Abstract
We review the Hadronic Paschen-Back effect in charmonium systems, which is a new phenomenon caused when hadrons with finite orbital angular momenta are exposed to a strong magnetic field. The mass spectra, shapes of wave functions, and mixing ratios are numerically evaluated by the constituent quark models with a magnetic field and the cylindrical Gaussian expansion method. As a detectable effect, we discuss anisotropic quarkonium decays induced from the wave function deformation. Such decays would be useful to measure the strength of the magnetic field in high-energy heavy-ion collisions at LHC and RHIC, which has not been measured experimentally.
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