The magnetic field modifies the pion-quark vertex in the Linear Sigma Model; a tree-level modification vanishes after summing Landau levels, and the claimed one-loop LLL identity between Ritus and Schwinger methods fails as displayed.
Kouveliotouet al., Nature393, 235 (1998)
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Magnetic field modifications to the pion-quark vertex in the Linear Sigma Model with quarks
The magnetic field modifies the pion-quark vertex in the Linear Sigma Model; a tree-level modification vanishes after summing Landau levels, and the claimed one-loop LLL identity between Ritus and Schwinger methods fails as displayed.