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Isoscalar mesons upon unbreaking of chiral symmetry
- Source :
- Phys. Rev. D 91 (2015) 034505
- Publication Year :
- 2014
-
Abstract
- In a dynamical lattice simulation with the overlap Dirac operator and $N_f=2$ mass degenerate quarks we study all possible $J=0$ and $J=1$ correlators upon exclusion of the low lying "quasi-zero" modes from the valence quark propagators. After subtraction of a small amount of such Dirac eigenmodes all disconnected contributions vanish and all possible point-to-point $J=0$ correlators with different quantum numbers become identical, signaling a restoration of the $SU(2)_L \times SU(2)_R \times U(1)_A$. The original ground state of the $\pi$ meson does not survive this truncation, however. In contrast, in the $I=0$ and $I=1$ channels for the $J=1$ correlators the ground states have a very clean exponential decay. All possible chiral multiplets for the $J=1$ mesons become degenerate, indicating a restoration of an $SU(4)$ symmetry of the dynamical QCD-like string.<br />Comment: 10 pages, 13 figures
- Subjects :
- High Energy Physics - Lattice
High Energy Physics - Phenomenology
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. D 91 (2015) 034505
- Publication Type :
- Report
- Accession number :
- edsarx.1410.8751
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevD.91.034505