大N_c QCD中重子、四夸克态和胶球
Baryonium, tetra-quark state and glue-ball in large N_c QCD
摘要：
从大N_c QCD的观点出发，研究了重子态、四夸克态、杂化态和胶球。这些国家的存在是有争议的。它们由重子构成。在N_f=1的大N_c量子色动力学中，重子总是等同于具有N_c价胶子的胶球。基态0^{-+}胶球的质量约为2450 MeV。f_0（1710）被识别为最低0^{++}胶球。最低的四夸克九重态应该是f_0（1370），a_0（1450），K^*_0（1430）和f_0（1500）。结合重夸克有效理论，预测了重子态和重四夸克态的能谱。讨论了1/N_c修正。
英文摘要：
From the large-N_c QCD point of view, baryonia, tetra-quark states, hybrids, and glueballs are studied. The existence of these states is argued for. They are constructed from baryons. In N_f=1 large N_c QCD, a baryonium is always identical to a glueball with N_c valence gluons. The ground state 0^{-+} glueball has a mass about 2450 MeV. f_0(1710) is identified as the lowest 0^{++} glueball. The lowest four-quark nonet should be f_0(1370), a_0(1450), K^*_0(1430) and f_0(1500). Combining with the heavy quark effective theory, spectra of heavy baryonia and heavy tetra-quark states are predicted. 1/N_c corrections are discussed.
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