https://doi.org/10.1051/epjconf/201817505016
Glueball relevant study on isoscalars from Nf = 2 lattice QCD
1
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, P.R. China
2
School of Physics, University of Chinese Academy of Sciences, Beijing 100049, P.R. China
3
Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal University, Changsha 410081, P.R. China
4
Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Changsha 410081, P.R. China
* Speaker, e-mail: sunw@ihep.ac.cn
Published online: 26 March 2018
Abstract.We perform a glueball-relevant study on isoscalars based on anisotropic Nf = 2 lattice QCD gauge configurations. In the scalar channel, we identify the ground state obtained through gluonic operators to be a single-particle state through its dispersion relation. When qq operator is included, we find the mass of this state does not change, and the qq operator couples very weakly to this state. So this state is most likely a glueball state. For pseudoscalars, along with the exiting lattice results, our study implies that both the conventional qq state η2 (or η' in flavor SU(3)) and a heavier glueball-like state with a mass of roughly 2.6 GeV exist in the spectrum of lattice QCD with dynamical quarks.
© The Authors, published by EDP Sciences, 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (http://creativecommons.org/licenses/by/4.0/).
