Glueball spectrum from N-f=2 lattice QCD study on anisotropic lattices

doi:10.1088/1674-1137/42/9/093103

	Glueball spectrum from N-f=2 lattice QCD study on anisotropic lattices
	CLQCD Collaboration
刊名	CHINESE PHYSICS C
	2018
卷号	42 期号:9 页码:93103
关键词	glueball pseudoscalar meson topological charge density
ISSN号	1674-1137
DOI	10.1088/1674-1137/42/9/093103
文献子类	Article
英文摘要	The lowest-lying glueballs are investigated in lattice QCD using N-f = 2 clover Wilson fermions on anisotropic lattices. We simulate at two different and relatively heavy quark masses, corresponding to physical pion masses of m(pi) similar to 938 MeV and 650 MeV. The quark mass dependence of the glueball masses has not been investigated in the present study. Only the gluonic operators built from Wilson loops are utilized in calculating the corresponding correlation functions. In the tensor channel, we obtain the ground state mass to be 2.363(39) GeV and 2.384(67) GeV at m(pi) similar to 938 MeV and 650 MeV, respectively. In the pseudoscalar channel, when using the gluonic operator whose continuum limit has the form of c(ijk)TrB(i)D(j)B(k), we obtain the ground state mass to be 2.573(55) GeV and 2.585(65) GeV at the two pion masses. These results are compatible with the corresponding results in the quenched approximation. In contrast, if we use the topological charge density as field operators for the pseudoscalar, the masses of the lowest state are much lighter (around 1 GeV) and compatible with the expected masses of the flavor singlet q (q) over bar meson. This indicates that the operator c(ijk)TrB(i)D(j)B(k) and the topological charge density couple rather differently to the glueball states and q (q) over bar mesons. The observation of the light flavor singlet pseudoscalar meson can be viewed as the manifestation of effects of dynamical quarks. In the scalar channel, the ground state masses extracted from the correlation functions of gluonic operators are determined to be around 1.4-1.5 GeV, which is close to the ground state masses from the correlation functions of the quark bilinear operators. In all cases, the mixing between glueballs and conventional mesons remains to be further clarified in the future.
电子版国际标准刊号	2058-6132
WOS关键词	BOUND-STATES ; GLUONS ; U(1)
WOS研究方向	Physics
语种	英语
CSCD记录号	CSCD:6315231
WOS记录号	WOS:000442649300003
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/286239]
专题	高能物理研究所_理论物理室
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	CLQCD Collaboration. Glueball spectrum from N-f=2 lattice QCD study on anisotropic lattices[J]. CHINESE PHYSICS C,2018,42(9):93103.
APA	CLQCD Collaboration.(2018).Glueball spectrum from N-f=2 lattice QCD study on anisotropic lattices.CHINESE PHYSICS C,42(9),93103.
MLA	CLQCD Collaboration."Glueball spectrum from N-f=2 lattice QCD study on anisotropic lattices".CHINESE PHYSICS C 42.9(2018):93103.