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arXiv 0810.0161hep-lat
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具有单夸克味的QCD的强子谱

Hadron spectrum of QCD with one quark flavor

F. Farchioni, I. Montvay, G. Münster, E. E. Scholz, T. Sudmann, J. Wuilloud

摘要:

介绍了一个正在进行的单夸克味QCD晶格模拟项目的最新结果。规范场采用Symanzik树级改进的Wilson作用量,费米子场采用(未改进的)Wilson作用量。从新的模拟与一个步骤的Stout涂抹(ρ =0.15)的费米子行动的结果进行了讨论。在16^3x32和24^3x48格子上,用多项式混合蒙特卡罗算法(PHMC)在β =4.0对应于a = 0.13fm时模拟了单味理论;盒子大小分别为L = 2.1fm和L = 3.1fm。在最轻的模拟夸克质量下,(部分淬灭的)π介子质量约为300 MeV。计算了最轻束缚态的质量,包括味单重标量和赝标量介子sigma_s和eta_s,标量胶球0^++和Delta^++重子。本文讨论了超对称性在质谱中的残余,这是由N_c与N=1超对称杨-米尔斯理论的大N_c方向折叠等价所引起的。

英文摘要:

The latest results of an ongoing project for the lattice simulation of QCD with a single quark flavor are presented. The Symanzik tree-level-improved Wilson action is adopted in the gauge sector and the (unimproved) Wilson action for the fermion. Results from new simulations with one step of Stout-smearing (rho=0.15) in the fermion action are discussed. The one-flavor theory is simulated by a polynomial hybrid Monte Carlo algorithm (PHMC) at beta=4.0 corresponding to a = 0.13fm, on 16^3x32 and 24^3x48 lattices; the box-size is L = 2.1fm and L = 3.1fm, respectively. At the lightest simulated quark mass the (partially quenched) pion mass is ~300 MeV. The masses of the lightest bound states are computed, including the flavor singlet scalar and pseudoscalar mesons sigma_s and eta_s, the scalar glueball 0^++, and the Delta^++ baryon. Relics of SUSY in the mass spectrum, expected from a large N_c orientifold equivalence with the N=1 supersymmetric Yang-Mills theory, are discussed.

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