Chiral and $U(1{)}_A$ symmetries in background magnetic fields from lattice QCD

Heng-Tong Ding, José Javier Hernández Hernández, Dan Zhang

We study chiral symmetry and singlet $U(1{)}_A$ symmetry in QCD in a background magnetic field using lattice QCD. We first clarify the neutral-sector symmetry structure in a pure mag…