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

文献类型：期刊论文

作者CLQCD Collaboration
刊名CHINESE PHYSICS C
出版日期2018
卷号42期号:9页码:93103
关键词glueball pseudoscalar meson topological charge density
ISSN号1674-1137
DOI10.1088/1674-1137/42/9/093103
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
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.

入库方式： OAI收割

来源：高能物理研究所

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