夸克凝聚体,而σ-反σ激发的能量约为第一个胶球激发的五分之一。

英文摘要:

The quantum mechanics of spatially constant SU(2) Yang-Mills- and Dirac-fields minimally coupled to each other is investigated as the strong coupling limit of 2-color-QCD. Using a canonical transformation of the quark and gluon fields, which Abelianises the Gauss law constraints to be implemented, the corresponding unconstrained Hamiltonian and total angular momentum are derived. In the same way as this reduces the colored spin-1 gluons to unconstrained colorless spin-0 and spin-2 gluons, it reduces the colored spin-1/2 quarks to unconstrained colorless spin-0 and spin-1 quarks. These however continue to satisfy anti-commutation relations and hence the Pauli-exclusion principle. The obtained unconstrained Hamiltonian is then rewritten into a form, which separates the rotational from the scalar degrees of freedom. In this form the low-energy spectrum can be obtained with high accuracy. As an illustrative example, the spin-0 energy-spectrum of the quark-gluon system is calculated for massless quarks of one flavor. It is found, that only for the case of 4 reduced quarks (half-filling) satisfying the boundary condition of particle-antiparticle C-symmetry, states with energy lower than for the pure-gluon case are obtained. These are the groundstate, with an energy about 20% lower than for the pure-gluon case and the formation of a quark condensate, and the sigma-antisigma excitation with an energy about a fifth of that of the first glueball excitation.

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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