Nambu-Goldstone mesons in strong magnetic field
Abstract
We study the q q structure embedded in chiral mesons in response to external magnetic fields, using the chiral Lagrangian with q q degrees of freedom derived earlier. We show that GMOR relations hold true for neutral chiral mesons, while they are violated for the charged ones for eB>sigma=0.2 GeV2. The standard chiral perturbation theory also fails in this region. Masses of pi+ and pi0 mesons are calculated and compared to lattice data.
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