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arXiv 1503.06177hep-th
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大N标量$QCD_{2}$在光阵面和自发对称性破缺上的哈密顿量、路径积分和BRST公式

Hamiltonian, Path Integral and BRST Formulations of Large N Scalar $QCD_{2}$ on the Light-Front and Spontaneous Symmetry Breaking

Usha Kulshreshtha, Daya Shankar Kulshreshtha, James P. Vary

摘要:

最近Grinstein,Jora和Polosa研究了一个单时空维的大$N$标量量子色动力学理论。这个理论承认一个描述夸克-反夸克束缚态离散谱的Bethe-Salpeter方程。他们认为规范场的伴随表示的$SU(N)$和标量场的基本表示。该理论是渐近自由和线性限制的。该理论可能为描述一大类双夸克-反双夸克(四夸克)态提供一个很好的场论框架。最近,我们研究了没有希格斯势的这个理论的光阵面量子化。在本工作中,我们研究了Higgs势存在下该理论的光阵面哈密顿量、路径积分和BRST公式。光阵面理论被认为是规范不变的,拥有一组第一类约束。该理论中自发对称性破缺的显式发生在幺正规范和光前t Hooft规范中。

英文摘要:

Recently Grinstein, Jora, and Polosa have studied a theory of large-$N$ scalar quantum chromodynamics in one-space one-time dimension. This theory admits a Bethe-Salpeter equation describing the discrete spectrum of quark-antiquark bound states. They consider gauge fields in the adjoint representation of $SU(N)$ and scalar fields in the fundamental representation. The theory is asymptotically free and linearly confining. The theory could possibly provide a good field theoretic framework for the description of a large class of diquark-antidiquark (tetra-quark) states. Recently we have studied the light-front quantization of this theory without a Higgs potential. In the present work, we study the light-front Hamiltonian, path integral and BRST formulations of the theory in the presence of a Higgs potential. The light-front theory is seen to be gauge-invariant, possessing a set of first-class constraints. The explicit occurrence of spontaneous symmetry breaking in the theory is shown in unitary gauge as well as in the light-front 't Hooft gauge.

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