Model-independent Study on Magnetic Dipole Transition in Heavy Quarkonium
Abstract
Some new results on magnetic dipole (M1) transitions in heavy quarkonium from nonrelativistic effective field theories of QCD are briefly reported. This model-independent approach not only facilitates a systematic and lucid way to investigate the relativistic corrections, it also clarifies some inconsistent treatment in previous potential model approach. The impact of our formalism on J/Psi -> etac gamma, Upsilon(Upsilon') -> etab gamma and hc -> chic0 gamma are discussed.
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