Trace anomaly and dynamical quark mass

Abstract

We investigated the origin of the RI'/MOM quark mass under the Landau gauge at the non-perturbative scale, using the chiral fermion with different quark masses and lattice spacings. Our result confirms that such a mass is non-vanishing based on the linear extrapolation to the chiral and continuum limit, and shows that such a mass comes from the spontaneous chiral symmetry breaking induced by the near zero modes with the eigenvalue $\lambda <\mathcal{O}(5m_q)$, and is proportional to the quark matrix element of the trace anomaly at least down to $\sim$1.3 GeV.

Comments: 7 pages, 5 figures; for the 37th International Symposium on Lattice Field Theory (Lattice2019), 16-22 June 2019, Wuhan, China