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Decayηb→J/ψJ/ψin light cone formalism
Physical Review D
The decays of pseudoscalar bottomonium eta_b into a pair of vector charmonia, J/\psi J/\psi, J/\psi \psi', \psi' \psi' are considered in the light cone formalism. Relativistic and leading logarithmic radiative corrections to the amplitudes of these processes are resummed. It is shown that the small value for the branching ratio of the decay eta_b-> J/\psi J/\psi obtained within the leading order nonrelativistic QCD is a consequence of a fine-tuning between certain parameters, which is brokendoi:10.1103/physrevd.81.014012 fatcat:weuwoy3zxvfvnatrknermnnh7u