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arXiv · 1711.00711

Glueball relevant study on isoscalars from $N_f=2$ lattice QCD

Wei Sun·Long-cheng Gui·Ying Chen·Ming Gong·Zhaofeng Liu
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Abstract

We perform a glueball-relevant study on isoscalars based on anisotropic $N_f=2$ 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 $q\bar{q}$ operator is included, we find the mass of this state does not change, and the $q\bar{q}$ 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 $q\bar{q}$ state $\eta_2$ (or $\eta'$ 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.

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Wei Sun, Long-cheng Gui, Ying Chen, Ming Gong, Zhaofeng Liu. 2017-11-02. Glueball relevant study on isoscalars from $N_f=2$ lattice QCD. https://doi.org/10.1051/epjconf%2F201817505016

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